STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
TM 9-2320-363-20-1
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 3-345.41 and you have now been referred here.
C 7-1
Read Codes on the
"Check Engine"Light
Unplug DDR.
Flashes
Go to C 7-4 (note: if you wish to
Ignition on. Engine not running.
out codes.
bypass diagnosis of a potential
Enable diagnostic request
data line of DDR problem for
switch.
now, go to CEL-3).
Read codes flashing out on
"Check Engine" light.
Does not flash
Go to C7-2.
out codes.
C 7-2
Check Diagnostic
Request Circuit
Ignition on.
Switch reads off.
The Diagnostic Request circuit
Plug in DDR.
(#528) is open or ground is poor
Select Calibration Configuration.
or open. Repair open wire or
(ECM input switches)
bad ground. Then go to C7-30.
determine port assigned to
"Diagnostic Request" (i e. G1
- #528)
Go to switch light status.
Switch reads on.
Go to C7-3.
Depress and hold Diagnostic
Request switch.
Read status of Diagnostic
Request.
C 7-3
Check ECM
Connectors
Check terminals at vehicle
Terminals
Replace ECM, then go to C7-30.
harness and 5-way power
and connectors
harness connectors (both ECM
are okay.
and harness side) for damage;
bent, corroded and unseated pins
Problem found.
Repair terminals/connectors.
or sockets.
Then go to C7-30.
Change 3 3-345.99
