P1EF8

DTC P1EF8

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors
DTC P1EF8 00
- Battery Charger Control Module High Voltage Energy Communication Bus Enable Circuit Low Voltage

Diagnostic Fault Information






Circuit/System Description

The battery charger compares the high voltage energy management communication enable hardwire signal with a hybrid powertrain control module 2 serial data message indicating that the high voltage energy management communication enable signal is active. If the high voltage energy management communication enable hardwire signal is low when the serial data message indicates it should be high, then DTC P1EF8 is set.

Conditions for Running the DTC

The control module is awake and communicating.

Conditions for Setting the DTC

A short to ground or an open circuit may exist on the high voltage energy communication enable circuit.

Action Taken When the DTC Sets

DTC P1EF8 is a type A DTCs.

Conditions for Clearing the DTC

DTC P1EF8 is a type A DTCs.

Diagnostic Aids

Short to ground will also set multiple no communication codes for control modules on high voltage energy serial data bus.

Reference Information
Schematic Reference

* Data Communication Schematics [1][2]Electrical Diagrams
* Control Module References Programming and Relearning

Connector End View Reference

Component Connector End Views Hybrid/EV Battery Pack X1
Description and Operation

Data Link Communications Description and Operation Description and Operation
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Programming and Relearning for scan tool information

Circuit/System Testing

Note: Use the schematic to identify the control modules B+, ignition, ground, communication enable and serial data circuit terminals.

1. Vehicle OFF, disconnect the X1 harness connector at the T18 battery charger.
2. Vehicle in Service Mode, verify that a test lamp illuminates between the high voltage energy management communication enable circuit terminal G X1 and ground.

• If the test lamp does not illuminate, test the circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the K114B hybrid powertrain control module 2.

3. Vehicle OFF, verify that a test lamp does not illuminate between the high voltage energy management communication enable circuit terminal G X1 and ground.

• If the test lamp illuminates, test the circuit for a short to voltage. If the circuit tests normal, replace the K114B hybrid powertrain control module 2.

4. If all circuits test normal, replace the T18 battery charger.

Repair Instructions

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

Control Module References Programming and Relearning for control module replacement, programming and setup