2010 Cadillac Truck Escalade RWD V8-6.2L Page 1479
Circuit/System Verification
1. Inspect for DTCs P0ABB, P0ABC, P0ABD, loss of communication with the BECM U-code DTCs, or any other concern that would indicate
high voltage to the PIM was interrupted while high current was present.
瀚慖f the specified DTCs are set, or high voltage interruption is suspected, diagnose them first. Refer to Diagnostic Trouble Code (DTC) List
- Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle).
2. Clear the DTC information.
3. Ignition OFF for 1 minute.
4. Ignition ON.
5. Retest for DTCs P1AEC, P1AED, P1AEE and P1AEF.
If the DTC resets, program the PIM with the latest software version and recheck for DTCs. If the DTC resets after programming or if the PIM
already contains the latest software version, replace the 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.
P1AEF
DTC P1AEC-P1AEF
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 Descriptors
DTC P1AEC
- Drive Motor 1 Control Module Hybrid Battery System Voltage
DTC P1AED
- Drive Motor 2 Control Module Hybrid Battery System Voltage
DTC P1AEE
- Drive Motor 1 Control Module Hybrid Battery System Voltage High
DTC P1AEF
- Drive Motor 2 Control Module Hybrid Battery System Voltage High
Circuit/System Description
The drive motor generator power inverter control module (PIM) contains two motor control modules (MCMs). Each MCM measures hybrid battery
high voltage with several internal sensors. The battery energy control module (BECM) also monitors high voltage with several internal sensors. The
BECM high voltage measurement is broadcast over GMLAN.
P1AEC and P1AED
The MCM compares the values in order to verify the hybrid battery high voltage measurement is accurate.
P1AEE and P1AEF
The MCM monitors for high voltage that is greater than the system allows during normal operation.
Conditions for Running the DTC
* The high voltage contactor relays are closed.
* Ignition voltage is 8-18V.
