P0A2F

DTC P0A2F

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 P0A2F
- Drive Motor 1 Overtemperature

Circuit/System Description

The transmission contains two electric motor/generators. The drive motor generators are cooled by the transmission fluid. Hot fluid exits the drive motor generator housing and flows to the transmission cooler supply line. The supply line connects to the cooler, which is in the radiator. From the cooler, the fluid returns through the oil cooler return line and enters the lubrication circuits. After lubricating the internal components, the fluid returns to the oil pan. A motor temperature sensor (MTS) is located in each drive motor generator assembly.

Conditions for Running the DTC

DTCs P0A2C and P0A2D are not set.

Conditions for Setting the DTC

The MTS is greater than 200°C (392°F) for 3.13 seconds.

Action Taken When the DTC Sets

* DTC P0A2F is a Type B DTC.
* The hybrid powertrain control module (HPCM) commands the battery energy control module (BECM) to open the high voltage contactor relays.

Conditions for Clearing the DTC

DTC P0A2F is a Type B DTC.

Diagnostic Aids

The driver information center (DIC), if equipped, will display 'TRANSMISSION HOT- Idle Engine' when the transmission fluid temperature (TFT) is more than 132°C (270°F) for 10 minutes. Ask about the customer's driving habits, trailer towing, etc. Ensure the engine cooling system is functioning normally.

Circuit/System Verification

1. Review the Failure Records when the DTC set.

^ If the engine coolant temperature (ECT) was above 125°C (257°F) when the DTC set, go to Symptoms - Cooling System and correct that concern first. Symptom Related Diagnostic Procedures

2. Perform the Transmission Fluid Cooler Flushing and Flow Test (J 45096). Symptom Related Diagnostic Procedures

Circuit/System Testing

1. Review the Failure Records when the DTC set.
2. Compare the MTS values for each drive motor generator.

^ If both MTS values were not at or near 200°C (392°F), test the MTS signal circuit for a low resistance to ground condition. If the circuit tests normal, replace the motor temperature sensor.

3. Inspect the transmission cooling system for restrictions or damage.

^ If a concern is found, repair or replace the restricted or damaged components as necessary.

4. Perform the Transmission Fluid Cooler Flushing and Flow Test (J 45096). Symptom Related Diagnostic Procedures

^ If a concern is found, repair or replace the damaged components as necessary.

5. Perform the automatic transmission Line Pressure Check.

^ If a concern is found repair or replace the damaged components as necessary.

Component Testing

* Perform the Fluid Leak Diagnosis.
* Perform the Transmission Fluid Check procedure. Symptom Related Diagnostic Procedures
* Perform the Line Pressure Check procedure. Symptom Related Diagnostic Procedures

Repair Instructions

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

* Drive motor generator 1 temperature sensor. Refer to Drive Motor with Generator Assembly Removal - 1st Position.
* Automatic transmission wiring harness assembly. Refer to Transmission Control Wiring Harness Extension Harness Removal.