Throttle Controls: Notes

NOTE: When testing throttle control systems, tachometer may be required. Ensure tachometer is connected to proper terminals. For tachometer connections, see IDLE SPEED & MIXTURE in ADJUSTMENTS article.

Throttle Opener (Paseo Calif. & A/T Models, Pickup 3.0L, Supra, Tercel Calif. Models, T100 & 4Runner 3.0L)

Warm engine to normal operating temperature. Ensure idle speed is correct. See IDLE SPEED & MIXTURE in ADJUSTMENTS article.
Disconnect and plug vacuum hose at throttle opener, located on side of throttle body. Start engine. Maintain engine speed at 2500 RPM. Release throttle and note engine speed. Engine speed should be within specification. See THROTTLE OPENER SPECIFICATIONS table.
Replace throttle body if engine speed is not within specification. Reinstall vacuum hose on throttle opener. Start engine and ensure engine returns to correct idle speed.

Fig 1: Adjusting Throttle Opener (Camry 2.2L Shown; Others Similar)

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THROTTLE OPENER SPECIFICATIONS

Application

⁽¹⁾ Engine RPM

Paseo (Calif. & A/T Models)

1200-1800

⁽¹⁾	With electric cooling fan turned off (if equipped).