Technician A says the TPREL PID is the PCM's closed throttle reference voltage. Technician B says an idle trim relearn procedure should be done whenever a part of the IAC system is replaced or a repair is made to something that affects idle speed. Who is correct?

Question

Quizplus · Accepted Answer

The TPREL PID is indeed the PCM's closed throttle reference voltage, as stated by Technician A. Technician B is correct in stating that an idle trim relearn procedure is necessary after replacing any part of the IAC system or making repairs affecting idle speed, to ensure proper idle control.

Technician a Says the TPREL PID Is the PCM's Closed