AUTOMATIC TRANSMISSION ± Troubleshooting <A/T>AUTOMATIC TRANSMISSION ± Troubleshooting <A/T>
23-25
INSPECTION PROCEDURE 14
Inhibitor switch system
Probable cause
If the engine does not start in P or N range, the cause is probably a problem in
the inhibitor switch system.
D Malfunction of inhibitor switch
D Malfunction of harness or connector
D Malfunction of A/T-ECU
MUT-II SERVICE DATA
D 37 ± Inhibitor switch
OK: MUT-II display and selector
lever position should match
OK
Completed
NG
Check the inhibitor switch. (Refer to
P.23-37.)
NG
Replace
OK
Measure at inhibitor switch connector
B-04.
D Disconnect the connector and
measure at the harness side.
D Voltage between terminal 1 and
earth (Ignition switch: ON)
OK: System voltage
NG
Check the ignition switch. (Refer to
GROUP 54 ± Ignition Switch.)
OK
Check the following connectors:
B-04, D-04
NG
Repair
OK
Check the trouble symptoms. Check the harness wire between the
inhibitor switch and the A/T-ECU.
NG
Repair
OK
Replace the A/T-ECU.
NG
INSPECTION PROCEDURE 15
Overdrive switch system
Probable cause
If downshifting does not occur when overdrive switch is turned off while driving
in 4th gear, or if shifting to 4th gear is not possible, the cause is probably a problem
in the overdrive switch system.
D Malfunction of overdrive switch
D Malfunction of harness or connector
D Malfunction of A/T-ECU
D Malfunction of ignition switch
MUT-II SERVICE DATA
D 35 ± Overdrive switch
OK: MUT-II display and overdrive
switch OD/OD-OFF position
should match.
OK
Completed
NG
Check the overdrive switch. (Refer to
P.23-51.)
NG
Replace
OK
Measure at overdrive switch connector
D-35.
D Disconnect the connector and
measure at the harness side
D Voltage between terminal 3 and
earth (Ignition switch: ON)
OK: System voltage
OK
Check the following connectors:
D-35, D-34, D-04
NG
Repair
OK
Check the trouble symptoms.
NG
Check the harness wire between the
overdrive switch and the A/T-ECU.
OK
Repair
NG
Check the ignition switch. (Refer to
GROUP 54 ± Ignition Switch.)
Replace the A/T-ECU.
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