2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1228

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1228

P0A2B and P0A31

1. Allow the vehicle to cool to ambient temperature by leaving the ignition OFF for 6 or more hours.

2. Ignition ON, observe Motor 1 temperature, Motor 2 temperature, and phase U, V, W inverter temperature scan tool parameters.

瀚慣he Motor 1 Temperature, Motor 2 Temperature, and phase U, V, W inverter temperature parameters should be within 28掳C (50掳F) of

each other and ambient temperature.

P0A2C, P0A2D, P0A32, and P0A33

Ignition ON, observe the MCM motor temperature scan tool parameter.

The motor temperature parameter should be between 0.29V and 4.42V.

Circuit/System Testing

1. Ignition OFF, disconnect the transmission X176 24-way harness connector.

Important: The ignition must be ON to test the low reference circuit. Other DTCs will set with the X176 connector disconnected.

2. Ignition ON, test the vehicle harness side for less than 8 ohms between the low reference circuit terminal and ground.

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the PIM.

3. Ignition ON, verify the scan tool motor temperature sensor parameter is greater than 4.42V.

瀚慖f less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the PIM.

4. Install a 3-amp fused jumper wire between the signal circuit terminal and the low reference circuit terminal. Verify the scan tool motor

temperature sensor parameter is less than 0.29V.

Important: If a short to voltage is found, test the motor temperature sensor for damage.

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

replace the PIM.

5. Connect the DT-48493 to the X176 transmission 24-way connector at the transmission. Measure and record the resistance between the sensor

signal and low reference terminals. Compare the actual sensor and circuit resistance to the expected sensor resistance. Refer to Temperature

Versus Resistance ().

瀚慖f the resistance is near the expected value, test the transmission internal harness signal circuit for a short to ground. If the circuit tests

normal, replace the drive motor w/generator.

瀚慖f the resistance is not near the expected value, test the transmission internal harness signal and low reference circuits for an open or

shorted together condition. If the circuits test normal, replace the drive motor w/generator.

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

* Transmission Control Wiring Harness Extension Harness Removal (See: Transmission and Drivetrain/Automatic

Transmission/Transaxle/Service and Repair/Overhaul/2ML70 - Automatic Transmission/5. Transmission Control Wiring Harness Extension

Harness Removal)

* Drive Motor with Generator Assembly Removal - 1st Position (See: Transmission and Drivetrain/Automatic

Transmission/Transaxle/Service and Repair/Overhaul/2ML70 - Automatic Transmission/8. Drive Motor with Generator Assembly Removal -

1st Position)

* Drive Motor with Generator Assembly Removal - 2nd Position (See: Transmission and Drivetrain/Automatic

Transmission/Transaxle/Service and Repair/Overhaul/2ML70 - Automatic Transmission/13. Drive Motor with Generator Assembly Removal

- 2nd Position)

P0A33

DTC P0A2B-P0A2D or P0A31-P0A33

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.