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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).
4.
KNOWN INFO
TEST OPTIONS
CHECK ENGINE light (CEL)
Visual inspection.
Are vernier control
comes ON and stays ON.
Code 12 only displayed on
connectors and/or
REASON FOR QUESTION
DDR.
terminals OK?
Wire 952 OK.
Damaged connectors can affect
signal to vernier control.
POSSIBLE PROBLEMS
Vernier control connector faulty.
Vernier control faulty.
Wires 1525 and/or 510 shorted.
Wire 952 shorted.
DDL connector and/or vehicle
harness connector MC18
faulty.
Repair vernier control
DDEC ECM faulty.
connectors
(Para 7-101).
NO
Verify repair, go to
Step 8 of this Fault.
YES
Replace vernier
control (Para 7-100).
Verify repair, go to
Step 8 of this Fault.
5.
KNOWN INFO
TEST OPTIONS
WARNING
READ WARNING
CHECK ENGINE light (CEL)
Voltage test.
on Page 2-197
comes ON and stays ON.
STE/ICE-R #89.
Code 12 only displayed on
DDR.
REASON FOR QUESTION
Is there less than 1.0 vdc
Wire 952 OK.
between vernier control
Vernier control connector OK.
Greater than 1.0 vdc at harness
Vernier control OK.
connector indicates signal line
harness connector MC38,
wires 1525 or 510 are shorted to
terminals B and A?
vehicle wire 916 (+5 volt line) or
POSSIBLE PROBLEMS
another voltage source.
Wire 952 shorted.
Wires 1525 and/or 510 shorted.
Repair wires 1525
DDL connector and/or vehicle
and/or 510 (see
harness connector MC18
schematic Fig 2-1)
faulty.
or notify DS
NO
DDEC ECM faulty.
Maintenance.
Verify repair, go to
Step of 8 of this Fault.
YES
2-196
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