* Test the X176 transmission 24-way connector for proper terminal contact whenever an open or high resistance circuit condition is observed.
* The HPCM motor temperature scan tool parameter display will default to 120锟斤拷C (248锟斤拷F) whenever an open or shorted signal circuit is
observed.
Reference Information
Schematic Reference
Hybrid Controls Schematics ()
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Drive Motor Generator Control Module Description and Operation ()
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* 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.
锟斤拷The Motor 1 Temperature, Motor 2 Temperature, and phase U, V, W inverter temperature parameters should be within 28锟斤拷C (50锟斤拷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.
锟斤拷If 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.
锟斤拷If 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.
锟斤拷If greater than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal,
