P1AB1

DTC P1AB1

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 P1AB1
- Starter/Generator Phase U-V-W Current Sensor Overcurrent

Circuit/System Description

The starter/generator control module (SGCM) monitors the phase U/V/W current sensor to detect 3 phase overcurrent and to protect the MOSFET.

Conditions for Running the DTC

* Engine is running.
* Wake up signal is ON.

Conditions for Setting the DTC

Over current signal set for 20 ms.

Action Taken When the DTC Sets

* Stop PWM (MGU shutdown)
* APM PWM OFF
* Battery disconnection (disconnect SW on/off)

Conditions for Clearing the DTC

Over current signal not valid

Diagnostic Aids

* Possible MGU winding short to other winding or short to case
* Possible FET breakdown or gate driver circuit 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)

DTC Type Reference

Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle)
Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the 3-phase cables from the SGCM. Refer to Generator Control Module 3-Phase Cable Assembly Replacement (Generator Control Module 3-Phase Cable Assembly Replacement).
2. Ignition OFF, test for infinite resistance between each of the 3-phase cables and ground.

• If not the specified value, disconnect the MGU and test the appropriate 3-phase cable for a short to ground. If a short to ground is found, replace the 3-phase cables. If the cable tests normal, replace the MGU.

3. If all circuits test normal, replace the SGCM.

Repair Instructions

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

* Generator Control Module 3-Phase Cable Assembly Replacement (Generator Control Module 3-Phase Cable Assembly Replacement)
* Generator with Starter Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for SGCM replacement, setup, and programming