2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1185

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1185

control module.

3. Ignition ON, verify the scan tool DMCM Coolant Temperature parameter is greater than 162掳C (323.6掳F).

瀚慖f less than the specified range, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the engine

control module.

4. Install a 3 A fused jumper wire between the signal circuit terminal B and ground. Verify the scan tool DMCM Coolant Temperature

parameter is less than -60.5掳C (-76.9掳F).

瀚慖f greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal,

replace the engine control module.

5. If all circuits test normal, test or replace the generator control module temperature sensor.

Component Testing

Temperature Sensor Test

Note: A thermometer can be used to test the sensor off vehicle in heated water.

1. Test the generator control module coolant temperature sensor by varying the sensor temperature while monitoring the sensor resistance.

2. Compare the readings with the Temperature Versus Resistance ().

瀚慖f not within the specified range, replace the generator control module coolant temperature sensor.

Repair Instructions

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

* Coolant Temperature Sensor Replacement (Generator Control Module) ()

* Control Module References (See: Testing and Inspection/Programming and Relearning) for engine control module replacement, setup, and

programming

P0A1B

DTC P0A1B or P0A1C

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 P0A1B

- Drive Motor 1 Control Module Performance

DTC P0A1C

- Drive Motor 2 Control Module Performance

Circuit/System Description

This is a fault detection of the Drive Motor Generator Power Inverter Modules' (PIM) internal Motor Control Module (MCM). This fault is handled

inside the PIM and no external circuits are involved. The MCMs are located within the PIM and are not serviced separately.

Conditions for Running the DTC

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

* Ignition voltage is 8-18V.

Conditions for Setting the DTC

The control module has detected an internal malfunction.