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Slow Fuel-Cut System Test

Connect voltmeter to terminal "F" (Light Green wire) of carburetor connector. Increase engine speed to 3000 RPM. Lift idle switch arm. See Figure and Fig 1 . Voltmeter should indicate 12 volts at greater than 2500 RPM, and less than 1.5 volts at less than 2500 RPM. Check slow fuel-cut solenoid and terminal "2D" of ECU if system fails. See PIN VOLTAGE CHARTS and SENSOR OPERATING RANGE CHARTS articles.

Fig 1: Checking Slow Fuel-Cut System

Courtesy of MAZDA MOTORS CORP.