Ignition Systems: 1.8L

The Electronic Spark Advance (ESA) system uses an ignition module, Crankshaft Position Sensor (CPS) and ECA to regulate ignition timing. Piston position and engine RPM are monitored by Crankshaft Position Sensor (CPS) and Cylinder Identification (CID) sensor.

The CPS creates 4 evenly spaced signal pulses as slots in the outer edge of the disc pass through it. These signals are used to control transistors in the ignition module to break the primary circuit in the ignition coil. The CPS also supplies the ECA with information for engine RPM and injector timing.

The CID sensor creates one signal pulse per distributor revolution as the inner slot of the disc passes through. This signal is sent to the ECA to identify No. 1 cylinder TDC (compression stroke) for calculation of injection timing.