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TM9-2320-360-20-3
Section 4
TROUBLESHOOTING CHARTS
D. CHART -7 - NO DATA TO 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.
STEP/SEQUENCE
C 7-1
Reed Codes on the
“Check Engine” Light
l Unplug DDR.
l Ignition on. Engine not running.
l Depress and hold
diagnostic request switch.
l Read codes flashing out on
“Check Engine” light.
C 7-2
Check Diagnostic
Request Circuit
l Ignition on.
l Plug in DDR.
l Select VIEW CALIBRATION.
l Select ECM INS/OUTS to
determine port assigned to
“Diagnostic Request (i.e., G1
- #528)
l Go to SWITCH LIGHT STATS.
l Depress and hold diagnostic
request switch.
l Read status of diagnostic
request.
C 7-3
Check ECM
Connectors
l Check terminals at vehicle
harness and 5-way power
harness connectors (both ECM
and harness side) for damage;
bent, corroded, and unseated pins
or sockets.
RESULT
WHAT TO DO NEXT
Flashes
out codes.
Go to C 7-4 (NOTE: if you wish to
bypass diagnosis of a potential
data line of DDR problem for
now, go to CEL-3, page H-35).
Does not flash
Go to C 7-2.
out codes.
Switch reads off.
The diagnostic request circuit
(#528) is open or ground is poor
or open. Repair open wire or
bad ground. Then go to C7-30.
Switch reads on.
Go to C 7-3.
Terminals
and connectors
are okay.
Replace ECM (para 7-29.1).
Then go to C7-30.
Problem found.
Repair terminals/connectors
(para 7-77). Then go to C7-30.
H-79
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