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TM9-2320-360-20-3
Section 4
TROUBLESHOOTING CHARTS
D. CHART -4 - NO “CHECK ENGINE” LIGHT DURING BULB CHECK OR CANNOT CLEAR CODES (Cont’d)
STEP/SEQUENCE
RESULT
C4-6
Check for Open
l
Move black lead of voltmeter to
socket D (of the 5-way power
harness connector).
l Read voltage using red lead at
Less than
10.0 volts on
any reading.
sockets A and C of the 5-way
power harness connector.
l Move black lead of voltmeter to
socket E of the 5-way power
harness connector.
l Again read voltage at sockets A,
and C of the 5-way power
harness connector.
l Move black lead to socket B
of 5-way. Check voltage at
A and C.
Greater than
or equal to
10.0 volts on
all readings.
C 4-7
Check ECM
Connectors
l Check terminals at vehicle
harness (especially B3 and B1 )
and all the terminals in the 5-way
power harness connectors (both
the ECM and harness side) for
damage; bent, corroded and
unseated pins or sockets.
C 4-30
Verify Repairs
l Turn ignition off.
l Reconnect all connectors.
l Turn ignition on.
l Clear codes.
l Turn ignition off.
l Turn ignition on while at the same
time observing the “Check
Engine” light.
Terminals
and connectors
are okay.
Problem found.
“Check Engine”
light comes
on for up to
5 seconds,
then goes out.
“Check Engine”
light does
not come on at all.
“Check Engine” light
comes on and stays on.
WHAT TO DO NEXT
Ground line(s) (ckt #150 or 151)
has an open. Repair open.
Then go to C4-30.
Go to C 4-7.
Replace ECM (para 7-29.1).
Then go to C4-30.
Repair terminals/connectors
(para 7-77).Then go to C4-30.
Repairs are complete.
All system diagnostics are
complete. Please review this
section from the first step to
find the error.
Go to START-1, pg H-25.
*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.
H-69
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