ERROR CODES
DTC 64974 – FOC2 Traction Controller Initial Nominal Motor Voltage High
DTC 64798 – FOC2 Traction Controller Operating Nominal Motor Voltage Low
DTC 64799 – FOC2 Traction Controller Operating Nominal Motor Voltage High
DTC 64975 – FOC2 Traction Initial Nominal Motor Voltage Low
POSSIBLE CAUSE
| A. | PHASE CABLE FAULT | |
| B. | TRACTION MOTOR FAULT | |
| C. | CONTROLLER FAULT |
NOTE
Please refer to the end of this procedure for supporting diagrams.
COMPONENT OPERATIONAL CHECK
PROCEDURE OR ACTION:
| 1. | Prior to performing troubleshooting procedures, verify controller is at the latest revision level. See FOC2 Software Updates. |
| 2. | Turn power to OFF for no less than 30 seconds, and then to ON to clear displayed DTC.Does reported DTC reoccur?YES: Proceed to Step 3.NO: Problem not verified, resume operation. |
| 3. | Conduct a quick visual inspection of all connectors/wiring associated with the displayed fault code.Are any faults detected/observed?YES: Repair/replace connector or wiring associated with faults found. Refer to the appropriate Electrical System manual.NO: Proceed to CAUSE A. |
CAUSE A – PHASE CABLE FAULT
PROCEDURE OR ACTION:
| 1. | Disconnect the traction motor cables from the appropriate traction controller and traction motor. Measure continuity of individual cables to isolate fault.Is continuity present?YES: Proceed to CAUSE B.NO: Repair or replace faulty phase cable. |
CAUSE B – TRACTION MOTOR FAULT
PROCEDURE OR ACTION:
| 1. | Measure resistance between the traction motor terminals U and V. Is resistance between .322 and .383 ohms? YES: Proceed to Step 2. NO: Repair or replace faulty traction motor. |
| 2. | Measure resistance between the traction motor terminals U and W. Is resistance between .322 and .383 ohms? YES: Proceed to Step 3. NO: Repair or replace faulty traction motor. |
| 3. | Measure resistance between the traction motor terminals W and V. Is resistance between .322 and .383 ohms? YES: Proceed to CAUSE C. NO: Repair or replace faulty traction motor. |
CAUSE C – CONTROLLER FAULT
PROCEDURE OR ACTION:
| 1. | Replace faulty controller. Make sure to indicate the DTC code(s) on the warranty claim to include an accurate problem description leading to controller replacement. |
