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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
C4-4
Check for Open
l Remove jumper wire. With ignition
on, read voltage on vehicle
harness connector, socket B3
(red lead) to a good ground
(black lead).
C 4-5
Check for Bat t
l Turn ignition off.
l Disconnect the 5-way power
harness connector.
lRead voltage at the 5-way power
harness connector. Socket A (red
lead) to a good ground (black
lead).
l Repeat voltage readings on 5-way
power harness connector, keeping
the black lead to a good ground
and the red lead to socket C.
Less than
10.0 volts.
Greater than
or equal to 10.0 volts.
Less than
10.0 volts on
any reading.
Greater than
or equal to
10.0 volts on
readings.
WHAT TO DO NEXT
The ignition line (ckt #439) is
open. Repair open. Then go
to C4-30.
Go to C 4-5.
Either one of the 20 Amp, DDEC
circuit breakers (CB 20 + 21) is
blown and/or the Battery Power
line(s) (ckt #240 or #241) has
an open or short to ground.
Check that the battery power
(ckt #240 and #241) are
not switched off when the ignition
is turned off (see note below).
Repair problem. Then go
to C4-30.
Go to C 4-6.
*NOTE: Engine update information may not update if main ECM power (ckt #240 and #241) is switched off
with/or before ignition.
H-67
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