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
