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Page Title:
CODE 12 VERNIER CONTROL SIGNAL VOLTAGE HIGH (CONT). |
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 TM 9-2320-364-20-1
A4 CODE 12 VERNIER CONTROL SIGNAL VOLTAGE HIGH (CONT).
6.
KNOWN INFO
TEST OPTIONS
WARNING
READ WARNING
CHECK ENGINE light (CEL)
Voltage test.
on Page 2-199
comes ON and stays ON.
STE/ICE-R #89.
Code 12 only displayed on
DDR.
REASON FOR QUESTION
Wire 952 OK.
Are there less than 4.5 vdc at
Vernier control connector OK.
Greater than 4.5 vdc indicates
vernier control harness
Vernier control OK.
open in wire 952 between
connector MC38, terminals C
Wires 1525 and 510 not
vernier control and DDEC
shorted.
and A?
ECM.
POSSIBLE PROBLEMS
Wire 952 shorted.
Repair wire 952 (see
DDL connector and/or vehicle
schematic Fig 2-1) or
harness connector MC18
notify DS
NO
faulty.
Maintenance.
DDEC ECM faulty.
Verify repair, go to
Step 8 of this Fault
YES
7.
KNOWN INFO
TEST OPTIONS
WARNING
READ WARNING
CHECK ENGINE light (CEL)
Visual inspection.
on Page 2-199
comes ON and stays ON.
Code 12 only displayed on
REASON FOR QUESTION
DDR.
Are DDEC ECM connector
Wire 952 OK.
Vernier control connector OK.
Damaged connectors will cause
and vehicle harness MC18
Vernier control OK.
a code 12 to be displayed.
free of damage?
Wires 1525 and/or 510 not
shorted.
Wire 952 not shorted.
POSSIBLE PROBLEMS
Repair vehicle
DDL connector and/or vehicle
harness connector
harness connector MC18
MC18 (Para 7-101) or
faulty.
replace DDEC ECM
NO
DDEC ECM faulty.
(Para 7-56).
Verify repair, go to
Step 8 of this fault.
YES
Replace DDEC ECM
(Para 7-56).
Verify repair, go to
Step 8 of this Fault.
2-198
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