For 1990-2009 cars only
Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptor
DTC P0A3B: Starter/Generator OvertemperatureCircuit/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
Connector End View Reference
Description and Operation
Starter/Generator Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Perform the Hybrid Battery Service Disconnect/Connect.
- Inspect the connection of 3 phase cables for the proper torque. Refer to Fastener Tightening Specifications.
| ⇒ | If the 3 phase cables are within torque specifications, replace the MGU. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Generator with Starter Replacement for MGU replacement.
