Warning! Before performing work, read the precautions for repairing the engine management system (see "Checking the technical condition of the engine management system").
To complete the work you will need:
- multimeter (in voltmeter and ohmmeter mode);
- pieces of wire.
Examination
1. Prepare the car for work (see "Preparing the car for maintenance and repair").
2. Release the wiring harness connector retainer and disconnect the connector from the idle speed control valve.
3. Connect the negative probe of the voltmeter to the engine ground.
4. Turn on the ignition and use a voltmeter to measure the voltage at terminals A and D of the wiring harness connector (terminal designations are printed on the socket).
Note: The voltage must be at least 12 V. If the voltage does not reach the connector or is less than 12 V, the battery is discharged, the power supply circuit is faulty, or the ECU is faulty.
Warning! After completing the voltage measurement, turn off the ignition.
Removal
1. Using a Phillips screwdriver, unscrew the two screws securing the idle speed control to the throttle body.
2. Remove the idle speed control valve.
3. Using an ohmmeter, measure the resistance between the terminals of the windings.
Note: The electrical resistance between terminals A-B and C-D should be about 53 ohms. The resistance between terminals A-C and BD should be greater (strive for infinity). A faulty regulator must be replaced.
Installation
Warning: Before installing a new regulator, make sure that the valve needle protrudes no more than 23 mm.
1. Using a caliper with a depth gauge, measure the protrusion of the needle of the new valve.
2. If the valve protrusion is more than 23 mm, we press the valve into the body as follows:
a) connect the positive terminal of the battery with the D terminal of the regulator using a wire (the connection of the wire to the terminal must be insulated);
b) with the bare end of the wire connected to the negative terminal of the battery, briefly touch terminal C of the harness connector. Since the valve moves very slowly, we perform the touches multiple times, reproducing the operation of a pulse power supply.
3. We check the condition of the sealing ring by visual inspection. We replace the damaged ring.
4. Install the regulator in the reverse order of removal.