P1A6D

DTC P1A6D or P1A6E

Diagnostic Instructions

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



DTC Descriptors
DTC P1A6D
- Starter/Generator Control Module System Voltage Low

DTC P1A6E
- Starter/Generator Control Module System Voltage High




Circuit/System Description

The starter/generator control module (SGCM) monitors the system voltage sensor to detect for a shorted low or high condition.


Conditions for Running the DTC


P1A6D, P1A6E
* The engine is running.
* Hybrid mode is active.



Conditions for Setting the DTC


P1A6D
* Sensor output voltage is less than 0.2 volt (30.0 volts).
* The 12-volt power supply - 12-volt output voltage is greater than 5 volts for 0.5 ms.



P1A6D
* Sensor output voltage is greater than 3.84 volt (1.56 volts).
* The 12-volt power supply - 12-volt output voltage is greater than 5 volts for 0.5 ms.



Action Taken When the DTC Sets

Hybrid system is disabled.


Conditions for Clearing the DTC

Wake up signal is ON.


Reference Information
Schematic Reference

Hybrid Controls Schematics ()
Connector End View Reference

Component Connector End Views (Connector Views)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for Scan Tool Information


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.


P1A6D, P1A6E

If DTC is current, replace the SGCM.


Repair Instructions

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


Control Module References (Programming and Relearning) for SGCM replacement, setup, and programming