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Page Title: CHART - 4 - NO "CHECK ENGINE" LIGHT DURING BULB CHECK OR CANNOT CLEAR CODES (Cont'd)
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TM 9-2320-364-20-1
Section IV. TROUBLESHOOTING CHARTS (Cont.)
D. CHART - 4 - NO "CHECK ENGINE" LIGHT DURING BULB CHECK OR CANNOT CLEAR CODES (Cont'd)
-
STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
C 4- 6
-
Check for Open
Move black lead of voltmeter to
Less than
Ground line(s) (ckt #150 or 151)
socket D (of the 5-way power
10.0 volts on
has an open. Repair open.
harness connector).
any reading.
Then go to C 4-30.
Read voltage using red lead at
sockets A and C of the 5-way
power harness connector.
Greater than
Go to C 4--7.
Move black lead of voltmeter to
or equal to
socket E of the 5-way power
10.0 volts on
harness connector.
all readings.
Again read voltage at sockets A,
and C of the 5-way power
harness connector.
Move black lead to socket B
of 5-way. Check voltage at
A and C.
C 4- 7
-
Check ECM
Connectors
Check terminals at vehicle
Terminals
Replace ECM (para 7-57).
harness (especially B3 and B1)
and connectors
Then go to C 4-30.
and all the terminals in the 5-way
are okay.
power harness connectors (both
the ECM and harness side) for
Problem found.
Repair terminals/connectors
damage; bent, corroded and
(para 7-101).Then go to C 4-30.
unseated pins or sockets.
C 4-30
Verify Repairs
Turn ignition off.
"Check Engine"
Repairs are complete.
Reconnect all connectors.
light comes
Turn ignition on.
on for up to
Clear codes.
5 seconds,
Turn ignition off.
then goes out.
Turn ignition on while at the same
time observing the "Check
"Check Engine"
All system diagnostics are
Engine" light.
light does
complete. Please review this
not come on at all.
section from the first step to
find the error.
"Check Engine" light
Go to START-1, pg 2-539.
comes on and stays on.
*NOTE: Historical codes will not clear and engine hours/fuel consumption values will not update if main ECM power
(ckt #240 and #241) is switched off with ignition.
2-583

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