Go to 32-2
page 4-192.
page 3-121.
Section 4
TROUBLESHOOTING
CHARTS
TM9-2320-363-20-1
E. CODE 32-
ECM BACKUP SYSTEM FAILURE
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-II was startedatstepStart-1 (page 3-121 ) and you have now been referred here.
STEP/SEQUENCE
32-1
Ignition Check
l Does
the
engine “Run-on”
momentarily when the ignition is
turned off?
32-2
lsolate Ignition Circuit
#439
l Removeignition Supplied power
to other devices such as
transmitters, radios, or blower
motors.
l Turn ignition on.
l Clear codes (Mode 40-CODES
ERASE).
l Restart engine.
l Turn ignition off.
32-3
Verify Repairs
l Turnignition on.
l Read ACTIVE CODES (Mode 01 ).
RESULT
WHAT TO DO NEXT
YES
Engine DOES
Go to 32-3.
NOT “Run-on”.
Engine “Runs-on”.
Repeat Steps 32-2 to find source
of supplying reverse EMF
(Voltage) to circuit #439.
Code 25 (NO CODES)
Isolate ignition circuit #439 from
or any other
the device supplying reverse
codes except Code 32.
EMF (voltage).
Go to START-1, page 3-121,
to service other codes.
Code 32.
The backup computer inside the
ECM has failed. Replace the
ECM, page 4-129, then go to
START-1, page 3-121.
3-247
