Circuit/System Testing
- 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.
- Perform the High Voltage Disabling procedure for servicing at the power inverter control module cable connections.
- Remove the 3-phase cable assembly from the T6 power inverter module distribution box. Refer to Drive Motor Generator Rotor and Stator Removal - Unit A , and Drive Motor Generator Rotor, Stator, and Output Sun Gear Shaft Removal - Unit B .
- Test for infinite resistance between each of the AC circuit terminals listed below and ground:
- X5 drive motor 1 phase U terminal
- X5 drive motor 1 phase V terminal
- X5 drive motor 1 phase W terminal
- X6 drive motor 2 phase U terminal
- X6 drive motor 2 phase V terminal
- X6 drive motor 2 phase W terminal
- If not the specified value and the engine was running then stalled when the DTC set, test the AC circuit for a short to ground or a short between the AC circuit terminals and the aluminum cable mounting block. If the circuit tests normal, replace the appropriate M15 drive motor. If the DTC resets replace the T6 power inverter module.
- If not the specified value, and the engine would not crank when the DTC set, test the AC circuit for a short to ground or a short between the AC circuit terminals and the aluminum cable mounting block. If the circuit tests normal, replace the T6 power inverter module. If the DTC resets replace the M15 drive motor.
WARNING:
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:
Failure to follow the procedures exactly as written may result in serious injury or death.