Ignition System: Description

The electronic ignition system consists of a breakerless distributor, an ignitor, a pick-up coil, ignition coil and related wiring. Distributor contains a reluctor, breaker plate and pick-up coil assembly.

Toyota Pickup & 4Runner (EFI) models use an Electronic Spark Advance (ESA). The engine Electronic Control Unit (ECU) uses data supplied by various engine sensors to provide optimum ignition timing under all conditions.

Carbureted Pickup and 4Runner models are equipped with vacuum and centrifugal advance mechanisms in the distributor. The vacuum advance may be controlled by a computer activated solenoid, a thermostatic switching valve, or the High Altitude Compensation (HAC) system.

Some Toyota models use an Integrated Ignition Assembly (IIA) that has the ignition coil and ignitor mounted on the distributor.

NOTE: For more information on computer diagnosis and wiring diagrams, see TOYOTA COMPUTER CONTROL SYSTEM article in COMPUTERIZED ENGINE CONTROLS section.