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Section 4
TM9-2320-360-20-3
TROUBLESHOOTING CHARTS
D. CHART -6 - “CHECK GAUGES” LIGHT ON AND NO ACTIVE CODE ON DDR
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.
This is a Digital output function.
STEP/SEQUENCE
C 6-1
Determine “Check
Gauges” Light Status
l Turn ignition on (engine not
running) while at the same time
observing “Check Gauges” light.
C 6-2
Light Status - DDR
l Plug in DDR.
l Select switch/light status.
l Read CGL.
C 6-3
Check for Short
l Turn ignition off.
l Disconnect the vehicle harness
connector at ECM.
l Turn ignition on (engine not
running) while at same time
observing “Check Gauges” light.
C 6-4
Check ECM
Connectors
l Check terminals at vehicle
harness connector (both ECM
and harness side) for damage
bent, corroded, and unseated
pins or sockets. Pay close
attention to B2 and B3.
RESULT
“Check Gauges”
light comes on for
up to 5 seconds,
then goes out.
“Check Gauges” light
comes on and stays on.
CGL reads on.
Go to C 6 - 4 .
CGL reads off.
Go to C 6-3.
“Check Gauges”-
light comes on
and stays on.
‘Check Gauges”
light stays off.
Terminals
and connectors
are okay.
Problem found.
WHAT TO DO NEXT
This is the normal operation.
Unless other problems exist,
return to service.
Go to C 6-2.
“Check Gauges” light driver line
(ckt #509) is shorted to ground.
Repair short. Then go to C6-30.
Go to C 6-4.
Replace ECM (para 7-29.1).
Then go to C6-30.
Repair terminals/connectors
(pars 7-77). Then go to C6-30.
H-75
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