All models are equipped with electronic ignition system. The ignition system consist of the ignition switch, the battery, the coil, the primary and the secondary wiring circuits, ignition wires and spark plugs, the camshaft position sensor, the crankshaft position sensor and the powertrain control module or PCM. The PCM controls ignition timing and spark advance characteristics for the engine. The ignition timing is not adjustable.
The crankshaft sensor and camshaft sensor generate voltage pulses that are sent to the PCM. The PCM then determines the crankshaft position, injector sequence and ignition timing. The PCM also supplies battery voltage to the ignition coil through the automatic shutdown relay also known as the ASD. The PCM also controls the ground circuit for the coil.
If the PCM does not receive a signal from the crankshaft or camshaft position sensors, the PCM signals the ASD relay and fuel pump relay to shut down the ignition and fuel delivery systems respectively.
On four-cylinder engines, the secondary ignition system is controlled by energizing the core drivers in the proper firing order. On V-6 engines, a conventional type distributor with the rotor is used to send ignition voltage to the proper cylinder in the firing order. On V-6 engines, the ignition coil and camshaft position sensor are part of the distributor, which is located on the rear of the engine on the right side cylinder head and driven by the camshaft.
More diagnostic procedures