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TM9-2320-360-20-3
Section 4
TROUBLESHOOTING CHARTS
E. ENG5V - ENGINE HARNESS +5 VOLTS SUPPLY
NOTE - This chart is only to be used if:
1) All basic mechanical checks and physical inspections have been performed with no problem found, and
2) Diagnosis of DDEC-III was started at step START-1, pg H-25 and you have now been referred here.
STEP/SEQUENCE
ENG5V-1 Check for Low
Battery voltage
l Was there also a Code 168/1?
Yes.
Go to 46-1 (page H-217).
No.
Go to ENG5V-2.
ENG5V-2 Check for + 5 Volts
l Turn ignition off.
l Disconnect the Oil Pressure
Sensor (OPS) and Turbo Boost
Sensor (TBS) connectors.
l Turn ignition on.
At each sensors harness
connector, read voltage between
socket C (red lead) and sockets A
(black lead).
ENG5V-3 Check ECM Connectors
l Check terminals at the engine
harness connector (both the ECM
and harness side) for damaged,
bent, corroded and unseated pins
or sockets.
RESULT
WHAT TO DO NEXT
Between 4.7
Voltage reading is correct. Check
and 5.2 volts.
voltage at next connector. If all
connector voltage readings are
correct, go to ENG5V3.
Less than
4.7 volts at any
or all connectors.
Greater than
5.2 volts
at all connectors.
Go to ENG5V4.
Go to ENG5V-6.
Terminals and
connectors are okay..
Replace ECM (para 7-29.1)
Then go to ENG5V-30.
Repair terminals/connectors
(para 7-77. Then go to
ENG5V-30.
Problems found.
H-241
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