P0A92

DTC P0A92

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 P0A92
- Starter/Generator Performance

Circuit/System Description

The starter/generator control module (SGCM) monitors the drive belt connection between the engine and the motor generator unit (MGU). If belt slip is detected, the DTC will set.

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

The mechanical drive belt connection (belt slip) is detected.

Action Taken When the DTC Sets

The hybrid system is degraded.

Conditions for Clearing the DTC

* The diagnostic system has not been disabled.
* There are no crank sensor faults.
* There are no engine coolant temperature sensor faults.
* There are no mass air flow sensor faults.
* There are no intake air temperature sensor faults.
* There are no starter/generator temperature faults.
* There are no starter/generator position sensor faults.
* There are no starter/generator speed faults.
* There are no starter/generator torque delivered faults.

Diagnostic Aids

* Possible belt tension or tensioner problem.
* Verify with the customer the operating conditions when the concern occurred such as, driving the vehicle through deep water or though a car wash an underbody wash that may cause this fault.

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 Verification

1. Remove the engine drive belt.
2. Spin the MGU by hand. Verify MGU does not exhibit any coarseness or resistance when spinning.

• If any coarseness or resistance is noted when spinning the MGU by hand, replace the MGU and engine drive belt.

3. Visually inspect drive belt is not glazed or otherwise damaged.

• If the drive belt is glazed or damaged, refer to Drive Belt Replacement.

4. Perform the Drive Belt Tensioner Diagnosis.
5. If the engine drive belt and tensioner are within specifications, replace the MGU.

Repair Instructions

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