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TM 9-2320-360-20-3
Section 4
TROUBLESHOOTING CHARTS
C. CEL - FIRST CHART FOR DIAGNOSIS OF DDEC-III WHEN NO DDR IS AVAILABLE (Cont’d)
STEP/SEQUENCE
CEL-4
Verify Code(s)
Turn ignition on.
Obtain a DDR.
Clear codes.
Turn ignition off then back on.
Note status of “Check Engine”
light.
CEL-5
Verify Code(s)
with the Engine
Running
Attempt to start and run the
engine (TM 9-2320-360-10).
Try to get the “Check Engine” light
on by:
- warming up the engine
- slowly changing the engine
from idle to no load speed.
Run engine until the “Check
Engine” light comes on or for
1 minute.
CEL-6
Check for Open
Turn ignition off.
Disconnect the vehicle harness
connector at the ECM.
Install a jumper wire between
sockets C1 and G1 of the vehicle
harness connector.
Also read resistance between pin
E of DDL connector and a
good ground.
RESULT
“Check Engine”
light stays on.
“Check Engine”
light goes on for 5
seconds, then goes out.
“Check Engine” light
is erratic or intermittent.
Engine will
not start.
“Check Engine”
light is off.
“Check Engine”-
light is on.
Less than or
equal to 5 ohms on
either reading.
Greater than
5 ohms or open on
either reading.
WHAT TO DO NEXT
Read codes and follow
appropriate diagnostic chart
(See pg ii).
Go to CEL-5.
Go to CEL-8.
Go to Chart 2, pg H-43.
Previous codes should be
regarded as intermittent.
Go to Chart 1, pg H-40.
Read codes.
Follow appropriate diagnostic
code chart pg ii.
Go to CEL-7.
An open exists either in the
diagnostic request line (ckt
#528) or in the DDR ground line
(ckt #901). Repair open. Then
go to CEL-30.
H-3736
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