General System Description

View: Ignition System:

SYSTEM TYPE
Vehicle uses an electronic ignition system with computer controlled spark timing.

COMPONENTS AND OPERATION
Distributor assembly is a unit containing:
- Ignition coil
- Crankshaft position sensor
- Igniter
- Cap and rotor

Crankshaft position sensor provides the powertrain control module engine (PCME) with signals regarding crank angle at 180° intervals (SGT signal) and #1 cylinder TDC (SGC signal). Together with other inputs, PCME calculates ignition timing over the range of vehicle operating conditions.

PCME controlled igniter is the switch regulating current flow through coil primary circuit. Each time current flow is interrupted, high voltage is induced to fire the spark plugs. Except for the initial setting, timing is PCME controlled.

Distributor cap, rotor and high-tension leads direct high voltage from the distributor assembly to each spark plug at the appropriate time as calculated by the PCME.