Warning! High voltage is generated in the ignition system. Be careful and observe all necessary precautions when servicing any components of the system, including not only the main ones (ignition module, coil, distributor and high-voltage wires), but also related ones, such as spark plug connectors, tachometer and other equipment.
The microprocessor-based programmable ignition system (PGM-IG) continuously optimizes the ignition timing based on engine speed, coolant temperature, throttle position and manifold vacuum. All necessary data is supplied to the on-board processor control module (PCM) by the relevant information sensors, such as the crankshaft position/TDC sensor (TDC), piston position sensor (CYP), throttle position sensor (TPS), electronic coolant temperature sensor (ECT) and absolute line pressure (MAP) sensor. Different ignition timing settings are used during engine warm-up, idling and under load. The corresponding adjustments are made by the PGM-IG system. The ignition system also includes the ignition switch/key, battery, ignition coil, distributor, ignition control module (ICM), spark plug kit, and ignition wires. On 4-cylinder models, the ignition coil is built into the distributor, while on V6 models, it is mounted externally, next to the distributor.
The ignition distributor on all models is driven by the camshaft. The ignition timing is adjusted by the electronic engine management module (PCM). All models are equipped with a crankshaft position sensor (CPS), which is mounted under the lower timing belt cover, next to the crankshaft toothed wheel. The TDC sensor on 4-cylinder models is mounted near (opposite) the CPS sensor; on V6 models there are two TDC sensors: #1 and #2, mounted behind the camshaft gears on the front end of the cylinder heads. The piston position sensor (CYP) on 4-cylinder models and the ignition control model on all models are mounted inside the distributor. For all questions, please contact your service center.