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SENSORS AUTO PARTS: IDLE CONTROL VALVE
HOW TO DETECT THE IDLE AIR CONTROL VALVE FAILURE
You need a multimeter to check the component serviceability. First, check that there are no breaks in the valve's power supply circuit. For this, set the gauge to the voltmeter mode, connect its negative wire to the negative terminal on the engine body, and the positive wire - to the corresponding valve terminals that are typically marked with A and D symbols. If there is no voltage, check the circuit continuity and the ECU serviceability.
Then set the gauge to the ohmmeter mode and measure resistance between the valve terminals A and B, and then - between C and D. It should be 40-80 Ohms. After that, connect the multimeter probes in pairs to terminals A and C, B and D. If the valve is in good working order, the gauge will indicate an open circuit.
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