P0AC1

DTC P0AC1 or P0AC2

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 P0AC1
- Hybrid Battery Current Sensor Circuit Low Voltage

DTC P0AC2
- Hybrid Battery Current Sensor Circuit High Voltage

Circuit/System Description

The battery energy control module (BECM) monitors the current sensor circuit for a low and high voltage condition.

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

P0AC1

Current sensor 1 raw A/D is less than 0.2 volt.

P0AC2

Current sensor 1 raw A/D is less than 4.3 volts.

Action Taken When the DTC Sets

P0AC1, P0AC2

Hybrid system is disabled.

Conditions for Clearing the DTC

P0AC1, P0AC2

Current sensor voltage returns to normal.

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.

P0AC1, P0AC2
1. Disconnect harness connector C1 for the BECM.
2. Disconnect current sensor harness.
3. Test for less than 1 ohm resistance between the following circuits.

* C1 terminal 20 to current sensor connector terminal A
* C1 terminal 9 to current sensor connector terminal B
* C1 terminal 19 to current sensor connector terminal C
* C1 terminal 10 to current sensor connector terminal D

• If not within specified range, replace the current sensor harness assembly.

4. 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