P0ADC

DTC P0ADB or P0ADC

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 P0ADB
- Hybrid Battery Positive Contactor Control Circuit Low Voltage

DTC P0ADC
- Hybrid Battery Positive 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

P0ADB
* The ignition is ON.
* The jump assist function is not active.
* The 12 V battery voltage is 9-18 V.
* High voltage contactors are commanded closed.

P0ADC
* The 12 V battery voltage is 9-18 V.
* High voltage contactors are commanded open.

Conditions for Setting the DTC

P0ADB

The drive motor generator battery control module compares the contactor control circuit to the drive motor generator battery control modules internal 12 V measurement reference circuit. This DTC sets when the contactor control circuit voltage is 2 V less than the drive motor generator battery control module internal voltage reference when the high voltage positive contactor is commanded closed.

P0ADC

The drive motor generator battery control module compares the contactor control circuit to the drive motor generator battery control modules internal 12 V measurement reference circuit. This DTC sets when the contactor control circuit voltage and the drive motor generator battery control modules internal voltage reference are within 2 V of each other when the high voltage positive contactor is commanded open.

Action Taken When the DTC Sets

DTCs P0ADB and P0ADC are type C DTCs.

Conditions for Clearing the DTC

DTCs P0ADB and P0ADC are type C DTCs.

Reference Information
Schematic Reference

Hybrid Energy Storage Schematics [1][2]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

DTC Type Reference

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

Control Module References Control Module References for scan tool information
Special Tools

EL-48900 HEV Safety Kit

Circuit/System Verification

Testing Verify that DTC P0ADB or P0ADC is not set.

If any of the DTCs are set, refer to High Voltage Contactor/Relay Malfunction High Voltage Contactor/Relay Malfunction.