2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2579

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2579

Schematic Reference

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

Diagram/Instrument Cluster Schematics)

* Engine Controls Schematics (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/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

1. Ignition OFF, open the hood to disable the Auto-Stop function. Refer to Hybrid Modes of Operation Description ( See: Hybrid Drive

Systems/Description and Operation/Hybrid Modes of Operation).

2. Ignition ON, verify the scan tool hood position parameter displays Open.

瀚慖f the hood position does not display Open, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) for DTC P254F.

3. Ignition ON, command the MIL ON and OFF with a scan tool. The MIL should turn ON and OFF.

4. Engine idling, command the MIL ON and OFF with a scan tool while observing the following control circuit status parameters:

* MIL Circuit Short to Gnd Test Status

* MIL Circuit Open Test Status

* MIL Circuit Short to Voltage Test Status

Each parameter should toggle between OK and Not Run or Not Run and OK.

5. 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 ON, verify that the instrument panel cluster (IPC) warning indicators are illuminated.

瀚慖f the IPC warning indicators are not illuminated, test the ignition circuit for a short to ground or an open/high resistance. If the circuit

tests normal and the ignition circuit fuse is open, replace the IPC.

2. Ignition OFF, disconnect the harness connector X1 at the ECM.

3. Ignition ON, verify the MIL is not illuminated.

瀚慖f the MIL is illuminated, test the MIL control circuit for a short to ground. If the circuit tests normal, replace the IPC.

4. Connect a 3 A fused jumper wire between the MIL control circuit, terminal 12-X1, and ground. The MIL should illuminate.

瀚慖f the MIL does not illuminate, test the MIL control circuit for a short to voltage or an open/high resistance. If the circuit tests normal,

replace the IPC.

5. If all circuits test normal, replace the ECM.

Repair Instructions

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