Question about 1996 BMW 318

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What is the stepper motor - 1996 BMW 318

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It's called the Idle Air Control motor (IAC). It is on the side of the throttle body. This controls the idle speed. What it does is let in a certain amount of air into the engine, in steps. The more it is open the higher the idle speed. The ECM controls it.

Posted on May 17, 2011

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A stepper motor is a small DC electric motor used to hold a certain position of the shaft it turns or a piston, it is used in electronic speedometers that have a needle and also in other app's like the AC air ducts to move the doors that divert air. It is also used to control idle speed by moving a piston that diverts air around the throttle valve..

Posted on May 17, 2011

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Idle Air Control Motor Circuit Malfunction Possible Causes Setting Conditions • Stepper motor connector is damaged (check pins for damage, and moisture) • Stepper motor Coil 1, 2, 3 or 4 circuit is open or shorted to ground • Stepper motor coil circuit(s) is shorted to voltage • Stepper motor has failed • PCM has failed Engine running; system voltage over 11.5v, and the PCM detected an incorrect voltage on one or more of the IAC motor circuits for 2.75 seconds with the motor enabled.

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Hello, this problem is due to a failing stepper motor. The stepper motor is the motor behind the gauge that controls the
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