STEP/SEQUENCE
RESULT
WHAT TO DO NEXT
TM 9-2320-363-20-1
Section 4
TROUBLESHOOTING CHARTS
D. CHART 15 · IDLE SHUTDOWN FEATURE ALWAYS ON (Cont'd)
C 15-4
Check if Engine Still
Shuts Down
Place transmission in neutral.
Park brake/ISD switch
A short exists in the switch input
Start engine and drive vehicle until
reads "on"
being used. Either the switch is
one of three things occur:
shorted, or the wire is shorted
1) DDR reads "on"
to ground. Repair short. Then
2) engine shuts down or
go to C 15-30.
3) vehicle has been driven
for a period exceeding the
Engine shuts
If the DDR display never read
idle shutdown time.
down.
"on" the fault is not in the idle
shutdown circuit. If no code(s)
are logged, follow appropriate
diagnostic charts. (See Index).
Vehicle driven
Idle shutdown problem is not
in excess of idle
present at the moment, but may
shutdown time.
be intermittent. Refer to C 1-2,
pg 3-345.61, for help on
intermittent diagnosis.
C 15-30
Verify Repairs
Turn ignition off.
Vehicle driven
Repairs are complete.
Reconnect all connectors.
in excess of idle
Turn ignition on.
shutdown time
Clear codes.
without shutdown.
Start engine and drive vehicle for
longer than programmed for ISD
Engine shuts
All system diagnostics are
or engine shuts down.
down.
complete. Please review this
section from the first step to find
the error.
Change 3 3-345.153
