P1A5A

DTC P1A5A

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 P1A5A
- Hybrid System Temperature

Circuit/System Description

The deviation of the temperature across the battery pack is checked using the 6 temperature sensors. If one module within the pack is bad, it should manifest itself in a high DeltaT.

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

If any of the following conditions exist:

* Module Temperature 1 a - Module Temperatures Average is greater than DeltaT Threshold, or
* Module Temperature 1 b - Module Temperatures Average is grater than DeltaT Threshold, or
* Module Temperature 2 a - Module Temperatures Average is greater than DeltaT Threshold, or
* Module Temperature 2 b - Module Temperatures Average is grater than DeltaT Threshold, or
* Module Temperature 3 a - Module Temperatures Average is greater than DeltaT Threshold, or
* Module Temperature 3 b - Module Temperatures Average is grater than DeltaT Threshold

Where DeltaT Threshold (In: Tpack, Out: temp threshold) =






Action Taken When the DTC Sets

Hybrid system is disabled.

Conditions for Clearing the DTC

The following conditions must be present:

* Battery module temperature 1 a = Valid
* Battery module temperature 1 b = Valid
* Battery module temperature 2 a = Valid
* Battery module temperature 2 b = Valid
* Battery module temperature 3 a = Valid
* Battery module temperature 3 b = Valid

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.

Caution: To help avoid personal injury, be careful when working in the vicinity of the generator battery disconnect control module. Internal components will still be live, 36V potential, even when the cover has been opened or removed.

1. If DTC is history, refer to Testing for Intermittent Conditions and Poor Connections in Diagnostic Aids. Component Tests and General Diagnostics
2. If DTC is current, replace the BECM.

Repair Instructions

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

Control Module References for BECM replacement, setup, and programming.