Location Of The Throttle Opener Vacuum Diaphragm

How To Test The Idle Switch of the TPS (1.6L Toyota Corolla -1.6L Geo Prizm)

NOTE: The Throttle Opener Diaphragm Assembly is used only on the 1989 to 1992 1.6L Corollas. It's located on the throttle body assembly under the throttle plate linkage (see orange arrow in image above).

A vacuum hose connects to the Throttle Opener Assembly's vacuum inlet port. You'll need to disconnect the vacuum hose that's attached to the inlet port and attach your vacuum pump to it.

Location Of The Throttle Stop Screw

How To Test The Idle Switch of the TPS (1.6L Toyota Corolla -1.6L Geo Prizm)

NOTE: To check and/or adjust the TPS assembly, you need to place a feeler gauge between the throttle stop screw and throttle lever.

The arrow labeled with the number 1 points to the idle stop screw. The arrow labeled with the number 2 points to the throttle lever.

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Toyota Vehicles:

  • Corolla 1.6L
    • 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997

Geo Vehicles:

  • Prizm 1.6L
    • 1993, 1994, 1995, 1996, 1997