Distributor: Description and Operation

PURPOSE
The distributor is a multi-function assembly.
- It provides the powertrain control module engine (PCME) with input signals related to engine speed and crankshaft position.
- Directs high voltage ignition coil output to the spark plugs in proper sequence (firing order).

OPERATION
The integral crankshaft position sensor sends the PCME signals representing engine speed and crankshaft position. The PCME controls ignition timing by regulating the ground circuit for the internally mounted igniter (in distributor). The igniter switches the primary circuit of the internally mounted ignition coil. The ignition coil sends secondary voltage to the ignition rotor where it gets distributed to the proper cylinder via the distributor cap and ignition cables (high-tension leads).

To accomplish this, the rotor is mounted on the driven shaft and acts as a rotary contact, directing ignition coil voltage to each spark plug terminal as it turns inside the distributor cap.
The distributor is camshaft-driven and turns at half crankshaft speed.

CONSTRUCTION
The distributor assembly houses several components of the ignition system, some of which are not serviceable separately from the assembly itself.

View: Ignition System:

The integral components are as follows:
- Ignition coil
- Igniter
- Crankshaft position sensor

View: Distributor:

Removable components:
- Distributor cap (1)
- Ignition rotor (2)
- Cover (3)