P0A2D

DTC P0A2B-P0A2D or P0A31-P0A33

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

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 (MTS) is part of the motor assembly. The MTS 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 (MCM) supplies a 5-volt 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 MCM 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

DTC P0A2B and DTC P0A31
* DTCs P0A2F, P0AEF, P0AF0, P0BD3, P0BD4, P0BDD, P0BDE are not set.
* Engine has been OFF for at least 8 hours.
* Average of phase A, B, C inverter temperature is above -7°C (19°F).
* Motor temperature is above -7°C (19°F).

DTC P0A2C and P0A32

The motor has been commanded to more than 50 N.m of torque for an accumulated time of 5 minutes.

DTC P0A2D and P0A33

The ignition is ON.

Conditions for Setting the DTC

DTC P0A2B and DTC P0A31
* The average of the three motor phase sensor temperatures and the motor temperature are not within 20°C (38°F) of each other at ignition ON.
* The DTC sets within 1 second when the above condition is met.

DTC P0A2C and P0A32
* Motor temperature is below -40°C (-40°F)
* The DTC sets within 1.04 seconds when the above condition is met.

DTC P0A2D and P0A33
* Motor temperature is above 230°C (446°F).
* The DTC sets within 1.04 seconds when the above condition is met.

Action Taken When the DTC Sets

* DTCs P0A2B-P0A2D, P0A31-P0A33 are Type B DTCs.
* The HPCM commands the service hybrid system message to display on the instrument panel.

Conditions for Clearing the DTC

DTCs P0A2B-P0A2D, P0A31-P0A33 are Type B 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.

Special Tools

DT 48493 Jumper Harness (24 pins)

Circuit/System Verification

1. Allow the vehicle to cool to ambient temperature by leaving the ignition OFF for 8 or more hours.
2. Ignition ON, observe Motor 1 temperature, Motor 2 temperature, and phase A, B C inverter temperature parameters.

^ The Motor 1 Temperature, Motor 2 Temperature, and phase A, B, C inverter temperature parameters should be within 15°C (27°F) of each other and ambient temperature.

Circuit/System Testing

1. Ignition OFF, disconnect the transmission 24-way harness connector.
2. Ignition OFF, test the harness side for less than 5 ohms of resistance between the low reference circuit terminal and ground.

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

3. Ignition ON, verify the scan tool motor temperature sensor parameter is below -39°C (-38°F).

^ If greater than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the MCM.

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 greater than 212°C (414°F).

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

^ If less 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 HCM.

5. Connect the DT 48493 jumper harness to the transmission 24-way connector. 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.

^ If the resistance is near the expected value, test the signal circuit for a short to ground. If the circuit tests normal, replace the motor temperature sensor.
^ If the resistance is not near the expected value, test the signal and low reference circuits for an open or shorted together condition. If the circuits test normal, replace the motor temperature sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Wiring Harness Replacement
* Motor Temperature Sensor (MTS) Replacement. Refer to Drive Motor w/Generator 1 Replacement or Drive Motor w/Generator 2 Replacement.