2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2581

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2581

* It may be possible to locate the fault by disconnecting one component at a time from the affected 5-volt reference circuit while viewing the

5-Volt Reference Circuit Status parameter on the scan tool. The scan tool parameter will change from Fault to OK when the source of the

fault is disconnected. If all 5-volt reference components have been disconnected and a fault is still indicated, the fault may exist in the wiring

harness.

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)

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, observe the scan tool 5-volt reference 1 and 2 circuit status parameters. The parameters should display OK.

4. Ignition ON, observe the DTC information with a scan tool. DTC P0641 and P0651 should not set on this ignition cycle.

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

Note: A short to voltage on the signal circuit of certain components may cause this DTC to set.

1. Ignition OFF, disconnect the harness connector of all appropriate sensors for the applicable DTC. Refer to Diagnostic Aids for the

appropriate sensors.

2. Ignition ON, measure for 4.8-5.2 V between one of the 5-volt reference circuits and ground.

瀚慖f less than the specified range, test for a short to ground on the 5-volt reference circuit for each affected component. If all circuits test

normal, replace the K20 ECM.

瀚慖f greater than the specified range, test for a short to voltage on the 5-volt reference circuit for each affected component. If all circuits test

normal, replace the K20 ECM.

3. Connect each component associated with the 5-volt reference circuit, one at a time, while monitoring the voltage. Verify the voltage remains

between 4.8-5.2 V.

瀚慖f not within the specified range when a component is connected, test the signal circuit for a short to voltage. If the circuit tests normal,

replace the component.

Repair Instructions

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

* Accelerator Pedal Position Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Accelerator Pedal Position