P0AE7

DTC P0AE7

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 Descriptor
DTC P0AE7
- Hybrid Battery Precharge Contactor Control Circuit High Voltage

Diagnostic Fault Information





Circuit/System Description

The drive motor generator battery control module is also referred to as the battery energy control module (BECM). The drive motor generator battery control module will diagnose its own systems and determine when a fault condition is present. Diagnostics and system status is communicated from the drive motor generator battery control module to the hybrid powertrain control module (HPCM) through serial data. The hybrid powertrain control module is the host controller for diagnostic trouble code (DTC) information.

The hybrid drive motor generator battery contains 3 high voltage contactors. The contactors allow the high voltage DC batteries to be connected to the vehicle or safely contain the DC high voltage within the drive motor generator battery assembly. The 3 contactors are a positive high voltage contactor, negative high voltage contactor, and current limit relay. These contactor/relays close and open in sequence and are controlled by the drive motor generator battery control module. The drive motor generator battery control module monitors the control circuit voltage and 12 V reference circuit internal to the control module to determine if the circuit is operating.

Conditions for Running the DTC

* The ignition is ON.
* The 12 V battery voltage is 9-18 V.
* The current limit relay is commanded open.

Conditions for Setting the DTC

This DTC sets when the high voltage current limit relay control circuit voltage and the drive motor generator battery control modules internal voltage reference are within 2 V of each other when the current limit relay is commanded open.

Action Taken When the DTC Sets

* DTC P0AE7 is a type C DTC.
* After 2 failed high-voltage precharge events, a 20-40 minute precharge wait time is activated by the drive motor generator battery control module.

Conditions for Clearing the DTC

DTC P0AE7 is a type C DTC.

Reference Information
Schematic Reference

Hybrid Energy Storage Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Drive Motor Battery System Description (Drive Motor Battery System Description)
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)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information
Special Tools

EL-48900 HEV Safety Kit

Circuit/System Verification

Verify that DTC P0AE7 is not set.

If the DTC is set, refer to High Voltage Contactor/Relay Malfunction (High Voltage Contactor/Relay Malfunction).