P0A9E

DTC P0A9D, P0A9E, P0AC7, P0AC8, P0ACC, P0ACD, P0AEA, P0AEB, P1A1A, P1A1B, P1A1D, or P1A1E

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 Descriptors

DTC P0A9D
- Hybrid Battery 1 Temperature Sensor Circuit Low Voltage

DTC P0A9E
- Hybrid Battery 1 Temperature Sensor Circuit High Voltage

DTC P0AC7
- Hybrid Battery 2 Temperature Sensor Circuit Low Voltage

DTC P0AC8
- Hybrid Battery 2 Temperature Sensor Circuit High Voltage

DTC P0ACC
- Hybrid Battery 3 Temperature Sensor Circuit Low Voltage

DTC P0ACD
- Hybrid Battery 3 Temperature Sensor Circuit High Voltage

DTC P0AEA
- Hybrid Battery 4 Temperature Sensor Circuit Low Voltage

DTC P0AEB
- Hybrid Battery 4 Temperature Sensor Circuit High Voltage

DTC P1A1A
- Hybrid Battery 5 Temperature Sensor Circuit Low Voltage

DTC P1A1B
- Hybrid Battery 5 Temperature Sensor Circuit High Voltage

DTC P1A1D
- Hybrid Battery 6 Temperature Sensor Circuit Low Voltage

DTC P1A1E
- Hybrid Battery 6 Temperature Sensor Circuit High Voltage

Circuit/System Description

Each battery module has a separate temperature sensor, or thermistor. These sensors are serviced as a pair (one pair for each battery cassette). The battery cassette must be removed from the vehicle in order to access the thermistors. These sensors receive power and provide a battery temperature feedback signal to the battery energy control module (BECM), through the generator battery temperature sensor wiring harness.

The battery temperature sensor is a 2-wire 10 kohm thermistor. The BECM supplies 5 volts and a low reference circuit to determine battery temperature.

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

P0A9D, P0AC7, P0ACC, P0AEA, P1A1A, P1A1D

Temperature sensor less than 0.5 volt.

P0A9E, P0AC8, P0ACD, P0AEB, P1A1B, P1A1E

Temperature sensor greater than 4.5 volts.

Action Taken When the DTC Sets

The hybrid system is disabled.

Conditions for Clearing the DTC

P0A9D, P0A9E, P0AC7, P0AC8, P0ACC, P0ACD, P0AEA, P0AEB, P1A1A, P1A1B, P1A1D, P1A1E

The affected battery temperature sensor returns to a normal range.

Circuit/System Verification

P0A9D, P0AC7, P0ACC, P0AEA, P1A1A, P1A1D

With a scan tool observe the battery temperature sensor parameter for the affected sensor. The parameter should display greater than 0.5 volt.

P0A9E, P0AC8, P0ACD, P0AEB, P1A1B, P1A1E

With a scan tool observe the battery temperature sensor parameter for the affected sensor. The parameter should display less than 4.6 volts.

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.

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.

Important: Use the following list to identify the appropriate terminals to test:

* DTC P0A9D - P0A9E - Battery 1A Temperature Sensor Terminals 3 and 4
* DTC P0AC7 - P0AC8 - Battery 1B Temperature Sensor Terminals 5 and 6
* DTC P0ACC - P0ACD - Battery 2A Temperature Sensor Terminals 7 and 8
* DTC P0AEA - P0AEB - Battery 2B Temperature Sensor Terminals 13 and 14
* DTC P0A1A - P0A1B - Battery 3A Temperature Sensor Terminals 15 and 16
* DTC P0A1D - P0A1E - Battery 3B Temperature Sensor Terminals 17 and 18

1. Ignition OFF, disconnect harness connector C1 from the BECM. Refer to.

Important: The following test must be performed at room temperature. An increase or decrease in temperature will cause resistance to change and may result in invalid test results.

2. Test for 10.5 - 11.5 Kohms of resistance between the applicable temperature sensor circuit terminals.

• If not within the specified range, test or replace the applicable temperature sensor.

3. If all circuits test normal, 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.