2010 Cadillac Truck SRX FWD V6-3.0L Page 859

2010 Cadillac Truck SRX FWD V6-3.0L Page 859

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions)provides an overview of each diagnostic category.

DTC Descriptors

DTC C0460 71

- Steering Position Sensor Invalid Data

DTC C0710 42

- Steering Position Signal Calibration Not Programmed

DTC C0710 5A

- Steering Position Signal Not Plausible

DTC C0710 71

- Steering Position Signal Invalid Data

Diagnostic Fault Information

Circuit/System Description

The steering angle sensor receives a 12 V reference voltage from the electronic brake control module (EBCM). The EBCM receives high speed

controller area network (CAN) message inputs from the steering angle sensor identifying the position and direction of the steering wheel rotation.

The EBCM utilizes this signal to calculate the driver intended driving direction.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

C0460 71

The electronic suspension control module received an invalid steering angle sensor signal.

C0710 42

The steering angle sensor is not calibrated.

C0710 5A

* The steering angle sensor signal is out of specified range.

* The steering angle sensor signal is not plausible with the yaw rate sensor and lateral acceleration sensor signal.

* The steering angle sensor offset is out of specified range.

C0710 71

The steering angle sensor signal is invalid.

Action Taken When the DTC Sets

* The EBCM disables the stability control and hill start assist for the duration of the ignition cycle.

2010 Cadillac Truck SRX FWD V6-3.0L Page 1654

2010 Cadillac Truck SRX FWD V6-3.0L Page 1654

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC P0685

- Engine Controls Ignition Relay Control Circuit

DTC P0690

- Engine Controls Ignition Relay Feedback Circuit High Voltage

Diagnostic Fault Information

Typical Scan Tool Data

Circuit/System Description

The engine controls ignition relay or powertrain relay is a normally open relay. The relay switch is held in the open position by spring tension.

Battery positive voltage is supplied directly to the relay coil and the switch contact at all times. The engine control module (ECM) supplies the

ground path to the relay coil control circuit via an internal integrated circuit called an output driver. When the ECM commands the powertrain relay

ON, ignition voltage is supplied to several fuses in the under-hood fuse block.

The ignition voltage that is supplied to the ECM provides power to the internal ECM circuits associated with the throttle actuator control (TAC)

operation. The ECM also monitors the voltage level on the ignition voltage circuit to confirm that the powertrain relay contacts have closed.

Conditions for Running the DTC

* The ignition is ON.

* The ignition voltage is between 11-18 V.

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

Conditions for Setting the DTC

P0685

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.

P0690

* The ECM detects the engine controls ignition relay feedback circuit is greater than 2 V when the relay is commanded OFF.

* The ECM detects the engine controls ignition relay feedback circuit is greater than 18 V when the relay is commanded ON.

* The condition is present for greater than 2 s.

Action Taken When the DTC Sets

DTCs P0685 and P0690 are Type B DTCs.

Conditions for Clearing the DTC

2010 Cadillac Truck SRX FWD V6-3.0L Page 1047

2010 Cadillac Truck SRX FWD V6-3.0L Page 1047

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0030

- HO2S Heater Control Circuit Bank 1 Sensor 1

DTC P0036

- HO2S Heater Control Circuit Bank 1 Sensor 2

DTC P0050

- HO2S Heater Control Circuit Bank 2 Sensor 1

DTC P0053

- HO2S Heater Resistance Bank 1 Sensor 1

DTC P0054

- HO2S Heater Resistance Bank 1 Sensor 2

DTC P0056

- HO2S Heater Control Circuit Bank 2 Sensor 2

DTC P0059

- HO2S Heater Resistance Bank 2 Sensor 1

DTC P0060

- HO2S Heater Resistance Bank 2 Sensor 2

DTC P0135

- HO2S Heater Performance Bank 1 Sensor 1

DTC P0141

- HO2S Heater Performance Bank 1 Sensor 2

DTC P0155

- HO2S Heater Performance Bank 2 Sensor 1

DTC P0161

- HO2S Heater Performance Bank 2 Sensor 2

Diagnostic Fault Information

2010 Cadillac Truck SRX FWD V6-3.0L Page 961

2010 Cadillac Truck SRX FWD V6-3.0L Page 961

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0011

- Intake Camshaft Position System Performance Bank 1

DTC P0014

- Exhaust Camshaft Position System Performance Bank 1

DTC P0021

- Intake Camshaft Position System Performance Bank 2

DTC P0024

- Exhaust Camshaft Position System Performance Bank 2

Circuit/System Description

The camshaft position actuator system enables the Engine Control Module (ECM) to change the timing of the camshafts while the engine is

operating. The camshaft position actuator solenoid signal from the ECM is pulse width modulated (PWM). The ECM controls the camshaft position

actuator solenoid duty cycle by controlling the amount of solenoid ON time. The camshaft position actuator solenoid controls the advance or the

retard of each camshaft. The camshaft position actuator solenoid controls the oil flow that applies the pressure to advance or retard the camshafts.

Conditions for Running the DTC

* DTC P0010, P0013, P0020, P0023, P0016, P0017, P0018, P0019, P0335, P0336, P0340, P0341, P0345, P0346, P0365, P0366, P0390, and

P0391 is not set.

* The ignition voltage is greater than 11 V.

* The engine is operating.

* The desired camshaft position is not changing greater than 4.5 degrees for at least 1 s.

* Both of the desired and actual camshaft position actuator values cannot be greater than 20 degrees or less than 5 degrees.

* DTCs P0011, P0014, P0021, and P0024 run continuously once the above conditions are met.

Conditions for Setting the DTC

P0011 and P0021

The ECM detects the difference between the desired and actual camshaft position angle is greater than 5 degrees for greater 2.5 s.

P0014 and P0024

The ECM detects the difference between the desired and actual camshaft position angle is greater than 5 degrees for greater 10 s.

Action Taken When the DTC Sets

DTCs P0011, P0014, P0021, and P0024 are type B DTCs.

Conditions for Clearing the DTC

DTCs P0011, P0014, P0021, and P0024 are type B DTCs.

Diagnostic Aids

Inspect the engine for any recent engine mechanical repairs. An incorrectly installed camshaft, camshaft position actuator solenoid, mechanical

camshaft actuator, or timing chain can cause this DTC to set.

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

2010 Cadillac Truck SRX FWD V6-3.0L Page 852

2010 Cadillac Truck SRX FWD V6-3.0L Page 852

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC C0595 02

- Left Front Acceleration Sensor Circuit Short to Ground

DTC C0595 05

- Left Front Acceleration Sensor Circuit High Voltage/Open

DTC C0595 0A

- Left Front Acceleration Sensor Circuit Too Slow Transitions

DTC C0600 02

- Right Front Acceleration Sensor Circuit Short to Ground

DTC C0600 05

- Right Front Acceleration Sensor Circuit High Voltage/Open

DTC C0600 0A

- Right Front Acceleration Sensor Circuit Too Slow Transitions

DTC C0605 02

- Left Rear Acceleration Sensor Circuit Short to Ground

DTC C0605 05

- Left Rear Acceleration Sensor Circuit High Voltage/Open

DTC C0605 0A

- Left Rear Acceleration Sensor Circuit Too Slow Transitions

Diagnostic Fault Information

Circuit/System Description

The suspension control module supplies a 5 V reference voltage and a low reference to each body acceleration sensor. The body acceleration

sensors supply a signal of 0.5-4.5 V to the suspension control module.

Conditions for Running the DTC

System voltage is between 9-16 V

2010 Cadillac Truck SRX FWD V6-3.0L Page 1027

2010 Cadillac Truck SRX FWD V6-3.0L Page 1027

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0010

- Intake Camshaft Position Actuator Solenoid Valve Control Circuit Bank 1

DTC P0013

- Exhaust Camshaft Position Actuator Solenoid Valve Control Circuit Bank 1

DTC P0020

- Intake Camshaft Position Actuator Solenoid Valve Control Circuit Bank 2

DTC P0023

- Exhaust Camshaft Position Actuator Solenoid Valve Control Circuit Bank 2

Circuit/System Description

The camshaft position actuator system enables the Engine Control Module (ECM) to change the timing of the camshafts while the engine is

operating. The Camshaft Position Actuator Solenoid Valve signal from the ECM is pulse width modulated (PWM). The ECM controls the

Camshaft Position Actuator Solenoid Valve duty cycle by controlling the amount of solenoid valve ON time. The Camshaft Position Actuator

Solenoid Valve controls the advance or the retard of each camshaft. The Camshaft Position Actuator Solenoid Valve controls the oil flow that

applies the pressure to advance or retard the camshafts.

The ECM controls the Camshaft Position Actuator Solenoid Valve by suppling a 12 V pulse width modulated (PWM) signal. The ECM supplies a

ground to the low reference circuit.

Conditions for Running the DTC

* The ignition voltage is greater than 11 V.

* The ignition switch is in the Crank or Run position.

* The ECM commanded the Camshaft Position Actuator Solenoid Valve ON.

* DTCs P0010, P0013, P0020, and P0023 run continuously once 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 5 s.

Action Taken When the DTC Sets

DTCs P0010, P0013, P0020, and P0023 are type B DTCs.

Conditions for Clearing the DTC

DTCs P0010, P0013, P0020, and P0023 are type B DTCs.

Diagnostic Aids

If the condition is intermittent, move the related harnesses and connectors, with the engine operating, while monitoring the scan tool circuit status

parameters for the component. The circuit status parameters change from OK or Not Run to Malfunction if there is a condition with the circuit or a

connection.

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

2010 Cadillac Truck SRX FWD V6-3.0L Page 2070

2010 Cadillac Truck SRX FWD V6-3.0L Page 2070

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P2600

- Auxiliary Coolant Pump Relay Control Circuit

DTC P2601

- Auxiliary Coolant Pump Performance

DTC P2602

- Auxiliary Coolant Pump Relay Control Circuit Low Voltage

DTC P2603

- Auxiliary Coolant Pump Relay Control Circuit High Voltage

Diagnostic Fault Information

Circuit/System Description

The auxiliary coolant pump and cooling fan system provides a measure of prevention against fuel vaporization due to excessive engine

temperatures. The engine control module (ECM) commands the auxiliary or after boil coolant pump ON when the engine coolant temperature

exceeds a calibrated value after engine shut down. The ECM applies ground to the coil side of the auxiliary pump printed circuit board (PCB) relay.

This energizes the coil and applies voltage directly to the pump motor through the switch side of the relay.

Conditions for Running the DTC

P2600, P2602, or P2603

* The engine speed is greater than 80 RPM.

* The ignition voltage is between 10-18 V.

* The ECM has commanded the pump ON and OFF at least once during the ignition cycle.

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

P2601

* DTC P0111, P0112, P0113, P0116, P0117, P0118, P0119, P2600, P2602, or P2603 is not set.

* The ignition is OFF.

* The engine coolant temperature (ECT) at engine shut down is warmer than 110 掳C (230 掳F).

* The auxiliary coolant pump is enabled.

* The DTC runs continuously once the conditions above are met for greater than 30 S.

Conditions for Setting the DTC

P2600

The ECM detects the pump control circuit is open. The condition exists for 4 S or a cumulative of 30 S.

P2601

The ECM detects that the ECT decreases less than 2 掳C (4 掳F) within 60 seconds. The condition exists for 4 S or a cumulative of 30 S.

P2602

The ECM detects the pump control circuit is shorted to ground. The condition exists for 4 seconds or a cumulative of 30 seconds.

P2603

The ECM detects the pump control circuit is shorted to voltage. The condition exists for 4 seconds or a cumulative of 30 seconds.

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2010 Cadillac Truck SRX FWD V6-3.0L Page 1554

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC P0560

- System Voltage - ECM

Diagnostic Fault Information

Circuit/System Description

The engine control module (ECM) monitors the system voltage to ensure that the voltage stays within the proper range. Damage to components,

and incorrect data may occur when the voltage is out of range.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The ECM detects that the battery voltage is less than 2.54 V for 5 seconds.

Action Taken When the DTC Sets

DTC P0560 is a C type DTC.

Conditions for Clearing the DTC

DTC P0560 is a C type DTC.

Diagnostic Aids

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

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

Charging System Description and Operation (See: Starting and Charging/Charging System/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)

2010 Cadillac Truck SRX FWD V6-3.0L Page 1948

2010 Cadillac Truck SRX FWD V6-3.0L Page 1948

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P1516

- Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

DTC P2101

- Throttle Actuator Position Performance

DTC P2119

- Throttle Closed Position Performance

DTC P2176

- Minimum Throttle Position Not Learned

Diagnostic Fault Information

Circuit/System Description

The engine control module (ECM) controls the throttle valve by applying a varying voltage to the control circuits of the throttle actuator control

(TAC) motor. The ECM monitors the duty cycle that is required to actuate the throttle valve. The ECM monitors the throttle position (TP) sensors 1

and 2 to determine the actual throttle valve position.

Conditions for Running the DTC

P1516

* The ignition voltage is greater than 6 V and reduced power is not active.

* The engine is running.

* DTCs P1516 runs continuously when the above conditions are met.

P2101

* DTC P1682 not set.

* The engine is running.

* The ECM has learned the minimum throttle position.

* The ignition voltage is greater than 6 V and reduced power is not active.

* DTCs P2101 run continuously when the above conditions are met.

P2119

* DTCs P0121, P0122, P0123, P0222, P0223, P0641, P0651, P0697, P06A3, or P2135 are not set.

* The ignition is ON.

* The ignition voltage is greater than 6 V.

* DTC P2119 runs continuously when the above conditions are met.

P2176

* DTCs P0068, P0122, P0123, P0222, P0223 are not set.

* The ignition is ON.

* The ignition voltage is greater than 6 V and reduced power is not active.

* DTC P2176 runs continuously when the above conditions are met.

Conditions for Setting the DTC

2010 Cadillac Truck SRX FWD V6-3.0L Page 867

2010 Cadillac Truck SRX FWD V6-3.0L Page 867

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions)provides an overview of each diagnostic category.

DTC Descriptor

DTC C0750 03

- Left Front Tire Pressure Sensor Low Voltage

DTC C0750 29

- Left Front Tire Pressure Sensor Too Few Pulses

DTC C0750 39

- Left Front Tire Pressure Sensor Internal Malfunction

DTC C0755 03

- Right Front Tire Pressure Sensor Low Voltage

DTC C0755 29

- Right Front Tire Pressure Sensor Too Few Pulses

DTC C0755 39

- Right Front Tire Pressure Sensor Internal Malfunction

DTC C0760 03

- Left Rear Tire Pressure Sensor Low Voltage

DTC C0760 29

- Left Rear Tire Pressure Sensor Too Few Pulses

DTC C0760 39

- Left Rear Tire Pressure Sensor Internal Malfunction

DTC C0765 03

- Right Rear Tire Pressure Sensor Low Voltage

DTC C0765 29

- Right Rear Tire Pressure Sensor Too Few Pulses

DTC C0765 39

- Right Rear Tire Pressure Sensor Internal Malfunction

Circuit/System Description

The tire pressure monitor (TPM) system has a radio frequency (RF) transmitting pressure sensor in each wheel/tire assembly. As vehicle speed

increases, centrifugal force closes the sensors internal roll switch, which puts the sensor into Rolling mode. The body control module (BCM)

receives and translates the data contained in the tire pressure sensor RF transmissions into sensor presence, sensor mode, and tire pressure. Once

vehicle speed is greater than 40km/h (25 mph), the BCM waits for the first sensor to go into Rolling mode, then checks if all sensors have gone into

Rolling mode. If one or more sensors do not go into these modes, or do not transmit at all, the BCM will set DTC C0750, C0755, C0760, or C0765

respectively.

Conditions for Running the DTC

Vehicle speed is greater than 40 km/h (25 mph).

Conditions for Setting the DTC

* A sensor does not transmit for 18 minutes.

* A sensor low battery condition.

Action Taken When the DTC Sets

* The tire pressure monitor indicator icon on the instrument panel cluster (IPC) flashes for 1 minute and then remains illuminated after the

ignition switch is cycled ON and the IPC bulb check is complete.

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2010 Cadillac CTS Sedan AWD V6-3.6L Page 885

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0016

- Crankshaft Position (CKP) - Intake Camshaft Position (CMP) Correlation Bank 1

DTC P0017

- Crankshaft Position (CKP) - Exhaust Camshaft Position (CMP) Correlation Bank 1

DTC P0018

- Crankshaft Position (CKP) - Intake Camshaft Position (CMP) Correlation Bank 2

DTC P0019

- Crankshaft Position (CKP) - Exhaust Camshaft Position (CMP) Correlation Bank 2

Circuit/System Description

The engine control module (ECM) uses the crankshaft position (CKP) sensor and the camshaft position (CMP) sensor pulses to monitor the

correlation between the crankshaft and the camshaft position. An improper relative position can be caused by either engine timing or improper

indexing of the camshaft drive chain.

Conditions for Running the DTC

* Before the ECM can report DTC P0016, P0017, P0018, or P0019 failed, DTCs P0010, P0011, P0013, P0014, P0020, P0021, P0023, P0024,

P0335, P0336, P0338, P0341, P0342, P0343, P0346, P0347, P0348, P0366, P0367, P0368, P0391, P0392, P0393, P2088, P2089, P2090,

P2091, P2092, P2093, P2094, and P2095 must run and pass.

* The engine is operating for greater than 50 seconds.

* The engine coolant temperature is between 0-95掳C (32-203掳F).

* The calculated engine oil temperature is less than 120掳C (248掳F).

* DTC P0016, P0017, P0018, and P0019 run continuously once the above conditions are met for approximately 10 minutes.

Conditions for Setting the DTC

The ECM detects a deviation in the relationship between a camshaft and the crankshaft. The ECM detects the learned camshaft angle is greater than

10 degrees advanced or 10 degrees retarded in relationship to the crankshaft.

OR

The ECM detects the actual camshaft angle is advanced 15 degrees or retarded 21 degrees in relationship to the camshaft parked/reference position.

Action Taken When the DTC Sets

DTCs P0016, P0017, P0018, and P0019 are type B DTCs.

Conditions for Clearing the DTC

DTCs P0016, P0017, P0018, and P0019 are type B DTCs.

Diagnostic Aids

* Inspect the engine for any recent engine mechanical repairs. An incorrectly installed camshaft, camshaft actuator, camshaft sensor, crankshaft

sensor, or timing chain can cause this DTC to set.

* The presence of DTCs P0008 and P0009 along with P0016, P0017, P0018, and P0019 indicates a possible condition with the primary timing

chain and the alignment between both intermediate sprockets and the crankshaft. Or, the crankshaft reluctor wheel has moved and is no

longer referenced to top dead center (TDC).

* Observe the Desired Intake Camshaft Position and the Camshaft Position parameters with a scan tool before a DTC sets. This may help to

isolate whether a condition is specific to one camshaft, one bank, or caused by a condition with the primary crankshaft timing.

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1030

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1030

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions)provides an overview of each diagnostic category.

DTC Descriptors

DTC P0117

- Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage

DTC P0118

- Engine Coolant Temperature (ECT) Sensor Circuit High Voltage

Diagnostic Fault Information

Typical Scan Tool Data

Circuit Description

The engine coolant temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. The engine control module

(ECM) supplies 5 volts to the ECT signal circuit and supplies a ground to the low reference circuit.

The following table illustrates the difference between temperature, resistance, and voltage:

Conditions for Running the DTC

P0117

* The engine is operating.

* The start up intake air temperature (IAT) is less than 72掳C (161掳F).

OR

* The start up intake air temperature (IAT) is greater than 72掳C (161掳F).

* The engine run time is greater than 59 seconds.

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

P0118

* The ignition is ON or the engine is operating.

* The DTC runs continuously once the above condition is met.

Conditions for Setting the DTC

2010 Cadillac CTS Sedan AWD V6-3.6L Page 973

2010 Cadillac CTS Sedan AWD V6-3.6L Page 973

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC P069E

- Fuel Pump Control Module Requested MIL Illumination

Circuit/System Description

The fuel pump control module uses the serial data network to signal the engine control module (ECM) that the fuel pump control module is

requesting malfunction indicator lamp (MIL) illumination. A DTC is set in the fuel pump control module, and the request for MIL illumination is

sent when the fuel pump control module determines that a failure that affects emissions has occurred in the fuel pump control system. When the

ECM receives the message from the fuel pump control module, DTC P069E will set in the ECM.

Conditions for Running the DTC

The ignition is ON, or the engine is running.

Conditions for Setting the DTC

The fuel pump control module requests the ECM to illuminate the MIL.

Action Taken When the DTC Sets

* DTC P069E is a Type A DTC.

* DTC P069E will continue to be current or active as long as the fuel pump control module is requesting MIL illumination.

Conditions for Clearing the DTC

DTC P069E is a Type A DTC.

Diagnostic Aids

Communication codes, U-codes, as well as powertrain codes, P-codes, set in the fuel pump control module will cause the fuel pump control module

to request DTC P069E to be set in the ECM.

Reference Information

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

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

Circuit/System Verification

Note: Correct any engine controls and communication DTCs before diagnosing fuel pump control module DTCs.

1. DTC P069E is an informational DTC. If there are no engine controls or communication DTCs, refer to Diagnostic Trouble Code (DTC) List -

Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) for diagnosis of fuel pump control

module DTCs.

2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the

conditions that you observed from the Freeze Frame/Failure Records data.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

Aisin AY6 - Manual Transmission

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2010 Cadillac CTS Sedan AWD V6-3.6L Page 1080

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0137

- HO2S Circuit Low Voltage Bank 1 Sensor 2

DTC P0138

- HO2S Circuit High Voltage Bank 1 Sensor 2

DTC P0140

- HO2S Circuit Insufficient Activity Bank 1 Sensor 2

DTC P0157

- HO2S Circuit Low Voltage Bank 2 Sensor 2

DTC P0158

- HO2S Circuit High Voltage Bank 2 Sensor 2

DTC P0160

- HO2S Circuit Insufficient Activity Bank 2 Sensor 2

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 DTCs

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2010 Cadillac CTS Sedan AWD V6-3.6L Page 422

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B1735 01

- Seat Front Up Switch Circuit Short to Battery

DTC B1740 01

- Seat Front Down Switch Circuit Short to Battery

DTC B1745 01

- Seat Rear Up Switch Circuit Short to Battery

DTC B1750 01

- Seat Rear Down Switch Circuit Short to Battery

DTC B1755 01

- Seat Assembly Forward Switch Circuit Short to Battery

DTC B1760 01

- Seat Assembly Rearward Switch Circuit Short to Battery

DTC B1815 01

- Seat Recline Forward Switch Circuit Short to Battery

DTC B1820 01

- Seat Recline Rearward Switch Circuit Short to Battery

Diagnostic Fault Information

Circuit/System Description

When the power seat switches are pressed, they send a 12 V signal through the switch signal circuits to the memory seat module (MSM). The MSM

then commands the driver seat and lumbar motors to move in response to the switch signals.

Conditions for Running the DTC

The MSM must be powered.

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2010 Cadillac CTS Sedan AWD V6-3.6L Page 971

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC P0068

- Throttle Body Airflow Performance

DTC P1101

- Intake Air Flow System Performance

Circuit/System Description

The engine control module (ECM) compares actual airflow based on throttle position (TP) to a calculated airflow based on manifold absolute

pressure (MAP) sensor, and mass air flow (MAF).

Conditions for Running the DTC

DTC P0068

* The engine speed is greater than 800 RPM.

* The ignition voltage is greater than 6.0 V.

* The throttle actuator control system is not in reduced power mode.

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

DTC P1101

* DTCs P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0335, P0336 are not set

* The engine speed is between 400-7,000 RPM

* The engine coolant temperature (ECT) is between 69-127掳C (156-260掳F).

* The intake air temperature (IAT) is between -20 to +125掳C (-4 to +257掳F).

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

Conditions for Setting the DTC

The ECM detects that the actual airflow rate is greater than the calculated airflow.

Action Taken When the DTC Sets

* DTC P0068 is a type A DTC.

* DTC P1101 is a type B DTC.

Conditions for Clearing the DTC

* DTC P0068 is a type A DTC.

* DTC P1101 is a type B DTC.

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

* 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 CTS Sedan AWD V6-3.6L Page 1120

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1120

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0171

- Fuel Trim System Lean Bank 1

DTC P0172

- Fuel Trim System Rich Bank 1

DTC P0174

- Fuel Trim System Lean Bank 2

DTC P0175

- Fuel Trim System Rich Bank 2

Circuit/System Description

The engine control module (ECM) controls a Closed Loop air/fuel metering system in order to provide the best possible combination of

driveability, fuel economy, and emission control. The ECM monitors the heated oxygen sensor (HO2S) signal voltage, and adjusts the fuel delivery

based on the signal voltage while in Closed Loop. A change made to the fuel delivery changes the long and short term fuel trim values. The short

term fuel trim values change rapidly in response to the HO2S signal voltages. These changes fine tune the engine fueling. The long term fuel trim

values change in response to trends in the short term fuel trim The long term fuel trim makes coarse adjustments to fueling in order to re-center and

restore control to short term fuel trim. The ideal fuel trim values are around 0 %. A positive fuel trim value indicates that the ECM is adding fuel in

order to compensate for a lean condition. A negative fuel trim value indicates that the ECM is reducing the amount of fuel in order to compensate

for a rich condition.

If the ECM detects an excessively lean condition, DTC P0171 or P0174 sets. If the ECM detects an excessively rich condition, DTC P0172 or

P0175 sets.

Conditions for Running the DTC

* DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0201-P0206, P0300-P0306, P0442, P0443, P0446, P0449, P0451-P0455, P0496,

P0506, P0507, P2227-P2230, P2269 are not set.

* The engine is in Closed Loop status.

* The engine coolant temperature (ECT) is between -38 and +150掳C (-36 and +302掳F).

* The intake air temperature (IAT) is between -38 and +150掳C (-36 and +302掳F).

* The manifold absolute pressure (MAP) is between 5-255 kPa (1.45-37 psi).

* The vehicle speed is less than 134 km/h (83 mph).

* The engine speed is between 400-6,600 RPM.

* The mass air flow (MAF) is between 0.5-510 g/s.

* The barometric pressure (BARO) is greater than 70 kPa (10.2 psi).

* The fuel level is greater than 10 %.

* This diagnostic runs continuously when the above conditions have been met.

Conditions for Setting the DTC

* The average long term FT weighted average value is greater or less than a calibrated value.

* The above condition is present for approximately 3 min after the Conditions for Running the DTC have been met.

Action Taken When the DTC Sets

DTCs P0171, P0172, P0174, and P0175 are Type B DTCs.

Conditions for Clearing the MIL/DTC

DTCs P0171, P0172, P0174, and P0175 are Type B DTCs.

Diagnostic Aids

* Allow the engine to reach operating temperature. With the engine running, observe the HO2S parameter with a scan tool. The HO2S value

should vary from approximately 40 mV to approximately 900 mV, and respond to fueling changes.

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2010 Cadillac Truck SRX AWD V6-3.0L Page 326

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B297B 5A

- Driver Door Open Switch Circuit Not Plausible

DTC B297C 5A

- Passenger Door Open Switch Circuit Not Plausible

Diagnostic Fault Information

Circuit/System Description

The keyless entry control module supplies a 12V signal to the driver and passenger door open switch signal circuits. The driver window motor

supplies a 12V signal to the driver door ajar switch signal circuit. The passenger window switch supplies a 12V signal to the passenger door ajar

switch signal circuit. The door open switches and the door ajar switches are integral to each door latch assembly.

The door open switch and the door ajar switch contacts will be open with the door is fully closed, the door switches within the door latch are

designed so that the when the door is ajar, the contact in the door ajar switch closes and the window motor will then send a serial data message to

the BCM indicating that the door is ajar. When the door is opened further, the contact in the door open switch will then close providing a ground

for the door open signal circuit, the keyless entry control module will then detect that the door is open.

Conditions for Running the DTC

Battery voltage is between 9-16 V.

Conditions for Setting the DTC

B297B 5A

* The keyless entry control module detects the driver door open switch is Active while receiving a serial data message from the BCM that the

driver door ajar switch is Inactive.

* The condition must be present for greater than 2 seconds

B297C 5A

* The keyless entry control module detects the passenger door open switch is Active while receiving a serial data message from the BCM that

the passenger door ajar switch is Inactive.

* The condition must be present for greater than 2 seconds.

Action Taken When the DTC Sets

B297B 5A

The keyless entry control module ignores the inputs from the driver exterior door handle switch.

B297C 5A

The keyless entry control module ignores the inputs from the passenger exterior door handle switch.

Conditions for Clearing the DTC

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

* When the keyless entry control module receives a serial data message from the BCM that the door is ajar before the keyless entry control

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2010 Cadillac Truck SRX AWD V6-3.0L Page 154

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B048D 01

- Auxiliary Heater Temperature Command Circuit Short to Battery

DTC B048D 06

- Auxiliary Heater Temperature Command Circuit Low Voltage/Open

DTC B048E 00

- Auxiliary Heater System Malfunction

Circuit/System Description

The HVAC control module sends a pulse width modulation (PWM) signal to the electrical auxiliary heater, if the interior temperature is too low

and additional heat is requested. The request signal from the HVAC control module, battery positive, ignition and ground circuits enable the

electrical auxiliary heater to operate. Through the signal circuit the electrical auxiliary heater sends via a PWM signal the current status to the

HVAC control module.

Conditions for Running the DTC

* Ignition ON.

* The HVAC control module is ON.

* The electrical auxiliary heater is ON.

Conditions for Setting the DTC

B048D 01

The voltage at the HVAC control module output to the electrical auxiliary heater is always high.

B048D 06

The voltage at the HVAC control module output to the electrical auxiliary heater is always low or floating.

B048E 00

The feedback signal of the electrical auxiliary heater does not correspond with the requested PWM signal.

Action Taken When the DTC Sets

The electrical auxiliary heater is inoperative.

Conditions for Clearing the DTC

The feedback signal of the electrical auxiliary heater corresponds with the requested PWM signal.

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/Connector End Views By Name)

Description and Operation

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

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2010 Cadillac Truck SRX AWD V6-3.0L Page 245

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B0173 02

- Upper Left Duct Air Temperature Sensor Circuit Short to Ground

DTC B0173 05

- Upper Left Duct Air Temperature Sensor Circuit High Voltage/Open

DTC B0178 02

- Lower Left Duct Air Temperature Sensor Circuit Short to Ground

DTC B0178 05

- Lower Left Duct Air Temperature Sensor Circuit High Voltage/Open

DTC B0509 02

- Upper Right Duct Air Temperature Sensor Circuit Short to Ground

DTC B0509 05

- Upper Right Duct Air Temperature Sensor Circuit High Voltage/Open

DTC B0514 02

- Lower Right Duct Air Temperature Sensor Circuit Short to Ground

DTC B0514 05

- Lower Right Duct Air Temperature Sensor Circuit High Voltage/Open

DTC B0519 02

- Rear Upper Duct Air Temperature Sensor Circuit Short to Ground

DTC B0519 05

- Rear Upper Duct Air Temperature Sensor Circuit High Voltage/Open

DTC B3583 02

- Rear Lower Duct Air Temperature Sensor Circuit Short to Ground

DTC B3583 05

- Rear Lower Duct Air Temperature Sensor Circuit High Voltage/Open

DTC B3933 02

- Air Conditioning Evaporator Temperature Sensor Circuit Short to Ground

DTC B3933 05

- Air Conditioning Evaporator Temperature Sensor Circuit High Voltage/Open

Circuit/System Description

The air temperature sensors are a 2-wire negative temperature co-efficient thermistor. The vehicle uses the following air temperature sensors:

* Air temperature sensor - left upper

* Air temperature sensor - left lower

* Air temperature sensor - right upper

* Air temperature sensor - right lower

* Air temperature sensor - rear upper (only with CJ4)

* Air temperature sensor - rear lower (only with CJ4)

* A/C evaporator temperature sensor

A signal and low reference circuit enables the sensor to operate. As the air temperature surrounding the sensor increases, the sensor resistance

decreases. The sensor signal voltage decreases as the resistance decreases. The sensor operates within a temperature range between -40 to +85掳C

(-40 to +185掳F). The sensor signal varies between 0-5 V. The HVAC control module converts the signal to a range between 0-255 counts. As the

air temperature increases the count value will decrease. If the HVAC control module detects a malfunctioning sensor, then the control module