GDI ± Troubleshooting
13A-64
INSPECTION PROCEDURE 26
Ignition switch-ST and inhibitor switch system <A/T>
Probable cause
The ignition switch-ST outputs a HIGH signal to the engine-ECU while the
engine is cranking, and the engine-ECU uses this signal to carry out functions
such as fuel injection control during starting.
The inhibitor switch inputs the position of the selector lever to the engine-ECU.
The engine-ECU uses this signal to carry out idle speed control.
D Malfunction of the ignition switch
D Malfunction of the inhibitor switch
D Open circuit or short-circuited harness wire
between ignition switch and inhibitor switch
D Malfunction of the engine-ECU
OK
Check the trouble symptoms.
(2) NG
NG
Repair
OK
Check the trouble symptoms.
NG
Check the harness wire between the
inhibitor switch connector and the start-
er S terminal, and repair if necessary.
(3) NG
NG
Repair
OK
Check the ignition switch. (Refer to
GROUP 54.)
NG
Repair
NG
Repair
OK
Replace the engine-ECU.
NG
Check the harness wire between the
engine-ECU and the inhibitor switch.
OK
Check the trouble symptoms.
NG
Check the harness wire between the
inhibitor switch and the ignition switch
connector.
NG
Repair
OK
Check the trouble symptoms.
Check the following connector:
C-39, D-02
OK
Check the following connector:
B-04
Check the following connectors:
A-83, B-01
OK
Measure at the inhibitor switch connec-
tor B-04.
D Disconnect the connector, and
measure at the harness side.
(1) Voltage between 4 and earth
(Ignition switch: ON)
OK: System voltage
(2) Continuity between 1 and earth
OK: Continuity
(3) Voltage between 4 and earth
(Ignition switch: START)
Disconnect the engine-ECU
connector.
OK: System voltage
(1) NG
Check the following connectors:
C-18, C-24, D-02
NG
Repair
Check the inhibitor switch (Refer to
GROUP 23 ± On-vehicle Service.)
NG
Replace
Check the harness wire between
the engine-ECU and the inhibitor
switch connector.
NG
OK NG
Replace the engine-ECU.
Repair
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