P0BFD
DTC P0BFD
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
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Drive Motor Phase U-V-W Not Plausible
Circuit/System Description
The generator control module also called the starter generator control module is comprised of the following three control modules; the hybrid powertrain control module, 14 volt power module and the drive motor control module. These three control modules are non serviceable and are part of the generator control module.
The drive motor control module operates the starter generator, also referred to as the drive motor, based upon hybrid powertrain control module commands. The drive motor control module controls the speed and output torque of the starter generator through the sequencing actuation of high current switching transistors called insulated gate bipolar transistors. The starter generator operates utilizing 3-phase alternating current (AC) electricity. Each insulated gate bipolar transistors operates a single phase of the starter generator. Each phase is individually identified as U, V and W. The drive motor control module monitors the current of phase U and W. The drive motor control module uses logic to calculate phase V current values. This information is used in order to detect over current conditions.
Because all starter generator phase circuits are electrically joined together, they should each flow about the same amount of current. The drive motor control module performs a mathematical calculation to verify that the phase current sensors are accurate. If the current sensors indicate about the same amount of phase current, the sum of the calculation should be near zero. If the currents are not similar, this DTC will set.
Conditions for Running the DTC
* The ignition is ON.
* The high voltage contactor relay is closed.
* DTCs P0BE6, POBE7, POBE8, P0BEE, POBEF, or P0BF0 are not set.
Conditions for Setting the DTC
The sum of the 3 phase current calculations is greater than 40 A.
Action Taken When the DTC Sets
* DTC P0BFD is a Type B DTC.
* The generator control module operates in a reduced power mode.
* Regeneration is limited.
* Autostop and electric assist is disabled.
Conditions for Clearing the DTC
DTC P0BFD is a Type B DTC.
Diagnostic Aids
The 14V power module remains active.
Reference Information
Schematic Reference
* Hybrid Controls Schematics Hybrid Controls Schematics
* Hybrid Energy Storage Schematics [1][2]Electrical Diagrams
Description and Operation
* Starter Generator Description and Operation Starter Generator Description and Operation
* Generator Control Module Description and Operation Generator Control Module Description and Operation
* Hybrid Modes of Operation Description Hybrid Modes of Operation 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
Circuit/System Verification
If the DTC is set, clear DTC; Turn the ignition OFF for 2 minutes. Turn the ignition ON, Operate vehicle within conditions for running and setting DTC. If the DTC resets, go to Circuit/System Testing.
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 High Voltage Disabling procedure.
2. Remove the 3-phase cables from the K59 generator control module.
3. Test for infinite resistance between each of the 3-phase circuit terminals listed below and ground:
* X8 phase U terminal
* X7 phase V terminal
* X6 phase W terminal
• If not the specified value, disconnect the 3-phase cables from the A15 starter generator, and test the AC circuits for a short to ground. If the circuit tests normal, replace the A15 starter generator.
• Replace the K59 starter generator control module. If the DTC resets replace the A15 starter generator.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Starter Generator Replacement Starter Generator Replacement
* Drive Motor Generator Battery Cable Replacement Drive Motor Generator Battery Cable Replacement for 3-Phase Cable Assembly replacement
* Control Module References Programming and Relearning for Generator Control Module, also called the Starter Generator Control Module, replacement, programming and setup.