CAUSE A - ENCODER WIRING FAULT
PROCEDURE OR ACTION:
NOTE: Perform Step 1 with key in ON position.
1.

Disconnect the traction motor encoder connector CPS03 and measure voltage between socket 1 and B(-).
Is voltage 5 ± 0.5 Vdc?
YES: Proceed to Step 2.
NO: Inspect circuit 250 for open or short.
2.

Measure resistance between the encoder connector CPS03, socket 4 and B(-).
Is resistance <1 ohm?
YES: Disconnect battery and proceed to Step 3.
NO: Inspect ground circuit 102 for open or short.
3.

Disconnect traction controller connector CPS01 and measure resistance between socket 32 and the encoder connector CPS03, socket 3.
Is resistance <1 ohm?
YES: Proceed to Step 4.
NO: Inspect signal circuit 578 for open or source of excessive resistance.
4.

Measure resistance between socket 31 of the traction controller connector CPS01 and socket 2 of the encoder connector CPS03.
Is resistance <1 ohm?
YES: Proceed to CAUSE C.
NO: Inspect signal circuit 577 for open or source of excessive resistance.
CAUSE B - FAULTY TRACTION ENCODER
PROCEDURE OR ACTION:
1.

Measure voltage between sockets 31/32 and B(-) of the traction connector CPS01; operate traction motor.
Was voltage present?
YES: Proceed to CAUSE D.
NO: Replace encoder. Make sure to indicate the DTC code(s) on the warranty claim to include an accurate problem description leading to controller replacement.
CAUSE C - FAULTY TRACTION MOTOR
PROCEDURE OR ACTION:
NOTE: Disconnect battery.
1.

Measure continuity between the motor terminals U and V.
Is continuity present?
YES: Proceed to Step 2.
NO: Repair or replace faulty motor.
2.

Measure continuity between the motor terminals U and W.
Is continuity present?
YES: Proceed to Step 3.
NO: Repair or replace faulty motor.
3.

Measure continuity between the motor terminals W and V.
Is continuity present?
YES: Proceed to CAUSE D.
NO: Repair or replace faulty motor.
CAUSE D - FAULTY TRACTION CONTROLLER
PROCEDURE OR ACTION:
1.

If no faults are found, replace controller. Make sure to indicate the DTC code(s) on the warranty claim to include an accurate problem description leading to controller replacement.