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 P1A56: Hybrid System Voltage Discharge CircuitCircuit/System Description
The starter/generator control module (SGCM) monitors connector X2 terminals 15 and 16. When the connector is disconnected, the SGCM capacitors are electrically connected to a discharge resistor.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
36-volt output voltage greater than 10 volts and discharge resistance error signal is ON for 1 second.
Action Taken When the DTC Sets
Hybrid system is disabled.
Conditions for Clearing the DTC
Clears 30 seconds after cycle wakeup signal.
Diagnostic Aids
Possible cable open or SGCM internal problem.
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
- Ignition OFF, inspect the SGCM X2 harness connector for poor connections, bent terminals or corrosion.
- Reinstall SGCM X2.
- Ignition ON, with a scan tool, clear the DTC.
- Ignition OFF, wait 30 seconds.
- Ignition ON, operate the vehicle within the Conditions for Running the DTC and verify the DTC does not reset.
| ⇒ | If the DTC resets, replace the SGCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for SGCM replacement, setup, and programming
