2010 Cadillac CTS Sedan AWD V6-3.6L Page 1611

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1611

* 30 and 85

* 85 and 87

瀚慖f less than the specified range, replace the KR20 cooling fan relay.

4. Test for less than 2 ohm between terminals 30 and 87A.

瀚慖f greater than the specified range, replace the KR20E cooling fan relay.

5. Connect a 20 A fused jumper wire between relay terminal 85 and B+. Connect a jumper wire between relay terminal 86 and ground. Test for

less than 2 ohm between terminals 30 and 87.

瀚慖f greater than the specified range, replace the KR20 cooling fan relay.

Repair Instructions

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

* Relay Replacement (Attached to Wire Harness) (See: Power and Ground Distribution/Power Distribution Relay/Service and Repair/Relay

Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (See: Power and Ground Distribution/Power

Distribution Relay/Service and Repair/Relay Replacement (Within an Electrical Center))

* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming

Dual Fan

DTC P0480, P0481, P0691, P0692, P0693, or P0694 (w/LLT and Dual Fan)

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 P0480

- Cooling Fan Relay 1 Control Circuit

DTC P0481

- Cooling Fan Relays 2 and 3 Control Circuit

DTC P0691

- Cooling Fan Relay 1 Control Circuit Low Voltage

DTC P0692

- Cooling Fan Relay 1 Control Circuit High Voltage

DTC P0693

- Cooling Fan Relays 2 and 3 Control Circuit Low Voltage

DTC P0694

- Cooling Fan Relays 2 and 3 Control Circuit High Voltage

Diagnostic Fault Information

Typical Scan Tool Data

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2893

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2893

* 30 and 85

* 85 and 87

瀚慖f less than infinite resistance, replace the Run/Crank relay.

4. Install a 20-amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test

for less than 2.0 ohms between terminals 30 and 87.

瀚慖f greater than 2.0 ohms, replace the Run/Crank relay.

Repair Instructions

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

* Relay Replacement (Attached to Wire Harness) (See: Power and Ground Distribution/Power Distribution Relay/Service and Repair/Relay

Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (See: Power and Ground Distribution/Power

Distribution Relay/Service and Repair/Relay Replacement (Within an Electrical Center))

* Control Module References (See: Testing and Inspection/Programming and Relearning) for FPCM replacement, setup, and programming

Wiring Systems and Power Management

DTC P2534

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 P2534

- Ignition 1 Switch Circuit Low Voltage

Diagnostic Fault Information

Circuit/System Description

The trailer brake control module monitors the ignition voltage circuit in order to determine if the voltage is within the normal operating range.

Conditions for Running the DTC

* Ignition ON.

* Battery voltage is 9.5-17 V.

* The module is powered up and completes initialization.

Conditions for Setting the DTC

The trailer brake control module detects that the ignition voltage is less than 6 V.

Action Taken When the DTC Sets

* The trailer brake control will be disabled for the remainder of the ignition cycle.

* The driver information center will display Service Trailer Brake System.

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.

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1456

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1456

* 30 and 85

* 85 and 87

瀚慖f less than the specified range, replace the KR20 cooling fan relay.

4. Test for less than 2 ohm between terminals 30 and 87A.

瀚慖f greater than the specified range, replace the KR20E cooling fan relay.

5. Connect a 20 A fused jumper wire between relay terminal 85 and B+. Connect a jumper wire between relay terminal 86 and ground. Test for

less than 2 ohm between terminals 30 and 87.

瀚慖f greater than the specified range, replace the KR20 cooling fan relay.

Repair Instructions

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

* Relay Replacement (Attached to Wire Harness) (See: Power and Ground Distribution/Power Distribution Relay/Service and Repair/Relay

Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (See: Power and Ground Distribution/Power

Distribution Relay/Service and Repair/Relay Replacement (Within an Electrical Center))

* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming

P0496

DTC P0496

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 P0496

- Evaporative Emission System Flow During Non-Purge

Circuit/System Description

This DTC tests for undesired intake manifold vacuum flow to the evaporative emission (EVAP) system. The engine control module (ECM) seals

the EVAP system by commanding the EVAP canister purge solenoid valve OFF and the EVAP canister vent solenoid valve ON. The ECM

monitors the fuel tank pressure (FTP) sensor to determine if a vacuum is being drawn on the EVAP system. If vacuum in the EVAP system is more

than a predetermined value within a predetermined time, this DTC sets.

The following table illustrates the relationship between the ON and OFF states, and the Open or Closed states of the EVAP canister purge and vent

solenoid valves.

Conditions for Running the DTC

* DTCs P0106, P0107, P0108, P0116, P0117, P0118, P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0442, P0443, P0446, P0449,

P0451, P0452, P0453, P0454, P0464, P0608, P0609, P0641, P0651, P1516, P2101, P2119, P2120, P2122, P2123, P2125, P2127, P2128,

P2135, P2138 are not set.

* The ignition voltage is between 11-18 V.

* The barometric pressure (BARO) is more than 74 kPa.

* The fuel level is between 15-85 %.

* The engine coolant temperature (ECT) is less than 35掳C (95掳F).

* The intake air temperature (IAT) is between 4-30掳C (39-86掳F).

* DTC P0496 runs once per cold start when the above conditions are met.

Conditions for Setting the DTC

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1625

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1625

* 30 and 85

* 85 and 87

瀚慖f less than the specified range, replace the KR20 cooling fan relay.

4. Test for less than 2 ohm between terminals 30 and 87A.

瀚慖f greater than the specified range, replace the KR20E cooling fan relay.

5. Connect a 20 A fused jumper wire between relay terminal 85 and B+. Connect a jumper wire between relay terminal 86 and ground. Test for

less than 2 ohm between terminals 30 and 87.

瀚慖f greater than the specified range, replace the KR20 cooling fan relay.

Repair Instructions

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

* Relay Replacement (Attached to Wire Harness) (See: Power and Ground Distribution/Power Distribution Relay/Service and Repair/Relay

Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (See: Power and Ground Distribution/Power

Distribution Relay/Service and Repair/Relay Replacement (Within an Electrical Center))

* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming

P0697

DTC P0641-P0643, P0651-P0653, or P0697-P0699 (ECM, LLT)

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 P0641

- 5 V Reference 1 Circuit

DTC P0642

- 5 V Reference 1 Circuit Low Voltage

DTC P0643

- 5 V Reference 1 Circuit High Voltage

DTC P0651

- 5 V Reference 2 Circuit

DTC P0652

- 5 V Reference 2 Circuit Low Voltage

DTC P0653

- 5 V Reference 2 Circuit High Voltage

DTC P0697

- 5 V Reference 3 Circuit

DTC P0698

- 5 V Reference 3 Circuit Low Voltage

DTC P0699

- 5 V Reference 3 Circuit High Voltage

Circuit/System Description

The engine control module (ECM) has 3 5 V reference circuits. The ECM provides the 5 V reference to various sensors. Each reference circuit

provides a 5 V reference for more than one sensor. An open, short to ground, or short voltage on one of the 5 V reference circuits can affect all the

components connected to that 5 V reference circuit. The ECM monitors the voltage on the 5 V reference circuits.

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1618

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1618

* 30 and 85

* 85 and 87

瀚慖f less than the specified range, replace the KR20 cooling fan relay.

4. Test for less than 2 ohm between terminals 30 and 87A.

瀚慖f greater than the specified range, replace the KR20E cooling fan relay.

5. Connect a 20 A fused jumper wire between relay terminal 85 and B+. Connect a jumper wire between relay terminal 86 and ground. Test for

less than 2 ohm between terminals 30 and 87.

瀚慖f greater than the specified range, replace the KR20 cooling fan relay.

Repair Instructions

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

* Relay Replacement (Attached to Wire Harness) (See: Power and Ground Distribution/Power Distribution Relay/Service and Repair/Relay

Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (See: Power and Ground Distribution/Power

Distribution Relay/Service and Repair/Relay Replacement (Within an Electrical Center))

* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming

Dual Fan

DTC P0480, P0481, P0691, P0692, P0693, or P0694 (w/LLT and Dual Fan)

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 P0480

- Cooling Fan Relay 1 Control Circuit

DTC P0481

- Cooling Fan Relays 2 and 3 Control Circuit

DTC P0691

- Cooling Fan Relay 1 Control Circuit Low Voltage

DTC P0692

- Cooling Fan Relay 1 Control Circuit High Voltage

DTC P0693

- Cooling Fan Relays 2 and 3 Control Circuit Low Voltage

DTC P0694

- Cooling Fan Relays 2 and 3 Control Circuit High Voltage

Diagnostic Fault Information

Typical Scan Tool Data