P0A2D
DTC P0A2B-P0A2D or P0A31-P0A33
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P0A2B
- Drive Motor 1 Temperature Sensor Performance
DTC P0A2C
- Drive Motor 1 Temperature Sensor Circuit Low Voltage
DTC P0A2D
- Drive Motor 1 Temperature Sensor Circuit High Voltage
DTC P0A31
- Drive Motor 2 Temperature Sensor Performance
DTC P0A32
- Drive Motor 2 Temperature Sensor Circuit Low Voltage
DTC P0A33
- Drive Motor 2 Temperature Sensor Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The motor temperature sensor is a non-serviceable part of the power inverter module, often referred to as the drive motor generator assembly. The motor temperature sensor is a thermistor, or a resistor that changes value when the temperature changes. The sensor has a negative-temperature coefficient. This means that as the temperature increases, the resistance decreases, and as the temperature decreases, the resistance increases. The motor control module supplies a 5 V reference signal to the sensor and measures the voltage drop in the circuit. When the motor is cold, the sensor resistance is high and the motor control module detects high signal voltage. As the motor temperature increases, the resistance of the sensor decreases, which lowers the signal voltage.
Conditions for Running the DTC
P0A2B and P0A31
* DTC P0A2C-P0A2D, P0A32, P0A33, P0AEF, or P0AF0 is not set.
* The Propulsion System Inactive time is greater than 6 hours, the Charge Off time is greater than 2 hours and the Thermal Conditioning Off time is greater than 2 hours.
* The transmission and power inverter module temperature is greater than -40°C (-40°F).
* The vehicle is ON or the power inverter module is awake.
* Drive motor temperature is greater than -20°C (-4°F).
* Transmission Fluid Temperature is valid.
P0A2C and P0A32
Vehicle is ON or the power inverter module is awake.
P0A2D and P0A33
Vehicle has been driven for at least 90 seconds.
Conditions for Setting the DTC
P0A2B and P0A31
The Motor temperature is more than 20°C (36°F) greater than the average of the Transmission Fluid Temperature and the power inverter module temperatures.
P0A2C and P0A32
Motor temperature sensor signal is greater than 184°C (363°F) for 3 seconds.
P0A2D and P0A33
Motor temperature sensor signal is less than -41°C (-42°F) when drive motor generator torque is greater than 20 Nm (15 lb ft) for 90 seconds.
Action Taken When the DTC Sets
DTCs P0A2B-P0A2D, P0A31-P0A33 are Type A DTCs.
Conditions for Clearing the DTC
DTCs P0A2B-P0A2D, P0A31-P0A33 are Type A DTCs.
Diagnostic Aids
* The motor temperature sensor can be damaged by excessive electric current. Test the sensor for an open condition whenever a short to voltage condition is observed.
* Test the X175 transmission 20-way connector for proper terminal contact whenever an open or high resistance circuit condition is observed.
Reference Information
Schematic Reference
Hybrid Controls Schematics Hybrid Controls Schematics
Connector End View Reference
Component Connector End Views Hybrid/EV Battery Pack X1
Description and Operation
Drive Motor Generator Power Inverter Module Description and Operation Drive Motor Generator Power Inverter Module Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Programming and Relearning for scan tool information
Special Tools
DT-44152 - Jumper Harness, 20 terminal
For equivalent regional tools, refer to Special Tools Tools and Equipment.
Circuit/System Verification
P0A2B and P0A31
1. Allow the vehicle to cool to ambient temperature by leaving the vehicle OFF and not connected to a charger for at least 6 hours.
2. Vehicle ON, observe Motor 1 temperature, Motor 2 temperature, Transmission Fluid Temperature and Power Inverter Module Temperature scan tool parameters.
• All temperature parameters should be within 28°C (50°F) of each other and ambient temperature.
P0A2C, P0A2D, P0A32, and P0A33
Vehicle ON, observe the motor control modules motor temperature scan tool parameter.
The motor temperature parameter should be between -41 and 184°C (-42 and 363°F).
Circuit/System Testing
1. Vehicle OFF, disconnect the transmission X175 20-way harness connector.
Note: The vehicle must be ON to test the low reference circuit. Other DTCs will set with the X175 connector disconnected.
2. Connect DT-44152 - jumper harness to the vehicle harness side only.
3. Vehicle ON, test the jumper harness side for less than 8 ohms between the low reference circuit terminals listed below and ground for the appropriate drive motor generator:
* Drive motor 1 low reference circuit terminal S
* Drive motor 2 low reference circuit terminal H
• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the T6 power inverter module.
4. Vehicle ON, verify the scan tool motor temperature sensor parameter is less than -41°C (-42°F).
• If more than the specified value, test the motor temperature sensor signal circuit for a short to ground. If the circuit tests normal, replace the T6 power inverter module.
5. Install a 3-amp fused jumper wire between the signal circuit terminal and the low reference circuit terminal listed below for the appropriate drive motor generator. Verify the scan tool motor temperature sensor parameter is greater than 184°C (363°F):
* Drive motor 1 terminals K and S
* Drive motor 2 terminals J and H
Note: If a short to voltage is found, test the motor temperature sensor for an open circuit or physical damage.
• If less 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 T6 power inverter module.
6. Vehicle OFF, connect the DT-44152 - jumper harness to the X175 transmission 20-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 [1][2]Power Control System, Hybrid Drive.
• If 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 M15 drive motor.
• If 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 M15 drive motor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Control Valve Body Cover Removal 3. Control Valve Body Cover Removal for Wiring Harness Extension Harness replacement
* Drive Motor Generator Rotor and Stator Removal - Unit A 11. Drive Motor Generator Rotor and Stator Removal - Unit A for Drive Motor 1 replacement
* Control Module References Programming and Relearning for Drive Motor Generator Power Inverter Module, also called the power inverter module, replacement, programming, and setup