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TM9-232O-360-20-3
Section 4
TROUBLESHOOTING CHARTS
D. CHART 4 - NO “CHECK ENGINE” LIGHT DURING BULB CHECK OR CANNOT CLEAR CODES
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
RESULT
WHAT TO DO NEXT
C 4-1
Try to Force CEL On
l Plug in DDR.
l Turn ignition on.
l Select ACTIVATE OUTPUTS.
l Activate ‘Check Engine” light.
C 4-2
Check for lgnition
l Read voltage on vehicle harness
connector, socket B3 (red lead)
to a good ground (black lead)
with the ignition on and engine
Off.
C4-3
CEL Drive line and Bulb
Check
l Turn ignition off.
l Remove CEL bulb and check
whether it’s burned out or
otherwise damaged.
DDR display is
blank or random.
Go to C4-2.
“Check Engine”
light is still off.
Go to C4-2.
‘Check Engine”
light is still on.
Go to C4-4.
Less than 10.0 volts.
The DDEC ignition circuit breaker
(CB11) is blown and/or
ignition wires are open or
shorted to ground, and/or the
ignition line (ckt #439) is shorted
to ground or is not wired to
switch ignition source (See note
below). Repair problem. Then
go to C4-30.
Bulb is
okay.
CEL Driver line (ckt #419) or
ground line (ckt #150) is open.
Repair open. Then go to C4-30.
Bulb is
not okay.
Replace bulb (para 7-40). Then
go to C4-30.
NOTE:
Inactive 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 or before ignition.
H-65
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