2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1969

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 1969

瀚慖f greater than the specified range, replace the hood ajar switch.

4. With the switch in the hood open position, test for infinite resistance between the ground terminal C and the signal terminal B.

瀚慖f not infinite, replace the hood ajar switch.

5. Test for less than 2.0 ohms between the ground terminal C and the signal terminal A.

瀚慖f greater than the specified range, replace the hood ajar switch.

Repair Instructions

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

* Hood Primary and Secondary Latch Replacement (See: Body and Frame/Doors, Hood and Trunk/Hood/Hood Latch/Service and Repair)

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

P279D

DTC P279D

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 P279D

- Four Wheel Drive (4WD) Range Signal Circuit

Circuit/System Description

The hybrid powertrain control module (HPCM) monitors the state of the 4WD range signal message, if equipped, over the GMLAN communication

bus. The HPCM uses this message to determine motor torque required and transmission shifting, there are no external circuits involved.

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

The HPCM has detected a 4WD range signal rolling count error for 8 seconds.

Action Taken When the DTC Sets

DTC P279D is a Type A DTC.

Conditions for Clearing the DTC

* DTC P279D is a Type A DTC.

* When attempting to set HPCM internal DTCs, run the engine for at least 1 minute, and then shut the engine off for 30 seconds. Following

this procedure will allow for a complete HPCM shutdown. Program the HPCM with the latest software version and retest the DTC to see if

the DTC resets.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Diagrams)

Connector End View Reference

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

Electrical Information Reference