P0A3B

DTC P0A3B

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 Descriptor
DTC P0A3B
- Starter/Generator Overtemperature

Circuit/System Description

The starter/generator control module (SGCM) monitors the motor generator unit (MGU) temperature sensor for an overtemperature condition.

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

MGU temperature is greater than 205°C (401°F) for 1 second.

Action Taken When the DTC Sets

Stop PWM (MGU shutdown)

Conditions for Clearing the DTC

MGU temperature is less than 150°C (212°F) for 3 seconds.

Diagnostic Aids

Possible MGU fan failure caused by obstructions, blockage to the vents or damaged fan.

Reference Information
Schematic Reference

Hybrid Controls Schematics (Hybrid Controls Schematics)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

Starter/Generator Description and Operation (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)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Testing

1. Perform the Hybrid Battery Service Disconnect/Connect (Procedures).
2. Inspect the connection of 3 phase cables for the proper torque. Refer to Fastener Tightening Specifications (Specifications).

If the 3 phase cables are within torque specifications, replace the MGU.

Repair Instructions

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

Generator with Starter Replacement (Service and Repair) for MGU replacement.