Inspection Procedure

TESTING OF THE SYSTEM USING THE SCAN TOOL

NOTE: When the vehicle is new [driven approximately 500 km (300 miles) or less] the number of steps may be about 30 steps greater than the standard value indicated above.

CAUTION: When the select lever is shifted to the D position, the brakes must be used to prevent the vehicle from moving forward.

IDLE AIR CONTROL MOTOR (STEPPER MOTOR) TESTING



Checking Operation Sound
1. Check that the operating sound of the stepper motor can be heard over the idle air control motor when the ignition switch is turned to the ON position (without starting the engine) .
2. If no operating sound can be heard, check the stepper motor drive circuit. (If the circuit is good, a defective stepper motor or engine control module is suspected).




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

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

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

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




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HARNESS INSPECTION




Checking Actuator Operation (Off the Car)
1. Remove the throttle body.
2. Remove the stepper motor.
3. Connect the special tool (test harness) to the idle air control motor connector.
4. Connect the positive terminal of a power source (approx. 6 V) to the white clip or the green clip.







5. While holding the idle air control motor as shown in the illustration, connect the negative power source terminal to each clip in the sequence described below, and check whether or not there is vibration (a feeling of very slight shaking of the stepper motor) as a result of activation of the stepper motor.
1. Connect the negative power source terminal to the red and black clips.
2. Connect the negative power source terminal to the blue and black clips.
3. Connect the negative power source terminal to the blue and yellow clips.
4. Connect the negative power source terminal to the red and yellow clips.
5. Connect the negative power source terminal to the red and black clips.
6. Repeat the test in the reverse (5-1) sequence.

6. If vibration is felt as a result of this test, the stepper motor can be considered to be normal.