2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1109

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1109

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

* Drive Motor Battery Negative High Voltage Contactor Relay Replacement ()

* Drive Motor Battery Positive High Voltage Contactor Relay Replacement ()

* Drive Motor Battery Positive and Negative Cable Replacement ()

* Drive Motor Generator Battery Replacement and Shipping Preparation ()

* Control Module References (See: Testing and Inspection/Programming and Relearning) for drive motor generator battery control

replacement, setup and programming

P0ABD

DTC P0ABB, P0ABC, or P0ABD

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 P0ABB

- Hybrid Battery Voltage Sensor Performance

DTC P0ABC

- Hybrid Battery Voltage Sensor Circuit Low Voltage

DTC P0ABD

- Hybrid Battery Voltage Sensor Circuit High Voltage

Diagnostic Fault Information

Circuit/System Description

The system contains twenty battery modules. Each module contains two 7.2 V cells for a total nominal system voltage of 288 V. Each battery

module is rated at 14.4 V direct current (DC) and all the modules are connected together in series. The drive motor generator battery is also referred

to as the hybrid battery.

The drive motor generator battery control module has several methods of monitoring the total voltage values of the hybrid batteries. The drive

motor generator battery control module monitors the calculated battery voltage and the terminal voltage. The calculated voltage represents the sum

of the voltages from the 20 individual battery measurements, and the terminal voltage represents the total DC bus voltage as measured on the output

side of the high voltage contactor. The drive motor generator battery control module compares these two voltage readings and looks for a

difference. The drive motor generator battery control module also monitors the terminal voltage for both over voltage and under voltage conditions.

Conditions for Running the DTC

* The ignition is ON.

* The 12 V battery voltage is 9-18 V.

* The high voltage contactors are closed.

Conditions for Setting the DTC

P0ABB

The drive motor generator battery control module detects a 50 V difference between the hybrid battery pack calculated voltage and the hybrid

battery terminal voltage for 7 seconds.