Closed Throttle Position Switch

Operation

The closed throttle position switch senses whether the accelerator pedal is depressed or not, converts it into high/low Voltage and inputs the Voltage to the engine control module, which then controls the idle air control motor based on the input signal.

A Voltage is applied to the closed throttle position switch from the engine control module.

When the accelerator pedal is released, the closed throttle position switch is turned on to conduct the Voltage to ground. This causes the closed throttle position switch terminal Voltage to go low from high.


Troubleshooting Hints

If the closed throttle position switch harness and individual check results are normal but the closed throttle position switch output is abnormal, the following troubles are suspected.

(1) Poorly adjusted accelerator cable
(2) Poorly adjusted fixed SAS





Inspection




Harness Inspection





Sensor Inspection

(1) Disconnect the throttle position sensor connector.





(2) Check the continuity between the throttle position sensor connector side terminal 3 and terminal 4.





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

NOTE: After replacement, the throttle position sensor and closed throttle position switch should be adjusted.