Attention! Due to the generation of high voltage in the ignition system, be extremely careful when servicing or checking components of this system. This applies not only to coils and spark plugs, but also to test equipment.
1. Relieve pressure in the fuel system (see chapter 4). When performing checks on the ignition system, the fuel system must be turned off.
2. If the engine cranks but does not start, disconnect each ignition coil from the corresponding spark plug (see paragraph 7) and connect a calibrated tester for the ignition system to it (pic. 6.2). These testers are available at many auto parts stores.
Pic. 6.2. Turn out bolts and remove the ignition coil (do not disconnect the electrical connector), plug the tester into the case at each end of the coil, connect the tester to a convenient grounding point, and turn on the starter. If there is enough power to activate the spark plug, an ignition spark will be visible between the electrode ring and the tester body
3. Turn the engine over while watching the tester for bright blue, well-defined sparks.
4. If sparks occur, sufficient voltage is being supplied to the spark plugs to activate them. Repeat this test on each spark plug to make sure all ignition coils are working properly. If a spark does not appear in a spark plug, most likely the ignition coils for this plug are faulty. However, the cause may be contamination of the candle itself. Therefore, remove the candle and check it, as written off in chapter 1. If several spark plugs are dirty, it is recommended to install a set of new spark plugs. This gives confidence that the interelectrode gaps in them are the same, and the electrodes are R in the same state.
5. If all spark plugs do not generate sparks at all or are generated irregularly, check the battery voltage supply to the ignition coils. If there is no battery voltage, check the ignition system fuse. The ignition system fuse is located in the fuse and relay box in the engine compartment. It may be abbreviated «IGN», «AM» or some other acronym. Refer to the fuse table in the owner's manual that came with your vehicle for the name and number of the ignition fuse.
6. To check for the presence of diagnostic trouble codes stored in memory (DTC), relating to the ignition system, camshaft position sensor (CMP), crankshaft position sensor (CKP), other sensors and/or powertrain control module (RSM), use a suitable DTC reader or tester.