2010 Cadillac Truck Escalade RWD V8-6.2L Page 1099
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Special Tools
DT-48493 Jumper Harness, 24 terminal
Circuit/System Verification
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
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Special Tools
DT-48493 Jumper Harness, 24 terminal
Circuit/System Verification
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
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