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 air 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 otf the accelerator, the closed throttle position switch is switched ON, so the current is grounded.

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


Troubleshooting Hints

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

(1) Improper adjustment of the accelerator cable or the automatic cruise control cable.
(2) Improper adjustment of the closed throttle position switch (fixed SAS).





Inspection






Harness Inspection



Sensor Inspection

(1) Disconnect the throttle position sensor connector.





(2) Check the continuity between terminal 1 and body ground.





(3) If out of specification, replace the throttle position sensor assembly.