Ignition Switch-ST and Inhibitor Switch (A/T)

Inhibitor Switch (A/T) Circuit:

To test the inhibitor switch, proceed as follows.

COMPONENT TEST
1. Disconnect the inhibitor switch connector.
2. Using an ohm meter, check for continuity between inhibitor switch terminals 8 and 9.

Continuity
Exists W/transmission in park.
Continuity
Exists W/transmission in neutral.
Continuity
Does not exist W/transmission in any other position.


HARNESS TEST:
1. With the transmission shift indicator in park or neutral, disconnect the ECU connector and the inhibitor switch connector.
2. Turn the key to the START position.
3. Using a voltmeter, check the voltage between inhibitor switch harness terminal 8 and ground.

Voltage:
System Voltage.

4. Reconnect the ECU harness connector and turn the key to the ON position
5. Using a voltmeter, check the voltage between the inhibitor harness connector terminal 8 and ground

Voltage:
No Voltage.

6. Place the transmission in PARK, reconnect the inhibitor switch connector and disconnect the ECU connector.
7. Turn the key to the START position and check the voltage between ECU harness connector terminal 108 and ground.

Voltage:
8 or more volts.


If any of the previous tests produce unsatisfactory results, the harness will need to be repaired or replaced. Once repairs have been completed, road test the vehicle to confirm that the repair has corrected the problem.

If the same problem reoccurs, it is possible that there is an intermittent failure of the component or the ECU. Check for looseness at all harness junctions and test for an intermittent failure.