Last update: 2009-01-11
This illustration is a ignition unit mechanism. When a central thyristor is concerned with a gate with a signal from a signal coil, it connects a circuit in order to discharge electricity with a condenser. When electric potential of Anode (A) is high it is on, when electric potential of Cathode (K) is high, it is off. The Capacitor is charged by generator current. When a Capacitor receives a signal, it discharges electricity to primary coil of an ignition coil.
When a trouble caused in one of the ignition unit, will not spark for any of cylinders. In an example of chart below, a thyristor of ignition unit 2 does continuity. When one of a thyristor has done continuity, most electric currents have flowed to ground, and a condenser of other units can not charge. Therefore, in the non spark trouble, it must inspect all ignition units. Ignition unit trouble Test procedures
Step 1. Check resistance between the Black and Light Green wires using the Rx10 range of the ohmmeter.
| Connect to + | Connect to - | R x 10 = Value |
|---|---|---|
| Black | Light Green | ∞ (no reading) |
| Light Green | Black | ∞ (no reading) |
Step 2. Check resistance between the Light Green and Red wires using the Rx100 range of the ohmmeter.
| Connect to + | Connect to - | R x 100 = Value |
|---|---|---|
| Black | Red | For either measurement the meter needle should jump and then return to infinity (no reading). |
| Red | Black |
