Distributor: Description and Operation

Distributor Assembly:

PURPOSE
Directs high voltage ignition coil output to spark plugs in proper sequence (firing order). A rotor on the driven shaft acts as a rotary contact, directing ignition coil voltage to each spark plug terminal as it turns inside the distributor cap.

LOCATION
Left end of cylinder head.

OPERATION
The crank angle sensor generates two signals utilized by the ECU in its calculations for ignition timing and other outputs. The sensor is a magnetic pick-up type with reluctor (signal rotor) turned by the distributor shaft. The "Ne" signal detects crank angle at 30° intervals and is utilized by the ECU to determine engine rpm. The "G1" and "G2" signals detect #1 and #4 cylinders TDC and are utilized by the ECU to determine fuel injection and ignition timing. Spark advance is controlled by the ECU without centrifugal or vacuum advance mechanisms.