2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1133

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1133

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

* Drive Motor Battery Current Sensor Replacement ()

* Drive Motor Battery Sensor Module Wiring Harness Replacement ()

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

replacement, setup and programming

P0AC1

DTC P0AC0, P0AC1, P0AC2, or P1A07

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 P0AC0

- Hybrid Battery Current Sensor Performance

DTC P0AC1

- Hybrid Battery Current Sensor Circuit Low Voltage

DTC P0AC2

- Hybrid Battery Current Sensor Circuit High Voltage

DTC P1A07

- Battery Energy Control Module 5-Volt Reference Circuit

Diagnostic Fault Information

Circuit/System Description

The hybrid battery current sensor is mounted inside the drive motor generator battery assembly. The positive high voltage cable that goes to the

positive contactor relay passes through the current sensor. The current sensor detects the amperage that flows in and out of the hybrid batteries. The

drive motor generator battery control module supplies and monitors a 5 V reference signal to the current sensor. The current sensor returns a signal

between 0 and 5 V to the drive motor generator battery control module. The current sensor signal is in proportion to the amperage going in and out

of the drive motor generator battery. A signal voltage of the current sensor greater than 2.5 V indicates that the drive motor generator battery is

being discharged and a signal voltage less than 2.5 V indicates charging. The hybrid battery current sensor has 3 measurement ranges in order to

maintain accuracy. The ranges are low, medium and high. The measurement ranges of the current sensor have some overlap with each other. The

low range measures from -22 to +22 A. The medium range measures from -52 to +52 A. The high range measures from -250 to +250 A.

Conditions for Running the DTC

* The ignition is ON.

* The 12 V battery is 9-18 V.

Conditions for Setting the DTC

P0AC0

One of the following conditions exists:

* The drive motor generator battery control module detects greater than 5 A on the current sensor after a successful high voltage system power

down and after the contactors have opened.

* The drive motor generator battery control module detects an increase in total pack voltage greater than 10 V and the current sensor measures

less than a 0.5 A increase.