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Throttle Position Switch: Testing and Inspection
ISC Motor Circuit:
If the PCM detects a decrease in throttle position two times in succession, then the PCM knows the throttle is resting on the ISC plunger and the Throttle Position
Switch (not the same as the Throttle Position
Sensor) should be closed and it sets Code P027. See
Diagnostic Trouble Code PO27 for additional diagnostic information.
