Corolla & Tercel Wagon

Warm engine to normal operating temperature. Check idle speed and adjust if necessary. Disconnect hose from TVSV "M" port and plug "M" port. See Figure. This disconnects choke opener and EGR system.

Fig 1: Disconnecting TVSV Port
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect and plug vacuum hose from TP. See Figure. Engine speed should now be 1400 RPM on Tercel Wagon models and 900 RPM on Corolla models. If not within specification, rotate adjusting screw to obtain correct engine speed. See Figure.
NOTE: Engine speed should be adjusted with cooling fan off.
Reconnect vacuum hose to TP. Check that engine returns to idle speed within 2-6 seconds. Reconnect TVSV "M" port vacuum hose. If no problem exists, system is okay.

Fig 2: TP Vacuum Hose & Adjusting Screw Location (Corolla & Tercel Wagon)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 3: TP Vacuum Hose & Adjusting Screw Location (Corolla FX)

Fig 4: TP Vacuum Hose & Adjusting Screw Location (Tercel Sedan)