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Page Title:
CODE 12 VERNIER CONTROL SIGNAL VOLTAGE HIGH. |
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 TM 9-2320-364-20-1
2-13. DDEC II TROUBLESHOOTING (CONT).
A4 CODE 12 VERNIER CONTROL SIGNAL VOLTAGE HIGH.
INITIAL SETUP
Equipment Condition
Tools and Special Tools
Engine OFF, (TM 9-2320-364-10)
Tool Kit, General Mechanic's: Automotive
Parking brake applied, (TM 9-2320-364-10)
(Item 74, Appendix G)
Wheels chocked, (TM 9-2320-364-10)
STE/ICE-R (optional) (Item 3, Appendix G)
Top engine access cover opened,
DDEC Repair Kit (Item 15, Appendix G)
(TM 9-2320-364-10)
Multimeter (Item 44, Appendix G)
Hydraulic selector switch in CRANE/SRW
Reader, Diagnostic (Item 53, Appendix G)
position, (TM 9-2320-364-10)
Jumperwire
CRANE/SRW switch in CRANE position,
(TM 9-2320-364-10)
References
TM 9-2320-364-10
TM 9-4910-571-12&P
START
1.
KNOWN INFO
TEST OPTIONS
DDR test.
CHECK ENGINE light (CEL)
Is Code 12 the only code
comes ON and stays ON.
displayed on DDR?
REASON FOR QUESTION
POSSIBLE PROBLEMS
Isolate fault.
More Codes than Code 12
displayed on DDR.
Wire 952 faulty.
Vernier control connector faulty.
Vernier control faulty.
Wires 1525 and/or 510 shorted.
Wire 952 shorted.
DDL connector and/or vehicle
harness connector MC18
Go to Fault A5A
faulty.
NO
DDEC ECM faulty.
YES
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