PI72: Throttle Position Switch

Throttle position switch is part of Idle Speed Control (ISC) motor. Switch opens when throttle cam is lifted off ISC motor. Switch closes when throttle cam rests on ISC motor. Test detects opening and closing of throttle position switch at PCM terminal 2A7. See Figure . PI72 should be LO with accelerator pedal released and HI with accelerator pedal depressed.