P1A62

DTC P1A62

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

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 N.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

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.

1. Disconnect harness connector X2 from the SGCM.
2. Using the appropriate test adapters, test for 5-100 ohms between terminals 9 and 12.

^ If within the specified range, replace the SGCM.

3. Disconnect the 7 pin X1 connector at the MGU.
4. Test for less than 1 ohm between SGCM connector harness terminal 12 and the MGU connector harness terminal A.

^ If greater than the specified range, repair the open circuit.

5. Test for less than 1 ohm between SGCM connector harness terminal 9 and the MGU X1 connector harness terminal C.

^ If greater than the specified range, repair the open circuit.

6. If both circuits test normal, replace the MGU.

Repair Instructions

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

* Generator with Starter Replacement