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Resistance Test

IDLE AIR CONTROL MOTOR (STEPPER MOTOR) CHECK




Checking the Operation Sound
1. Check that the engine coolant temperature is 20 °C (68 °F) or below.

NOTE: Disconnecting the engine coolant temperature sensor connector and connecting the harness-side of the connector to another engine coolant temperature sensor that is at 20 °C (68 °F) or below is okay for this test.

2. Check that the operation sound of the stepper motor can be heard after the ignition is switched ON. (but without starting the motor.)
3. It the operation sound cannot be heard, check the stepper motor's activation circuit.
If the circuit is normal, it is probable that there is a malfunction of the stepper motor or PCM.




Checking the Coil Resistance
1. Disconnect the idle air control motor connector and connect the test harness special tool MD998463.
2. Measure the resistance between terminal 2 (white clip of the special tool) and either terminal 1 (red clip) or terminal 3 (blue clip) of the connector at the idle control motor side.

Standard value: 28 - 33 Ohms [at 20 °C (68 °F)]

If resistance is not within the standard value, replace the IAC motor.

3. Measure the resistance between terminal 5 (green clip of the special tool) and either terminal 6 (yellow clip) or terminal 4 (black clip) of the connector at the idle control motor side.

Standard value: 28 - 33 Ohms [at 20 °C (68 °F)]




Operation check
1. Remove the throttle body.
2. Remove the stepper motor.




3. Connect the special tool MD998463 to the idle air control motor connector.
4. Connect the positive (+) terminal of a power supply (approximately 6 V) to the white clip and the green clip.
5. Connect the negative (-) terminal of the power supply to each clip as described in the following steps. Then check whether or not the stepper motor vibrates slightly as it operates.
1. Connect the negative (-) terminal of the power supply to the red and black clip.
2. Connect the negative (-) terminal of the power supply to the blue and black clip.
3. Connect the negative (-) terminal of the power supply to the blue and yellow clip.
4. Connect the negative (-) terminal of the power supply to the red and yellow clip.
5. Connect the negative (-) terminal of the power supply to the red and black clip.
6. Repeat the tests in the sequence from (5) to (1) to test opposite movement of the IAC.

6. If vibration is detected during the test, the stepper motor can be considered normal.
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