Contents: Examination ⇓ Replacement ⇓
Examination
Caution! When performing checks with the engine off, keep your hands, clothing, hair, etc. away from rotating parts.
1. The engine idle speed is controlled by the idle speed control valve. The idle air control valve regulates the amount of air that bypasses the throttle valve and enters the intake manifold. The valve is controlled by the control unit depending on the engine operating conditions (whether the engine is cold or hot, whether the air conditioning is on, what mode the power steering is operating in, etc.).
2. Tighten the parking brake, put the pads under the wheels and turn on the "neutral" in the gearbox (manual transmission) or "parking" (automatic transmission). Connect a tachometer to the engine (following the manufacturer's instructions). Start the engine and run it at 3000 rpm until the cooling fan comes on. Wait until the fan turns off, reduce the engine speed to idle and watch the tachometer. If the idle speed corresponds to the Technical Data, then the idle air valve is working properly. If the idle speed is below the required level, disconnect the electrical connector from the idle air control valve (figure 14.2,a,6). If the connector is disconnected, the engine speed will fluctuate. If this doesn't happen, the idle air control valve is likely faulty.
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3. Measure the resistance between the valve contacts. It should be within 7.7-9.3 Ohms (for 4-cylinder engine), 10.7-12.3 Ohm (for V-shaped engines produced from 1993 to 1997.) or 9.7-10.5 Ohm (for V-shaped engines produced since 1998.).
4. If the valve resistance is within the specified values and the engine idles erratically, have the electrical system checked by a qualified technician.
Replacement
5. Disconnect the electrical connector from the valve.
6. Remove the two screws and remove the valve from the throttle body.
For details, see the website (mazbook)
7. The valve is installed in reverse order. Replace the valve sealing ring when installing.