Distributor: Testing and Inspection

IGNITION COIL & POWER TRANSISTOR
The power transistor switches on and off the ignition coil primary circuit according to the ECM signal. As the primary circuit is turned on and off, the proper high voltage is induced in the secondary circuit. The distributor is not repairable except for the distributor cap and rotor head.








POWER TRANSISTOR
1. Disconnect camshaft position sensor & power transistor harness connector and ignition coil harness connector.
2. Check power transistor resistance between terminals 2 and 8.

If NG, replace distributor assembly.

Step 10:

IGNITION COIL
1. Disconnect ignition coil harness connector.
2. Check resistance as shown in the figure.

Terminal Resistance [at 25°C (77°F)]
7 - 8 (Primary coil) 0.5 - 1.0 ohms
7 - 9 (Secondary coil) Approximately 12 K Ohms

For checking secondary coil, remove distributor cap and measure resistance between coil tower metal tip 9 and terminal. If NG, replace distributor assembly as a unit.