P0ABB

DTC P0ABB

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 P0ABB
- Hybrid Battery Voltage Sensor Performance

Circuit/System Description

The engine control module (ECM) performs a rationality check for the voltage sensor located in the battery energy control module (BECM).

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

* Battery Pack Voltage - Pack Rationality Mean Voltage is greater than 5 volts.
* Pack Rationality Mean Voltage = Power Electronics Voltage + ModVolt 1 + ModVolt 2 + ModVolt 3/2.

Action Taken When the DTC Sets

Hybrid system is inactive.

Conditions for Clearing the DTC

Pack voltage returns to normal.

Diagnostic Aids

Possible 36 volt open circuit between starter/generator control module (SGCM) and BECM.

Circuit/System Testing

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.

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. Remove the generator battery disconnect control module cover.
2. Measure and record the voltage at ring terminal 3 to ground.
3. Depress and hold the service disconnect switch and measure the voltage at ring terminal 1 to ground. The voltage should read the same as in step 2.

• If no voltage was measured at ring terminal 1 with service disconnect switch depressed, replace BECM.

4. Measure the resistance between C2 terminal 1 and ring terminal 1. Should measure 700 - 800 ohms.

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

5. If all circuits tests normal, replace BECM.

Repair Instructions

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

Control Module References for BECM replacement, setup, and programming