Diagnostic Instructions
DTC Descriptor
DTC P1A62: Starter/Generator Control Module Torque Delivered Performance
Circuit/System Description
The starter/generator control module (SGCM) monitors the internal torque value and compares it to the motor generator unit (MGU) delivered torque value. If the delivered torque is not within tolerance, the DTC will set.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
Torque error is greater than 10 NĀ·m for 1 second.
Action Taken When the DTC Sets
Delivered torque (CAN data) = command torque.
Conditions for Clearing the DTC
Normal range for 1 second
Reference Information
Schematic Reference
Hybrid Controls Schematics
Connector End View Reference
Hybrid Controls Connector End Views
Electrical Information Reference
Scan Tool Reference
Scan Tool Data List
Circuit/System Testing
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.
- Disconnect harness connector C2 from the SGCM. Refer to
Generator Control Module Replacement
.
- Using the appropriate test adapters, test for 5-100 ohms resistance between terminals 9 and 12.
ā | If within the specified range, replace the SGCM. |
- Disconnect the 7 pin C1 connector at the MGU. Refer to
Generator with Starter Replacement
.
- Test for less than 1 ohm between SGCM connector harness terminal 12 and the MGU connector harness terminal A.
ā | If greater than the specified range, repair the open circuit. |
- Test for less than 1 ohm between SGCM connector harness terminal 9 and the MGU C1 connector harness terminal C.
ā | If greater than the specified range, repair the open circuit. |
- If both circuits test normal, replace the MGU.
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.