DTC 30068
MainCont (Stuck Open)
POSSIBLE CAUSE
A. MAIN CONTACTOR COIL WIRING FAULT
B. FAULTY B(+) CONNECTION
C. MAIN CONTACTOR STUCK OPEN
D. FAULTY TRACTION CONTROLLER
NOTE
Please refer to the end of this procedure for supporting diagrams.
COMPONENT OPERATIONAL CHECK
PROCEDURE OR ACTION:
1. Conduct a visual inspection of all connectors/wiring associated with the fault code.
Are any faults detected/observed?
YES: Repair/replace connector or wiring associated with faults found. Refer to the appropriate Electrical
SystemYRM.
NO: Proceed to Step 2.
2. Re-key the vehicle.
Is the code still present?
YES: Proceed to CAUSE A.
NO: Problem may be intermittent.
CAUSE A - MAIN CONTACTOR COIL WIRING FAULT
PROCEDURE OR ACTION:
NOTE: Key in ON position.
1. Disconnect the main contactor coil's positive socket terminal TS07 and measure voltage between the terminal
and B(-).
Is voltage 24 ± 2.5 Vdc?
YES: Disconnect battery and proceed to Step 2.
NO: Inspect circuit 239 for open or short.
2. Disconnect the traction controller connector CPS01 and the contactor coil negative terminal TS08. Measure
continuity between TS08 and socket 6 of the traction controller CPS01.
Is continuity present?
YES: Reconnect battery and all connectors. Proceed to CAUSE B.
NO: Inspect ground control circuit 075 for open or short.
CAUSE B - FAULTY B(+) CONNECTION
PROCEDURE OR ACTION:
1. Review basic electrical troubleshooting information and perform steps in the Voltage Checks. Rekey the truck
and check for codes.
Is code still present?
YES: Proceed to CAUSE C.
NO: Ensure all terminal lugs are appropriately torqued.
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 9030-20-25
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