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Page Title:
ENGINE HARNESS +5 VOLT SUPPLY (CONT). |
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 TM 9-2320-364-20-1
A5B ENGINE HARNESS +5 VOLT SUPPLY (CONT).
4.
KNOWN INFO
TEST OPTIONS
WARNING
Read WARNING
CHECK ENGINE light (CEL)
Visual inspection.
on Page 2-407
comes ON and stay ON.
ECM supply voltage OK.
REASON FOR QUESTION
4.7 to 5.2 vdc supplied to FTS
Are ECM and engine harness
or TBS.
Damage to connectors can
4.7 to 5.2 vdc supplied to OPS
connectors OK?
affect signal to DDEC ECM.
or OTS.
POSSIBLE PROBLEMS
Damaged ECM and engine
harness connector.
Open in engine +5 volt line.
Repair engine
Short in engine +5 volt line.
harness connector
Short to battery positive.
(Para 7-101) or re-
NO
place DDEC ECM
(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.
5.
KNOWN INFO
TEST OPTIONS
CAUTION
Read CAUTION
CHECK ENGINE light (CEL)
Resistance test.
on Page 2-407
comes ON and stay ON.
STE/ICE-R #91.
ECM supply voltage OK.
4.7 to 5.2 vdc supplied to FTS
REASON FOR QUESTION
Are there 5 ohms or less mea-
or TBS.
4.7 to 5.2 vdc supplied to OPS
sured between wires 416 and
Resistance more than 5 ohms
or OTS.
indicates open in wire 416 or
452 at engine harness con-
ECM and engine harness
sensor return wire 452.
nector, terminals W1 and Y2?
connectors OK.
POSSIBLE PROBLEMS
Repair wires 416
Open in engine +5 volt line.
and/or 452
Short in engine +5 volt line.
(see schematic
Short to battery positive.
NO
Fig 2-2) or notify
DS Maintenance.
Verify repair, go to
Step 8 of this Fault.
YES
2-406
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