STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
TM 9-2320-363-20-1
Section 4
TROUBLESHOOTING CHARTS
D. CHART 26 · DEACCELERATION LIGHT INOPERATIVE
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 26-1
Check Configuration
Turn ignition on.
Plug in DDR.
Not configured
Review ECM in/outs
for Decel Light.
Reconfigure ECM to enable
configuration.
this output.
Determine cavity/wire assigned
"Decel Light" (output).
Data obtained.
Go to C 26-2.
C 26-2
Force Light On
Using DDR, select activate
Light goes "on".
Go to C 26-3.
outputs.
Ensure TPS is at 0%.
Light stays "off'.
Wire from ECM to light is open,
Activate Decel Light.
or bulb is bad, or open exists in
+ side of bulb. Repair/replace.
Then go to C 26-30.
C 26-3
Check ECM
Connectors
Turn ignition off.
Terminals and
Reprogram ECM. Then go to
Check terminal at the vehicle
connectors - ok.
C 26-30.
harness connector (or the
connector with this wire number)
Problem found.
Repair terminals/connectors.
both ECM and harness side.
Then go to C26-30.
Change 3 3-345.177
