Throttle Full Close Switch: Testing and Inspection

Idle Position Switch Circuit:

To test the Idle Switch, incorporated into the throttle position sensor, proceed as follows.

Idle Position Switch Test:

COMPONENT TEST
1. Disconnect the idle switch / throttle position sensor connector.
2. With the throttle closed, use an ohm meter and check for continuity between terminals 1 and 2.

Continuity
Should exist.

3. Open the throttle approximately 50%, use an ohm meter and check for continuity between terminals 1 and 2.

Continuity
Should not exist.

HARNESS TEST:
1. Disconnect the idle switch / throttle position sensor connector and turn the key to the ON position.
2. Using a voltmeter, check the voltage between the harness connector terminal 1 and ground.

Voltage:
4 - 5 volts.

3. Turn the key OFF, disconnect the negative battery cable and the ECM Connector.
4. Using an ohm meter, check for continuity between ECM harness terminal 24 and TPS harness terminal 1.

Continuity
Should exist.


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 ECM. Check for looseness at all harness junctions and test for an intermittent failure.