2010 Cadillac Truck SRX FWD V6-3.0L Page 1693

2010 Cadillac Truck SRX FWD V6-3.0L Page 1693

Diagnostic Fault Information

Typical Scan Tool Data

Circuit/System Description

The output speed sensor (OSS) is a hall-effect type sensor. The sensor faces the front differential transfer drive gear. The sensor receives 8.3-9.3

volts on the OSS supply voltage circuit from the transmission control module (TCM). As the output shaft rotates, the sensor produces a signal

frequency based on the machined surface of the output shaft. This signal is transmitted through the OSS signal circuit to the TCM. The TCM uses

the OSS signal to determine line pressure, transmission shift patterns, torque converter clutch (TCC) slip speed and gear ratio.

Conditions for Running the DTC

P0722

* No DTCs P0101, P0102, P0103, P0121, P0122, P0123, P0716, P0717, or P0723.

* The selected range is not PARK or NEUTRAL.

* The transmission input speed is between 1,000-6,500 RPM.

* The engine speed is between 3,200-5,000 RPM.

* The calc. throttle position is greater than 5 percent.

* The throttle position signal is valid.

* The engine torque is greater than 35 Nm (26 lb ft).

* The engine torque signal is valid.

* The TFT is greater than -40掳C (-40掳F).

* The engine speed is greater than 400 RPM for 5 seconds.

* The ignition voltage is 8.6 volts or greater.

P0723

* No DTCs P0101, P0102, P0103, P0121, P0122, P0123, P0723, P0973, P0974, P0976, P0977.

* Greater than 5 seconds since last range change.

* The engine speed is greater than 400 RPM for 5 seconds.

* The ignition voltage is greater than 8.6 volts.

Conditions for Setting the DTC

P0722

The transmission output speed is 70 RPM or less for 4.5 seconds.

P0723

* The transmission output speed is 210 RPM or greater for 0.2 second.

* The transmission output speed drops 650 RPM for greater than 1.5 seconds and does not recover.

Action Taken When the DTC Sets

* DTCs P0722 and P0723 are Type A DTCs.

* The TCM freezes transmission adaptive functions.

2010 Cadillac Truck SRX FWD V6-3.0L Page 1955

2010 Cadillac Truck SRX FWD V6-3.0L Page 1955

Diagnostic Fault Information

Typical Scan Tool Data

Circuit/System Description

The accelerator pedal assembly contains 2 accelerator pedal position (APP) sensors. The APP sensors are mounted to the accelerator pedal

assembly and are not serviceable. The APP sensors provide a signal voltage that changes relative to pedal position. The engine control module

(ECM) supplies each APP sensor with a 5-volt reference circuit, a low reference circuit, and a signal circuit.

Both the APP sensors 1 and 2 signal percentages increase as the pedal is depressed, from approximately 0 percent at rest to above 95 percent when

fully depressed.

Conditions for Running the DTC

P2122, P2123, P2127, or P2128

* DTC P06A3 or P0697 are not set.

* The ignition is ON or the engine is operating.

* The ignition voltage is greater than 6 volts.

* The ECM is not commanding reduced power.

* The DTCs run continuously when the above conditions are met.

P2138

* DTCs P06A3, P0697, P2122, P2123, P2127, or P2128 are not set.

* The ignition is ON or the engine is operating.

* The ignition voltage is greater than 6 volts.

* The ECM is not commanding reduced power.

* The DTC runs continuously when the above conditions are met.

Conditions for Setting the DTC

P2122

The ECM detects that the APP sensor 1 voltage is less than 0.46 volt for less than 1 s.

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2010 Cadillac Truck SRX FWD V6-3.0L Page 1842

Diagnostic Fault Information

Circuit/System Description

The shift solenoid (SS) 1 is part of the control solenoid valve assembly, which has no serviceable components. SS 1 is a normally closed (NC)

ON/OFF solenoid and is controlled by the TCM through a low side driver. When the SS 1 is energized (ON), SS 1 fluid pressure is directed to the

clutch select valve 2, which allows the valve to overcome the spring pressure and move to the applied position. Power to the SS 1 is supplied by the

TCM through a high side driver (HSD). The HSD protects the circuit and components from excessive current flow. If excessive current flow is

detected, the HSD will turn OFF. When the fault is corrected, the HSD will reset.

Conditions for Running the DTC

P0973

* The engine speed is greater than 400 RPM for 5 seconds.

* The ignition voltage is 8.6 volts or greater.

* DTC P0973 has not set this ignition cycle.

P0974

* The engine speed is greater than 400 RPM for 5 seconds.

* The ignition voltage is 8.6 volts or greater.

* DTC P0974 has not set this ignition cycle.

Conditions for Setting the DTC

P0973

The control solenoid valve assembly detects a short to ground on the SS 1 control circuit for 2 seconds.

P0974

The control solenoid valve assembly detects an open or a short to power on the SS 1 control circuit for 2 seconds.

Action Taken When the DTC Sets

P0973

* DTC P0973 is a Type A DTC.

* The TCM limits the transmission to reverse and 5th gear.

* The TCM inhibits torque converter clutch (TCC) engagement.

* The TCM commands maximum line pressure.

* The TCM freezes transmission adaptive functions.

* The TCM inhibits Tap Up/Down function.

* The TCM inhibits manual shifting of forward gears.

P0974

* DTC P0974 is a Type B DTC.

* The TCM inhibits 1st gear.

Conditions for Clearing the DIC/DTC

* DTC P0973 is a Type A DTC.

* DTC P0974 is a Type B DTC.

Reference Information

Connector End View Reference

* Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

* Inline Harness Connector End Views (See: Diagrams/Connector Views/Multiple Junction Connector/Connector End Views By Number)

Description and Operation

Transmission General Description (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and Operation/6T70/6T75 -

Automatic Transmission/Transmission General Description)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

2010 Cadillac CTS Sedan AWD V6-3.6L Page 376

2010 Cadillac CTS Sedan AWD V6-3.6L Page 376

Diagnostic Fault Information

Circuit/System Description

The theft deterrent module (TDM) monitors the battery positive (B+) voltage available to it. If the voltage at the TDM is between 6-9 V, and the

voltage being reported by a serial data message is greater than 9 V, then DTC B1424 00 sets.

Conditions for Running the DTC

* The Ignition is in Accessory or Run

* The diagnostic runs every 100 milliseconds.

Conditions for Setting the DTC

* Voltage at the B+ circuit is between 6 and 9 V.

* Reported battery voltage received via serial data is valid and is greater than 9 V.

* The above conditions have been met for 2 seconds.

Action Taken When the DTC Sets

* Security Indicator turns ON.

* The driver information center (DIC) displays the SERVICE THEFT DETERRENT SYSTEM message.

Conditions for Clearing the DTC

* This DTC passes when the battery voltage at the TDM is greater than 9 V, or if the voltage reported by serial data is less than 9 V.

* A history DTC clears after 100 consecutive ignition cycles, if no failures are reported by this diagnostic.

Diagnostic Aids

A low voltage DTC in multiple modules indicates a concern in the charging system.

Reference Information

Schematic Reference

Immobilizer Schematics (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Diagrams/Electrical Diagrams/Immobilizer

Schematics)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Immobilizer Description and Operation (without Y41) (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Description and

Operation/Immobilizer Description and Operation (Without Y41))Immobilizer Description and Operation (with Y41) (See: Accessories and

Optional Equipment/Antitheft and Alarm Systems/Description and Operation/Immobilizer Description and Operation (With Y41))

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Testing

1. Engine running, accessories OFF, measure and record the battery voltage at the battery terminals.The voltage should be between 12.6 and

15.0 V.

瀚慖f the battery voltage is not within the specified range, refer to Charging System Test (See: Starting and Charging/Testing and

Inspection/Component Tests and General Diagnostics/Charging System Test)

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2010 Cadillac CTS Sedan AWD V6-3.6L Page 611

Diagnostic Fault Information

Circuit/System Description

When the content theft deterrent (CTD) system arms and the inclination and intrusion sensors are enabled, the body control module (BCM) receives

a power-up acknowledgement from the sensors via the sensor signal circuit.

Conditions for Running the DTC

* The inclination and intrusion sensors are enabled

* The CTD system has armed

Conditions for Setting the DTC

The BCM does not receive the power-up acknowledgement from the inclination and intrusion sensors

Action Taken When the DTC Sets

The BCM will ignore all inputs from the inclination and intrusion sensors for the remainder of the CTD system arming cycle

Conditions for Clearing the DTC

A current DTC will clear when the BCM receives a power-up acknowledgement during the next CTD system arming cycle

Reference Information

Schematic Reference

Theft Deterrent System Schematics (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Diagrams/Electrical Diagrams/Theft

Deterrent System Schematics)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Content Theft Deterrent (CTD) Description and Operation (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Description

and Operation/Content Theft Deterrent (CTD) Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

Scan Tool Reference

Refer to Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the inclination sensor.

2. Verify a test lamp illuminates between the B+ circuit terminal 1 and ground.

瀚慖f the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

3. Disconnect the harness connector at the intrusion sensor.

4. Verify a test lamp illuminates between the B+ circuit terminal A and ground.

瀚慖f the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

5. Ignition OFF, disconnect the harness connector at the intrusion sensor.

6. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal A and ground.

瀚慖f the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

2010 Cadillac CTS Sedan AWD V6-3.6L Page 711

2010 Cadillac CTS Sedan AWD V6-3.6L Page 711

Diagnostic Fault Information

Circuit/System Description

The rear axle differential temperature sensor is a two wire sensor that is a variable resistor type. It is used by the instrument panel cluster (IPC) to

monitor the temperature of the rear axle. The IPC provides a 5 volt reference and receives a signal voltage from the sensor which is mounted on the

rear differential housing.

Conditions for Running the DTC

Ignition ON

Conditions for Setting the DTC

The IPC detects signal voltage less than 0.1 V or greater than 5 V for 60 seconds.

Action Taken When the DTC Sets

The SERVICE DIFFERENTIAL SENSOR message is displayed on the IPC.

Conditions for Clearing the DTC

* The DTC will become history if the IPC no longer detects a failure.

* The history DTC will clear after 100 fault-free ignition cycles.

Reference Information

Schematic Reference

Rear Axle Schematics (See: Transmission and Drivetrain/Differential Assembly/Diagrams/Electrical Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Rear Drive Axle Description and Operation (See: Transmission and Drivetrain/Differential Assembly/Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Ignition ON, observe the IPC Rear Differential Temp Sensor parameter. The value should be.1-4.9 volts and should change with rear differential

temperature.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the rear differential temperature sensor.

2. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground.

瀚慖f less than the specified range, test the reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,

replace the IPC.

瀚慖f greater than the specified range, test the reference circuit for a short to voltage. If the circuit tests normal, replace the IPC.

3. With a scan tool, verify the IPC Rear Differential Temp Sensor parameter is less than 0.1 V.

瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the IPC.

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2010 Cadillac CTS Sedan AWD V6-3.6L Page 544

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) monitors the rear door ajar circuits to indicate the status of the rear doors. When the respective door is opened, the

door ajar signal circuit is switched to ground by the door lock ajar indicator switch, the BCM detects the drop in voltage in the circuit and then

communicates this status to the instrument panel cluster (IPC) via a serial data message. The IPC, upon receipt of this serial data message, will

illuminate the appropriate ajar message in the driver information center (DIC) and when the transaxle is shifted out of PARK, the DIC will also

send a serial data message to the radio to activate the door ajar audible warning.

Conditions for Running the DTC

The system voltage is 9-18 volts.

Conditions for Setting the DTC

The BCM detects a short to ground in a rear door ajar circuit for longer than 10 minutes.

Action Taken When the DTC Sets

The appropriate door ajar indicator is continuously illuminated.

Conditions for Clearing the DTC

* The DTC will be current for as long as the fault is present.

* When the fault is no longer present, the DTC will be a history DTC.

* A history DTC will clear after 50 ignition cycles.

Reference Information

Schematic Reference

Door Lock/Indicator Schematics (See: Body and Frame/Locks/Diagrams/Electrical Diagrams/Door Lock/Indicator Schematics)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Luggage Compartment Description and Operation (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool Right Rear Door Ajar Sw. and Left Rear Door Ajar Sw, parameters while opening and closing each rear door.

The parameters should change between Door Closed and Door Ajar.

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2010 Cadillac CTS Sedan AWD V6-3.6L Page 732

Diagnostic Fault Information

Circuit/System Description

The electronic suspension control module (ESCM) commands variable levels of pulse width modulated current to each damper in response to rough

road, or abrupt steering maneuver driving conditions. The ESC module continuously compares each dampers command state with the state of their

feedback circuits to ensure they agree.

Conditions for Running the DTC

* Battery voltage is between 9-16 volts

* Ignition ON for 30 seconds

Conditions for Setting the DTC

* The damper coil or the circuits to the coil are shorted to ground, shorted to voltage, or open for 3 consecutive ignition ON cycles.

* The vehicle must be driven over 4.8 km/h (3 mph).

Action Taken When the DTC Sets

* The driver information center (DIC) displays a SERVICE RIDE CONTROL or SERVICE SUSPENSION SYSTEM message.

* If the DTC symptom 01 is stored, the electronic suspension control (ESC) system is disabled.

* If the DTC symptom 02 or 04 is stored, the suspect damper is disabled.

Conditions for Clearing the DTC

* A current DTC will clear on the next consecutive malfunction-free ignition cycle.

* A history DTC will clear after 50 consecutive malfunction-free ignition cycles.

Reference Information

Schematic Reference

Electronic Suspension Control Schematics (See: Diagrams/Electrical Diagrams/Suspension Control ( Automatic - Electronic ))

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Electronic Suspension Control Description and Operation (See: Steering and Suspension/Suspension/Suspension Control ( Automatic - Electronic

)/Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

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2010 Cadillac Truck SRX AWD V6-3.0L Page 766

Diagnostic Fault Information

Circuit/System Description

The wheel speeds are detected by active wheel speed sensors and encoder rings. The encoder ring consists of permanent magnets. Each wheel

speed sensor receives 12 V reference voltages from the electronic brake control module (EBCM). The wheel speed sensor produces changing

current between 7-14 mA on the EBCM signal circuit. As the wheel spins, the EBCM uses the frequency of the square wave signal to calculate the

actual wheel speed.

Conditions for Running the DTC

C0035 06 - C0050 06

Ignition ON

C0035 0F - C0050 0F

* Ignition ON

* Vehicle speed is greater than 35 km/h (22 mph)

C0035 18 - C0050 18

* Ignition ON

* Vehicle speed is greater than 10 km/h (6 mph)

C0035 5A - C0050 5A

* Ignition ON

* Vehicle speed is greater than 20 km/h (13 mph)

Conditions for Setting the DTC

C0035 06 - C0050 06

A short to voltage, short to ground or open/high resistance on the wheel speed sensor 12 V reference or low reference circuit is detected for 0.14

second.

C0035 0F - C0050 0F

An erratic wheel speed sensor signal is detected for 0.17 second.

C0035 18 - C0050 18

A missing wheel speed sensor signal is detected for 180 seconds.

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2010 Cadillac CTS Sedan AWD V6-3.6L Page 202

Diagnostic Fault Information

Circuit/System Description

The instrument panel (I/P) dimmer switch is used to increase and decrease the brightness of the interior backlighting components. The I/P dimmer

switch provides a voltage signal that will increase as the brightness of the light are increased and decrease as the brightness of the lights are

decreased. The body control module (BCM) provides a low reference signal and a B+ voltage reference to the I/P dimmer switch. When the I/P

dimmer switch is placed in the desired position, the dimmed voltage setting is applied from the I/P dimmer switch through the I/P dimmer switch

signal circuit to the BCM. The BCM interprets the signal and applies the dimmed voltage to the individual accent lamps via the accent lamps

control circuit. The BCM also sends a serial data message to the driver and front passenger door control modules requesting the accent lamps on

both doors be dimmed to the requested level. The driver and front passenger door modules respond by applying the appropriate voltage for the

requested dim level to the accent lights.

Conditions for Running the DTC

* Battery voltage must be between 9-16 V.

* Park lamps ON.

Conditions for Setting the DTC

The BCM detects a short to ground in the accent lamp control circuit.

Actions Taken When the DTC Sets

The BCM will not illuminate the accent lamps supplied by the accent lamp control circuit.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.

* A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred.

Reference Information

Schematic Reference

Interior Lights Dimming Schematics (See: Diagrams/Electrical Diagrams/Lighting and Horns/System Diagram/Interior Lights Dimming

Schematics)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Interior Lighting Systems Description and Operation (See: Lighting and Horns/Description and Operation/Interior Lighting Systems Description

and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Testing

Note: Each back lighted component may need to be disconnected to isolate a short to voltage or short to ground. Use the schematic to identify the

following:

* Back lighted components the vehicle is equipped with.

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2010 Cadillac Truck SRX AWD V6-3.0L Page 1257

Diagnostic Fault Information

Circuit/System Description

The fuel rail fuel pressure sensor detects fuel pressure within the fuel rail. The engine control module (ECM) provides a 5 V reference voltage on

the 5 V reference circuit and ground on the reference ground circuit. The ECM receives a varying signal voltage on the signal circuit. The ECM

monitors the voltage on the fuel rail fuel pressure sensor circuits. When the fuel pressure is high, the signal voltage is high. When the fuel pressure

is low, the signal voltage is low.

Conditions for Running the DTC

* The engine is running.

* The ignition voltage is between 11-18 V.

* The DTCs run continuously within the enabling conditions.

Conditions for Setting the DTC

P0192

The ECM detects that the fuel rail fuel pressure sensor signal voltage is low.

P0193

The ECM detects that the fuel rail fuel pressure sensor signal voltage is high.

Action Taken When the DTC Sets

* DTCs P0192 and P0193 are Type A DTCs.

* A message center or an indicator may display Reduced Engine Power.

Conditions for Clearing the DTC

DTCs P0192 and P0193 are Type A DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics (LAU) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics

(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Description and Operation

Fuel System Description (LF1) (See: Powertrain Management/Fuel Delivery and Air Induction/Description and Operation/Fuel System

Description)Fuel System Description (LAU or LY7) (See: Powertrain Management/Fuel Delivery and Air Induction/Description and

Operation/Fuel System Description)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2633

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2633

Diagnostic Fault Information

Circuit/System Description

The PTLAN serial data circuits are serial data buses used to communicate information between the control modules. The PTLAN serial data

circuits also connect directly to the data link connector (DLC) for programming purposes. If this serial data system is inoperative the modules will

still communicate with the scan tool due to other serial data systems but not with each other. Communication with the scan tool for the modules on

the PTLAN bus is through the serial data gateway module (SDGM) on the HSGMLAN serial data system.

Conditions for Running the DTCs

* Supply voltage to the modules are in the normal operating range.

* The ignition switch in any position other than START.

Conditions for Setting the DTC

The module setting the DTC has attempted to establish communications on the PTLAN serial data circuits more than 3 times.

Action Taken When the DTCs Sets

* The module suspends all message transmission.

* The MIL and battery indicators will illuminate, along with several DIC messages.

* The vehicle may continue to run for several minutes, then will stall and not start.

Conditions for Clearing the DTC

* A current DTC clears when the malfunction is no longer present.

* A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.

Diagnostic Aids

* Sometimes, while diagnosing a specific customer concern or after a repair, you may notice a history U-code present. However, there is no

associated "current" or "active" status. Loss-of- communication U-codes such as these can set for a variety of reasons. Many times, they're

transparent to the vehicle operator and technician, and/or have no associated symptoms. Eventually, they will erase themselves automatically

after a number of fault-free ignition cycles. This condition would most likely be attributed to one of these scenarios:

- A control module on the data communication circuit was disconnected while the communication circuit is awake.

- Power to one or more modules was interrupted during diagnosis

- A low battery condition was present, so some control modules stop communicating when battery voltage drops below a certain threshold.

- Battery power was restored to the vehicle and control modules on the communication circuit did not all re-initialize at the same time.

- If a loss-of-communication U-code appears in history for no apparent reason, it is most likely associated with one of the scenarios above.

These are all temporary conditions and should never be interpreted as an intermittent fault, causing you to replace a part.

* Do not replace a control module reporting a U code. The U code identifies which control module needs to be diagnosed for a communication

issue.

* Communication may be available between the BCM and the scan tool with the Powertrain High Speed GMLAN serial data system

inoperative. This condition is due to the BCM using both the high and low speed GMLAN systems.

* The engine will not start when there is a total malfunction of the Powertrain High Speed GMLAN serial data bus.

Reference Information

Schematic Reference

* Data Communication Schematics (See: Powertrain Management/Computers and Control Systems/Information Bus/Diagrams/Electrical

Diagrams)

* Control Module References (See: Testing and Inspection/Programming and Relearning)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Data Link Communications Description and Operation (See: Powertrain Management/Computers and Control Systems/Information

Bus/Description and Operation)

Electrical Information Reference

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2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2383

Diagnostic Fault Information

Typical Scan Tool Data

Circuit/System Description

The clutch pressure (PC) solenoid 3 is part of the control solenoid valve assembly which has no serviceable parts. The normally high clutch PC

solenoid 3 regulates and directs the clutch PC solenoid 3 oil pressure to the 4-5-6 clutch regulator valve and 4-5-6 clutch boost valve. Increasing

clutch PC solenoid 3 oil pressure increases oil pressure to the 4-5-6 clutch assembly. The TCM varies the current to the PC solenoid 3 through a

low side driver. Decreasing the current to the clutch PC solenoid 3 increases clutch PC solenoid 3 oil pressure by closing OFF the solenoid exhaust

port. Increasing the current to the clutch PC solenoid 3, decreases clutch PC solenoid 3 oil pressure by opening the solenoid exhaust port. Clutch

PC solenoid 3 power is supplied by the TCM through a high side driver (HSD). The HSD protects the circuit and components from excessive

current flow. If excessive current flow is detected, the HSD will turn OFF. When the fault is corrected the HSD will reset.

Conditions for Running the DTC

P0969, P0970, or P0971

* DTCs P0969, P0970, or P0971 have not set this ignition.

* The ignition voltage is 8.6 volts or greater.

* The engine speed is 500 RPM or greater for 5 seconds.

* The clutch PC solenoid 3 is commanded ON.

Conditions for Setting the DTC

P0969

The TCM detects an internal electrical malfunction on the clutch PC solenoid 3 control circuit where the measured PC solenoid 3 current does not

equal the commanded clutch PC solenoid 3 current for 5 seconds.

P0970

The TCM detects a short to ground on the clutch PC solenoid 3 control circuit for 1 second.

P0971

The TCM detects an open or short to voltage on the Clutch PC solenoid 3 control circuit for 1 second.

Action Taken When the DTC Sets

P0969

* DTC P0969 is a Type C DTCs.

* The TCM freezes transmission adaptive functions.

P0970

* DTC P0970 is a Type A DTC.

* The TCM defaults the transmission to a limited shift pattern utilizing 2 forward gears and reverse gear based on the default detected.

* The TCM forces HSD1 OFF.

* The TCM forces TCC OFF.

* The TCM freezes transmission adaptive functions.

* The TCM commands maximum line pressure.

* The TCM enables Torque management.

* The TCM inhibits TAP Up/Down function.

2010 Cadillac CTS Sedan AWD V6-3.6L Page 626

2010 Cadillac CTS Sedan AWD V6-3.6L Page 626

Diagnostic Fault Information

Circuit/System Description

The HVAC control module detects exhaust gas by an air quality sensor. The air quality sensor is a 3-wire sensor with an ignition voltage circuit, a

ground circuit and a signal circuit.

The sensor outputs a PWM Signal to the HVAC control module with different levels of pollution as detected outside.

The HVAC control module evaluates the information of the air quality sensor and closes the recirculation door while in the automatic mode as soon

as the concentration of pollutants exceeds a preset value.

Conditions for Running the DTC

* Ignition ON.

* The HVAC control module is ON.

Conditions for Setting the DTC

B3843 00

If the PWM signal is greater than 97% for more than 30 seconds.

B3843 02

No PWM is detected and the signal is low for more than 30 seconds.

B3843 05

No PWM is detected and the signal is high for more than 30 seconds.

B3843 21

PWM signal is detected but the frequency is outside of the valid range for more than 30 seconds.

Action Taken When the DTC Sets

The automatic recirculation mode is disabled.

Conditions for Clearing the DTC

The condition for setting the DTC is no longer present.

Reference Information

Schematic Reference

HVAC Schematics (See: Heating and Air Conditioning/Diagrams/Electrical Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Automatic HVAC Description and Operation (See: Heating and Air Conditioning/Description and Operation/HVAC - Automatic)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2143

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2143

Diagnostic Fault Information

Circuit/System Description

The TCC Brake signal circuit is a high voltage input to the body control module (BCM), engine control module (ECM), transmission control

module (TCM), Power Take Off (PTO) module (if equipped) and Trailer Brake controller (if equipped). The BCM monitors the stop lamp switch

circuit to detect when the brake pedal has been applied. The ECM monitors the TCC Brake signal to determine when the brake pedal is applied.

When the brake pedal is applied, the BCM sends a serial data message to the ECM indicating that the brake pedal has been applied. The ECM

senses a high voltage signal on the brake switch signal circuit when the stop lamp switch is closed.

Conditions for Running the DTC

* The engine is running.

* Battery voltage is greater than 11.5 volts.

Conditions for Setting the DTC

P0572

The ECM detects a low voltage signal on the TCC brake signal circuit for more than 2 seconds when the serial data message from the BCM

indicates the brakes are applied. The ECM sets the DTC when the condition has been detected 8 out of 10 times.

P0573

The ECM detects a high voltage signal on the TCC brake signal circuit for more than 2 seconds when the serial data message from the BCM

indicates the brakes are released. The ECM sets the DTC when the condition has been detected 8 out of 10 times.

Actions Taken When the DTC Sets

* The cruise control system becomes disabled.

* The malfunction indicator lamp (MIL) will not illuminate.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.

* A history DTC will clear after 40 malfunction-free ignition cycles have occurred.

Reference Information

Schematic Reference

* Cruise Control Schematics (See: Cruise Control/Diagrams/Electrical Diagrams)

* Exterior Lights Schematics (See: Diagrams/Electrical Diagrams/Lighting and Horns/System Diagram/Exterior Lights Schematics)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Cruise Control Description and Operation (See: Cruise Control/Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

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2010 Cadillac CTS Sedan AWD V6-3.6L Page 795

Diagnostic Fault Information

Circuit/System Description

High pressure fuel is regulated by the high pressure fuel pump actuator, which is a part of the high pressure fuel pump. The high pressure fuel pump

actuator is a solenoid valve. The ECM provides battery voltage on the actuator high control circuit and ground on the actuator low control circuit.

Both circuits are controlled through output drivers within the ECM. When deactivated, both drivers are disabled. When activated, the high control

circuit driver energizes the high pressure fuel pump actuator and the low control circuit driver pulse-width modulates (PWM) the low control circuit

to ground. The ECM monitors the voltage on the circuits to detect a failure.

Conditions for Running the DTC

* The ignition voltage is between 11-18 V.

* The DTCs run continuously within the enabling conditions.

Conditions for Setting the DTC

P0090

* The ECM detects an open circuit in the high pressure fuel pump actuator low control circuit.

* The DTC sets when the above condition is present for 4 s.

P0091

* The ECM detects a short to ground in the high pressure fuel pump actuator low control circuit.

* The DTC sets when the above condition is present for 4 s.

P0092

* The ECM detects a short to voltage in the high pressure fuel pump actuator low control circuit.

* The DTC sets when the above condition is present for 4 s.

P00C8

* The ECM detects an open circuit in the high pressure fuel pump actuator high control circuit.

* The DTC sets when the above condition is present for 4 s.

P00C9

* The ECM detects a short to ground in the high pressure fuel pump actuator high control circuit.

* The DTC sets when the above condition is present for 4 s.

P00CA

* The ECM detects a short to voltage in the high pressure fuel pump actuator high control circuit.

* The DTC sets when the above condition is present for 4 s.

Action Taken When the DTC Sets

* DTCs P0090, P0091, P0092, P00C8, P00C9, and P00CA are Type A DTCs.

* A message center or an indicator displays Reduced Engine Power.

Conditions for Clearing the DTC

DTCs P0090, P0091, P0092, P00C8, P00C9, and P00CA are Type A DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics (LLT) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics

(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Fuel System Description (See: Powertrain Management/Computers and Control Systems/Description and Operation/Fuel System Description)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2095

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2095

Diagnostic Fault Information

Typical Scan Tool Data

Circuit/System Description

The engine cooling fan system consists of 2 electric cooling fans and 3 fan relays. The cooling fan relays are arranged in a series/parallel (S/P)

configuration. This allows the engine control module (ECM) to operate both fans together at low or high speeds using 2 fan control circuits. The

cooling fans receive positive voltage from the cooling fan relays, which receive battery positive voltage from the underhood fuse block. The

cooling fans are supplied a ground at G100 and G101.

Conditions for Running the DTC

* The system voltage is between 9-18 volts.

* The engine speed is greater than 400 RPM.

* DTCs P0480 and P0481 run continuously when the conditions above are met.

Conditions for Setting the DTC

* The commanded state of the ECM driver and the actual state of the control circuit do not match.

* The condition exists for greater than 5 seconds.

Action Taken When the DTC Sets

DTCs P0480 and P0481 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0480 and P0481 are Type B DTCs.

Diagnostic Aids

* The ECM has the capability of providing command to the fan relays even when a scan tool output control is being used. Always refer to the

fan control command parameters on the scan tool to know which fans are being commanded ON by the ECM.

* The scan tool cooling fan output control operates as follows:

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2088

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2088

Diagnostic Fault Information

Circuit/System Description

The fuel level sensor changes resistance in response to the fuel level. The engine control module (ECM) monitors the signal circuit of the fuel level

sensor and the type of fuel in order to determine the fuel level. For regular unleaded fuel the ECM monitors a constant signal. When the vehicle has

approximately 20% or greater ethanol for E85 fuel applications, the ECM controls a pulse cycle signal where it monitors the signal and calculates

the fuel level percentage only during the on pulse of approximately 100 ms.

When the fuel tank is full, the sensor resistance is low and the ECM senses a low signal voltage. When the fuel tank is empty, the sensor resistance

is high and the ECM senses a high signal voltage. The ECM uses the signal circuit of the fuel level sensor in order to calculate the percentage of

remaining fuel in the tank. The ECM sends the fuel level percentage via the serial data circuit to the instrument cluster in order to control the fuel

gauge.

Conditions for Running the DTC

* The ignition is ON, with the engine running.

* The system voltage is between 11-18 V.

Conditions for Setting the DTC

* The sensor output is greater than 3.5 V.

* The above condition is present for greater than 30 seconds.

Action Taken When the DTC Sets

* The fuel gauge defaults to empty.

* The low fuel indicator illuminates.

* The ECM records the operating conditions at the time that the diagnostic test fails. The ECM displays the failure information in the Failure

Records on the scan tool.

Conditions for Clearing the DTC

* The DTC becomes history when the conditions for setting the DTC are no longer present.

* The history DTC clears after 40 malfunction-free warm-up cycles.

Diagnostic Aids

A defective fuel level sensor most likely will not set DTC P0463. The sensor has a 500 ohm default resistor that will prevent it from meeting the

code setting criteria of this DTC. Look for problems in the wiring and in the inline and harness connectors at the sensor and ECM.

Reference Information

Schematic Reference

Instrument Cluster Schematics (See: Diagrams/Electrical Diagrams/Instrument Panel, Gauges and Warning Indicators/System Diagram/Instrument

Cluster Schematics)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Instrument Cluster Description and Operation (See: Instrument Panel, Gauges and Warning Indicators/Description and Operation/Instrument

Cluster)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1934

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1934

Diagnostic Fault Information

Circuit/System Description

The control module enables the appropriate fuel injector pulse for each cylinder. Ignition voltage is supplied to the fuel injectors. The control

module controls each fuel injector by grounding the control circuit via a solid state device called a driver. The control module monitors the status of

each driver.

Conditions for Running the DTC

* The engine is running.

* The ignition voltage is greater than 11 V.

* DTC P0201-P0208 runs continuously when the above conditions are met.

Conditions for Setting the DTC

The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for greater than 2 s.

Action Taken When the DTC Sets

DTCs P0201, P0202, P0203, P0204, P0205, P0206, P0207, and P0208 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0201, P0202, P0203, P0204, P0205, P0206, P0207, and P0208 are Type B DTCs.

Diagnostic Aids

Performing the Fuel Injector Diagnosis may help isolate an intermittent condition. Refer to Fuel Injector Diagnosis (CH47976) (See: Powertrain

Management/Fuel Delivery and Air Induction/Fuel Injector/Testing and Inspection)Fuel Injector Diagnosis (J39021 or Scan Tool) (See:

Powertrain Management/Fuel Delivery and Air Induction/Fuel Injector/Testing and Inspection).

Reference Information

Schematic Reference

Engine Controls Schematics (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Fuel System Description (See: Powertrain Management/Computers and Control Systems/Description and Operation/Fuel System Description)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

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2010 Cadillac CTS Sedan AWD V6-3.6L Page 1094

Diagnostic Fault Information

Typical Scan Tool Data

Circuit Description

The heated oxygen sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding

air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an Open Loop mode, ignoring the

HO2S signal voltage while calculating the air-to-fuel ratio. The control module supplies the HO2S with a reference, or bias voltage of about 450

mV. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0-1,000 mV. This voltage will fluctuate above

and below the bias voltage. Once sufficient HO2S voltage fluctuation is observed by the control module, Closed Loop is entered. The control

module uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases above bias voltage toward 1,000 mV indicates a

rich fuel mixture. An HO2S voltage that decreases below bias voltage toward 0 mV indicates a lean fuel mixture.

The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed

Loop earlier and the control module to calculate the air-to-fuel ratio sooner.

Conditions for Running the DTC

* DTC P0201, P0202, P0203, P0204, P0205, P0206 P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276,

P0277, P2146, P2149, P2152, P2155, P216A, or P216D is not set.

* The ignition voltage is greater than 10 volts.

* The engine speed is greater than 240 RPM.

* The HO2S 1 heater duty cycle is greater than 90 percent for greater than 5 seconds.

* The ECM is not commanding the air/fuel mixture rich.

* DTC P0132 and P0152 run continuously once the conditions above exist for greater than 5 seconds.

Conditions for Setting the DTC

The ECM detects that an HO2S 1 signal voltage is greater than 1,150 mV.

Action Taken when the DTC Sets

DTCs P0132 and P0152 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0132 and P0152 are Type B DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics (LLT) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics

(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Electrical Information Reference