P0C08

DTC P0C08

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P0C08
- Drive Motor 2 Phase U-V-W Circuit

Circuit/System Description

Each drive motor generator is controlled by a motor control module (MCM). The drive motor generators utilize 3 phase alternating current (ac) electricity. The drive motor generator stator coil is comprised of three phase circuits. The phase circuits are identified as phase U, phase V and phase W. The U-V-W phase circuits are connected in a Y configuration. This means each phase is connected at a single, central point. The MCM monitors a current sensor connected to each drive motor generator phase.

Conditions for Running the DTC

Ignition voltage is 8-18 volts.

Conditions for Setting the DTC

The MCM detects at least one U-V-W phase current sensor is less than 9 amps.

Action Taken When the DTC Sets

* DTC P0C08 is a Type A DTC.
* The hybrid powertrain control module (HPCM) commands the battery energy control module (BECM) to open the high voltage contactor relays.

Conditions for Clearing the DTC

DTC P0C08 is a Type A DTC.

Circuit/System Verification

1. Clear the DTC information.
2. Turn the ignition OFF for 1 minute.
3. Attempt to drive the vehicle.
4. Retest for DTC P0C08.

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.

Disable the high voltage for servicing at the Drive Motor Generator Control Module Assembly cable connections. Refer to High Voltage Disabling.

1. Inspect for damaged 3 phase cables between the drive motor generator power inverter control module (PIM) and the transmission.

^ If damage is observed, replace the 3 phase cables.

2. Remove the 3 phase cable assembly from the PIM distribution box.
3. Test the resistance of each phase by measuring between the following circuits with a DMM. You should measure 0.5 ohms or less.

* Phase U and phase V
* Phase U and phase W

^ If less than the specified value replace the PIM.
^ If more than the specified value continue with diagnosis.

4. Disconnect the 3 phase cable assembly from the transmission.
5. Test each cable for continuity from the PIM connection terminal to the transmission connection terminal. You should measure 0.5 ohms or less.

^ If more than the specified value replace the 3 phase cable assembly.
^ If less than the specified value replace the drive motor generator assembly.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* 3 phase cable assembly. Refer to Drive Motor Generator Power Inverter Module Cable Removal.
* Drive motor generator 2. Refer to Drive Motor with Generator Assembly Removal - 2nd Position.