P0ABB

DTC P0ABB

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 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.


Reference Information
Schematic Reference

Hybrid Energy Storage 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 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. Refer to Hybrid Battery Service Disconnect/Connect ().
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. Disconnect harness connector X2 from the SGCM. Refer to Generator Control Module Replacement ().
5. Measure the resistance between X2 terminal 1 and ring terminal 1. Should measure 700-800 ohms.

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

6. If all circuits tests normal, replace BECM.



Repair Instructions

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


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