Eclipse GT V6-3.0L SOHC (2000)
Idle Air Control Motor: Testing and Inspection
Resistance Test
IDLE AIR CONTROL MOTOR (STEPPER MOTOR) CHECK
Checking the Coil Resistance
1. Check that the engine coolant temperature is 20°C (68°F) or below.
NOTE: If necessary, you can disconnect the engine coolant temperature sensor connector and connect the harness-side of the connector to
another engine coolant temperature sensor that is at 20°C (68°F) or below.
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. If 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 engine control module <M/T> or powertrain control
module <A/T>.
Checking the Coil Resistance
1. Disconnect the idle air control motor connector.
2. Measure resistance between terminal 2 and either terminal 1 or terminal 3 of the connector at the idle air 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 and either terminal 6 or terminal 4 of the connector at the idle air 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.
Operation Check
1. Remove the throttle body.
2. Remove the idle air control motor.
3. Connect special tool MB991709 to the idle air control motor connector.
4. Connect the positive (+) terminal of a power supply (approximately 6 Volts) to terminal 2 and the terminal 5.
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 terminal 1 and terminal 4.
2. Connect the negative terminal of the power supply to terminal 3 and terminal 4.
3. Connect the negative terminal of the power supply to terminal 3 and terminal 6.
4. Connect the negative terminal of the power supply to terminal 1 and terminal 6.
5. Connect the negative terminal of the power supply to terminal 1 and terminal 4.
6. Repeat the tests in 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 to be normal.
