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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- 4
-
Check for Open
Remove jumper wire. With ignition
Less than
The ignition line (ckt #439) is
on, read voltage on vehicle
10.0 volts.
open. Repair open. Then go
harness connector, socket B3
to C 4-30.
(red lead) to a good ground
(black lead).
Greater than
Go to C 4--5.
or equal to 10.0 volts.
C 4- 5
-
Check for Bat +
Turn ignition off.
Less than
Either one of the 20 Amp, DDEC
Disconnect the 5-way
10.0 volts on
circuit breakers (CB22 or CB23)
power harness connector.
any reading.
is blown and/or the Battery
Read voltage at the 5-way power
Power line(s) (ckt #240 or #241)
harness connector. Socket A (red
has an open or short to
lead) to a good ground (black
ground. Check that the battery
lead).
power (ckt #240 and #241)
Repeat voltage readings on 5-way
are not switched off when
power harness connector, keeping
the ignition is turned off (see
the black lead to a good ground
note below). Repair problem.
and the red lead to socket C.
Then go to C 4-30.
Greater than
Go to C 4--6.
or equal to
10.0 volts on
readings.
*NOTE: Engine update information may not update if main ECM power (ckt #240 and #241) is switched off
with/or before ignition.
2-581

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