1. Prepare the vehicle for operations (see "Preparing a car for maintenance and repair").
2. Having released the retainer, we disconnect the wiring harness block from the ignition coil.
3. Connect the negative probe of the voltmeter to the engine ground and, turning on the ignition, measure the supply voltage at terminal "15" (middle) of the wiring harness block.
The voltage must be at least 12 V. If the voltage does not reach the connector or is less than 12 V, there is a fault in the power supply circuit, the battery is discharged, or the ECU is faulty.
4. Turn off the ignition.
5. Remove the air filter housing (see "Air filter housing - removal and installation").
6. Clean the coil from dirt.
7. Disconnect the high-voltage wire tips from the ignition coil.
8. Connect the ohmmeter probes one by one to the high-voltage terminals of coil 1-4 and 2-3 and measure the resistance of the secondary windings. For a working coil, it should be within 5.0-6.0 kOhm.
9. To check the short circuit of the primary windings to "ground", connect the ohmmeter probes to the middle terminal "15" of the connector and to the metal part of the coil body. If the resistance tends to infinity, there is no short circuit.
10. To check for a break in the primary winding circuits, connect the ohmmeter probes to the extreme terminals "1a" and "1b" of the coil connector. If the resistance tends to infinity, then there is a break in the circuit and the coil must be replaced.
11. To remove the ignition coil with a hex key by 5 mm we unscrew the four mounting screws and remove the coil.
Installation
The ignition coil is installed in the reverse order. In this case, we connect the high-voltage wires to the coil in accordance with the cylinder numbers printed on the coil body next to the terminals.