Cylinder Identification (CID) Sensor

CID sensor is not used on 2.2L non-turbo engines. On all other models, CID sensor is located inside the distributor. On 1.8L models, a fixed-position, photo-sensor-type CID unit and CID disc are used. On 2.2L turbo models, 2 fixed-position, magnetic pick-up CID units and CID rotor are used.

On 1.8L engines, a slotted disc rotates with the distributor shaft and passes through the CID photo sensor. As the slot passes through the sensor, TDC compression stroke of cylinder No. 1 is indicated to the ECA. This signal affects injector timing.

On 2.2L turbo engines, a rotor is mounted on the distributor shaft and rotates past 2 fixed magnets. As the rotor passes the magnets, TDC of cylinder No. 1 and No. 4 are identified. This signal affects injector timing and ignition timing.