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.
ELECTRICAL SYSTEM Diagnostic Trouble Codes
Check the Service Manual section in Yale Axcess Online for possible updates and check pertinent Bulletins
Confidential/Proprietary - Do Not Copy or Duplicate 9030-20-49
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