Idle Speed Actuator

CIRCUIT DIAGRAM





USING SCAN TOOL








HARNESS INSPECTION PROCEDURE

ACTUATOR INSPECTION
Operation Sound Check
1. Check for the sound of the stepper motor after the ignition is switched ON (but without starting the motor).
2. If the operation sound cannot be heard, check the stepper motor's circuit.
3. If the circuit is normal, then the problem may be the stepper motor or the ECM








Resistance Measurement between terminals Measure the resistance between the respective terminals.

Operation check
Apply voltage as follows and check whether or not stepper motor movement occurs.
- Connect the power supply (approximately 6V) terminal (+) to terminals 2 and 5 of the connector.
- Connect the power supply (-) terminal to terminals 3 and 4
- Connect the power supply (-) terminal to terminals 3 and 4
- Connect the power supply (-) terminal to terminals 3 and 6
- Connect the power supply (-) terminal to terminals 1 and 6
- Connect the power supply (-) terminal to terminals 1 and 4.




TROUBLESHOOTING HINTS
1. If the stepper motor step increases to 100 to 120 steps or decreases to 0 step, check for faulty stepper motor or open circuit in the harness.
2. If the idle speed control motor is normal but the stepper motor steps are out of specification, check the following items;
1) Poorly adjusted reference idle speed
2) Deposit on the throttle valve
3) Air leaking into the intake manifold through gasket gap
4) Loose EGR valve seat
5) Poor combustion in the cylinder (faulty ignition plug, ignition coil, injector, low compression pressure, etc.)