P0BFE
DTC P0BFD or P0BFE
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 P0BFD
- Drive Motor 1 Phase U-V-W Correlation
DTC P0BFE
- Drive Motor 2 Phase U-V-W Correlation
Circuit/System Description
The drive motor generator power inverter control module (PIM) contains two motor control modules (MCMs) and the hybrid powertrain control module (HPCM). Each MCM operates its respective drive motor generator based upon HPCM commands. Each MCM controls the speed, direction and output torque of its respective drive motor generator through the sequencing actuation of high current switching transistors called insulated gate bipolar transistors (IGBTs). Each drive motor generator operates utilizing 3-phase alternating current (ac) electricity. Each IGBT operates a single phase of the drive motor generator. Each phase is individually identified as U, V and W. Each MCM monitors the current of each phase in order to detect PIM overcurrent conditions.
Because all the motor generator phase circuits are electrically joined together, they should each flow about the same amount of current. The MCM performs a mathematical calculation to verify that the phase current sensors are accurate. If the U-V-W phase current sensors indicate about the same amount of phase current, the sum of the calculation should be near zero. If the U-V-W phase currents are not similar, this DTC will set.
Conditions for Running the DTC
* The ignition is ON.
* The High Voltage contactor relays are closed.
Conditions for Setting the DTC
The sum of the 3 phase current sensors is greater than 75 A.
Action Taken When the DTC Sets
* DTCs P0BFD and P0BFE are Type A DTCs.
* The PIM commands the battery energy control module (BECM) to open the high voltage contactor relays.
Conditions for Clearing the DTC
DTCs P0BFD and P0BFE are Type A DTCs.
Reference Information
Schematic Reference
Hybrid Controls Schematics ()
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)
Circuit/System Verification
1. Clear the DTC information.
2. Turn the ignition OFF for 2 minutes.
3. Turn the ignition ON.
4. Operate the vehicle within the conditions for running and setting.
5. Retest for the DTC.
Circuit/System Testing
Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.
The High Voltage Disabling procedure will perform the following tasks:
* Identify how to disable high voltage.
* Identify how to test for the presence of high voltage.
* Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.
Failure to follow the procedures exactly as written may result in serious injury or death.
1. Perform the High Voltage Disabling () procedure for servicing at the drive motor generator control module cable connections.
2. Remove the 3-phase cable assembly from the PIM distribution box. Refer to Generator Control Module 3-Phase Cable Assembly Replacement ().
3. Test the resistance to ground for each phase of the applicable drive motor generator by measuring between the following points with a DMM.
* Phase U terminal and chassis ground
* Phase V terminal and chassis ground
* Phase W terminal and chassis ground
• If less than infinite is measured, continue with Circuit/System Testing.
• If infinite resistance is measured, and prior to disabling the system the vehicle made no attempt to crank the engine, replace the PIM and retest for DTCs. If P0BFD or P0BFE still resets, replace the drive motor generator assembly that corresponds to the set DTC.
• If infinite resistance is measured, and prior to disabling the system the engine initially starts but later stalls, replace the drive motor generator assembly that corresponds to the set DTC and retest for DTCs. If P0BFD or P0BFE still resets, replace the PIM.
4. Remove the 3-phase cable assembly from the transmission. Refer to Generator Control Module 3-Phase Cable Assembly Replacement (). Ensure the terminals are not contacting chassis ground.
5. Retest the resistance to ground for each phase of the 3-phase cable. Measure between the following points with a DMM.
* Phase U terminal and the shield ground
* Phase V terminal and the shield ground
* Phase W terminal and the shield ground
• If infinite resistance is measured, replace the applicable drive motor generator.
• If less than infinite is measured, replace the generator control module 3-phase cable assembly.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Control Module References (Programming and Relearning) for PIM replacement, setup, and programming.
* Generator Control Module 3-Phase Cable Assembly Replacement ()
* Drive Motor with Generator Assembly Removal - 1st Position (8. Drive Motor with Generator Assembly Removal - 1st Position)
* Drive Motor with Generator Assembly Removal - 2nd Position (13. Drive Motor with Generator Assembly Removal - 2nd Position)