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 Descriptors
DTC P1A63: Starter/Generator Control Module Internal CircuitDTC P1A69: Starter/Generator Control Module Random Access Memory (RAM)
DTC P1A6A: Starter/Generator Control Module Read Only Memory (ROM)
DTC P1A6B: Starter/Generator Control Module 5 Volt Reference Circuit
Circuit/System Description
The starter/generator control module (SGCM) monitors to detect internal faults. If a fault is detected, the appropriate DTC will set.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
P1A63
The gate driver voltage fault signal is low or PWM logic error fault signal is low.
P1A69
RAM check error
P1A6A
RAM check error (calculated ROMSUM value does not match with defined value).
P1A6B
5-volt reference fault, 5-volt input AD value (2 byte) is out of the range for 100 ms.
Action Taken When the DTC Sets
P1A63, P1A69, P1A6A, P1A6B
| • | Stop PWM (MGU shutdown) |
| • | APM PWM Off |
Conditions for Clearing the DTC
P1A63, P1A69, P1A6A, P1A6B
Clears 30 seconds after cycle wake up signal
Diagnostic Aids
P1A63, P1A69, P1A6A, P1A6B
Possible electrical failure at SGCM
Reference Information
Schematic Reference
Connector End View Reference
Hybrid Controls Connector End Views
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Caution: To help avoid personal injury, additional precautions must be taken prior to working on the generator control module or the generator starter. After removing the 36V battery cables from the generator battery, remove both engine wiring harness connectors from the generator control module. Wait at least 5 minutes and then remove the generator control module cover. Verify voltage levels at all 36V, 12V, and 3-phase connections, are less than 3 volts using a DMM before proceeding.
- Verify that the latest software version is installed in the SGCM.
- Replace the SGCM.
| ⇒ | If not the latest version, reprogram SGCM. 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
