Ignition System - Nippondenso Electronic Subaru Justy I

DESCRIPTION

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

On Subaru models, ignition module is mounted inside distributor.

All other models contain conventional centrifugal and vacuum advance mechanisms.

OPERATION

On all other models, as distributor shaft turns reluctor, reluctor teeth (one for each cylinder) pass magnetic pick-up coil assembly. As air gap changes with approach and pass of each reluctor tooth, magnetic field varies creating a signal in pick-up coil assembly.

Ignition module senses this signal and turns ignition coil primary circuit on and off. This causes magnetic field in coil primary winding to collapse, resulting in a voltage surge in secondary winding, which fires spark plugs.

ADJUSTMENTS

Using a flat, non-magnetic feeler gauge, check air gap between pick-up coil and reluctor. On Justy, air gap should be .012-.016" (.30-.40 mm). On all other models, air gap should be .008-.016" (.20-.40 mm). If air gap is incorrect, loosen screws and adjust air gap.

Primary Coil Resistance

Isolate coil from remainder of system. Measure resistance between coil positive and negative terminals. See IGNITION COIL RESISTANCE table.

Secondary Coil Resistance

Isolate coil from remainder of system. Measure resistance between coil positive terminal and to coil tower. See IGNITION COIL RESISTANCE table.

Coil Insulation Resistance

Isolate coil from remainder of system. Measure resistance between ignition coil positive terminal and distributor housing. Reading should exceed 10 megaohms (infinity).

IGNITION COIL RESISTANCE - OHMS

See also:
• IGNITION COIL RESISTANCE