Mixture Control Valve (2T-C Engine Only)
- With vehicle on dynamometer or rear wheels raised, bring vehicle speed (speedometer) to intermediate or high speed. When mixture control system is on, release throttle for sudden engine deceleration. Momentary vacuum should be felt by placing hand at bottom of control valve when system is on. See Fig 1.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- With engine idling, disconnect mixture control valve vacuum sensing hose. Place hand at bottom of valve. If vacuum can be felt, mixture control valve must be replaced.