2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2204

2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2204

Repairs/Wiring Repairs)

Circuit/System Verification

1. Clear the DTC information.

2. Ignition OFF for 1 minute.

3. Ignition ON.

4. Retest for DTCs P0642, P0643, P0652 and P0653.

Circuit/System Testing

1. Clear the DTC and operate the vehicle under the condition for running and setting the DTC.

2. Shut the ignition OFF for 30 seconds, and verify that the DTC does not reset.

瀚慖f the DTC resets, replace the Drive Motor Generator Power Inverter Module Assembly (PIM).

Repair Instructions

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

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

P0643

DTC P0642, P0643, P0652, or P0653

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 P0642

- 5 Volt Reference 1 Circuit Low Voltage

DTC P0643

- 5 Volt Reference 1 Circuit High Voltage

DTC P0652

- 5 Volt Reference 2 Circuit Low Voltage

DTC P0653

- 5 Volt Reference 2 Circuit High Voltage

Circuit/System Description

The drive motor generator power inverter module (PIM) contains two motor control modules (MCM) and a hybrid powertrain control module

(HPCM). Each MCM utilizes a 5 Volt reference power supply for internal circuit needs. This fault is handled inside the PIM and no external

circuits are involved.

Conditions for Running the DTC

* The control module runs the program to detect an internal fault when the key is ON.

* Ignition voltage is 8-18V.

Conditions for Setting the DTC

The control module has detected an internal malfunction.

Action Taken When the DTC Sets

* DTCs P0642, P0643, P0652 and P0653 are Type A DTCs.

* The PIM commands the battery energy control module (BECM) to open the high voltage contactor relays.