Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC P0ADF
- Hybrid Battery Negative Contactor Control Circuit Low Voltage
DTC P0AE0
- Hybrid Battery Negative 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
P0ADF
* The ignition is ON.
* The jump assist function is not active.
* The 12 V battery voltage is 9-18 V.
* The negative contactor is commanded closed.
P0AE0
* The 12 V battery voltage is 9-18 V.
* The negative contactor is commanded open.
Conditions for Setting the DTC
P0ADF
The control circuit voltage is 2 V less than B+ when the negative contactor relay is commanded closed.
P0AE0
The control circuit voltage is within 2 V of B+ when the negative contactor relay is commanded open.
Action Taken When the DTC Sets
DTCs P0ADF and P0AE0 are type C DTCs.
Conditions for Clearing the DTC
DTCs P0ADF and P0AE0 are type C DTCs.
