2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1387

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1387

DTCs P0480, P0691, and P0692 are Type B DTCs.

Diagnostic Aids

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

control command parameters on the scan tool to know when the fan is being commanded ON by the ECM.

Reference Information

Schematic Reference

Engine Cooling Schematics (See: Engine, Cooling and Exhaust/Cooling System/Diagrams)

Connector End View Reference

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

Description and Operation

Cooling Fan Description and Operation (LAU) (See: Engine, Cooling and Exhaust/Cooling System/Description and Operation/Cooling Fan

Description and Operation)Cooling Fan Description and Operation (LF1) (See: Engine, Cooling and Exhaust/Cooling System/Description and

Operation/Cooling Fan 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)

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) for scan tool information

Circuit/System Verification

Note: There is a slight delay before the cooling fans activate.

1. Ignition ON, command the cooling fan ON and OFF with a scan tool. The cooling fan should respond to the commanded states.

2. Observe the DTC information with a scan tool. DTC P0480, P0691, or P0692 should not set.

3. 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.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the K22 cooling fan control module.

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

瀚慖f the test lamp does not illuminate, test the ground circuit for an open/high resistance.

3. Ignition ON, verify that a test lamp illuminates between the B+ supply circuit terminal 1 and ground.

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

circuit fuse is open, test or replace the K22 cooling fan control module.

Note: The cooling fan speed control circuit is pulled-up to a voltage within the ECM, 3-4 volts on the control circuit is normal.

4. Test for 3-4 V between the control circuit terminal 4 and ground.

瀚慖f less than the specified range, test the control circuit for an open or a short to ground. If the circuit tests normal, replace the K20 ECM.

瀚慖f greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

5. Command the cooling fan ON and OFF with a scan tool. The DMM should transition from 3-4 V when commanded OFF to less than 1 V,

when commanded ON to greater than 70 %.