Throttle Full Close Switch: Testing and Inspection

Idle Position Switch Circuit:

Engine Control Module Connector--For Pin Applications See Components:

TIP:
If the closed throttle position switch harness and individual check results are normal but the closed throttle position switch output is abnormal, the following should be checked;
- Poorly adjusted accelerator cable
- Poorly adjusted fixed SAS--Speed Adjusting Screw

COMPONENT TEST
1. Disconnect the motor position sensor connector.
2. With the throttle closed, use an Ohm meter and check for continuity between terminal 4 and ground.
Continuity Should exist.

3. With the throttle closed, use an Ohm meter and check for continuity between terminals 3 and 4.
Continuity Should exist.

4. Open the throttle, use an Ohm meter and check for continuity between terminals 3 and 4.
Continuity Should not exist.

HARNESS TEST:
1. Disconnect the sensor connector and turn the key to the ON position.
2. Using a Voltmeter, check the Voltage between the harness connector terminal 3 and ground.
Voltage: 4 - 5 Volts.

3. Turn the key OFF, disconnect the negative battery cable and the ECU Connector.
4. Using an Ohm meter, check for continuity between ECU harness terminal 67 and ISC harness terminal 3.
Continuity Should exist.

5. Using an Ohm meter, check for continuity between ECU harness terminal 67 and ground.
Continuity Should not 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 ECU. Check for looseness at all harness junctions and test for an intermittent failure.