Actuator Inspection

ACTUATOR INSPECTION

Checking the Operation Sound

1. Check that the operation sound of the stepper motor can be heard after the ignition is switched ON (but without starting the motor).

2. 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 of the engine control module.


Checking the Coil Resistance

1. Disconnect the idle speed control servo connector.

2. Measure the resistance between terminals (2) and (1) or between terminals (2) and (3) of the idle speed control servo connector.

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

3. Measure the resistance between terminals (5) and (6) or between terminals (5) and (4) of the idle speed control servo connector.

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



Operation Check

1. Remove the throttle body.

2. Remove the stepper motor.






3. Apply voltage as indicated below and check for presence/ absence of vibration due to stepper motor operation.

a. Connect the positive terminal of the power supply (about 6V) to terminals (2) and (5) of the connector.
b. Connect the negative terminal of the power supply to terminals (3) and (6).
c. Connect the negative terminal to terminals (1) and (6).
d. Connect the negative terminal to terminals (1) and (4).
e. Connect the negative terminal to terminals (3) and (4).
f. Connect the negative terminal to terminals (3) and (6).
g. Connect the terminals in sequence from step 6 to 2.

4. If vibration is felt as a result of the inspections, the stepper motor can be judged as normal.