Closed Throttle Position Switch

Operation

The closed throttle position switch functions to convert (to HIGH/LOW-level voltage) data as to whether the accelerator is depressed or released, and to input that voltage (as signals) to the engine control module. The engine control module, based upon those signals, regulates the idle-speed control motor.

Voltage within the engine control module is applied, by way of the resistance, to the closed throttle position switch.

When the foot is taken off the accelerator, the closed throttle position switch is switched ON, so the current is grounded.

As a result, the closed throttle position switch terminal voltage changes from HIGH to LOW level.


Troubleshooting Hints

If there is an abnormal condition of the closed throttle position switch output even though the results of the checking of the closed throttle position switch harness and of the component itself indicate normal condition, the cause may be presumed to be one of the following:

(1) Improper adjustment of the accelerator cable or the automatic-cruise-control cable.
(2) Improper adjustment of the fixed SAS.





Inspection







Harness Inspection

Sensor Inspection

(1) Disconnect the idle speed control motor connector.









(2) Check the continuity between terminal 3 and body ground.
(3) If out of specification, replace the idle speed control motor assembly.