Measuring the resistance of the primary winding of the ignition coil
Pic. 7.13. Measuring the resistance of the primary winding of the ignition coil
Measure the resistance between terminals 1 and 2 of the ignition coil (ignition coil for cylinders #3 and #6), terminals 2 and 4 of the ignition coil (ignition coil for cylinders #1 and #4) and terminals 2 and 3 of the ignition coil (ignition coil for cylinders #2 and #5) (pic. 7.13).
Rated value: 0.74±10% ohm.
Measuring the resistance of the secondary winding of the ignition coil
Pic. 7.14. Measuring the resistance of the secondary winding of the ignition coil
Measure the resistance of the secondary winding between the high voltage coil leads #3 and #6, #1 and #4, #2 and #5 (pic. 7.14).
Rated value: 13.3±15% kΩ.
Attention! When measuring the resistance of the secondary winding, the connector of the ignition coil must be disconnected.
Checking and cleaning
Pic. 7.15. Removing spark plug wire
Disconnect high voltage spark plug wires from spark plugs (pic. 7.15).
Note. When disconnecting the high voltage spark plug wire, pull on the insulating cap, not the wire itself. Otherwise, the wire may be damaged.
Using a spark plug tool, remove the spark plugs from the cylinder head
Attention! Be careful not to allow dirt to enter the engine cylinders through the spark plug hole.
Pic. 7.16. Spark Plug Components to Test
Check the spark plugs for the defects listed below (pic. 7.16).
- 1. Insulator damage
- 2. Electrode burnout
- 3. Nagar
- 4. Damaged or cracked sealing washer
- 5. The condition of the enamel insulator at the end of the candle (absence of breakdown marks on the surface).
Pic. 7.17. Gap between spark plug electrodes
Check the gap between the spark plug electrodes with a feeler gauge and adjust if necessary (pic. 7.17).
Nominal value: 1.0 - 1.1 mm.
Install spark plugs and tighten to rated torque. If the spark plugs are tightened to a torque greater than the nominal value, the threads in the cylinder head may be damaged.
Tightening torque: 20–30 Nm.
Attention! When replacing a spark plug, the new spark plug must have a built-in resistor.