Ignition Coil: Testing and Inspection

Two different ignition coils are used on cars with CIS-E III injection systems.

Fig. 24 Ignition Coil I.D., Version I:

Version I
Disconnect the harness plug from the ignition coil power stage.
Remove the high tension wire from the coil.

Fig. 25 Ignition Coil I.D., Version II:

Version II
Disconnect the harness plug from the ignition coil power stage.
Remove the high tension wire from the coil
Remove the screw from the terminal lug cover to gain access to the terminals.

Fig. 26 Harness Plug Terminal I.D.:

1. Connect a multi-meter between terminals 1 and ground, then between terminals 1 and 3 of the harness plug.
2. With the ignition ON, battery voltage should be available in both cases.
3. If voltage is not as specified, repair wiring as necessary.

4. Connect a multi-meter between terminals 2 and 3 of the harness plug. At least 2 VDC should be available while cranking the starter.

NOTE: An LED test light (us 1115 or equivalent) could be used instead of the volt meter. The LED should flicker while cranking the starter.

a. If voltage is not within specification, check wiring between terminal 2 of the harness plug, and terminal 16 of the ignition control unit.
b. If the wiring is OK, replace the ignition control unit.
c. If the voltage is OK, test the ignition coil.

Fig. 12 Ignition Coil, Version I:

Fig. 13 Ignition Coil, Version II:

5. Check resistance between terminals 1 and 4 of the coil. Resistance should be 5000 - 6000 ohms.
6. Check resistance between terminals 1 and 15 of the coil. Resistance should be 0.5 - 1.5 ohms.
7. If either resistance value is not within specification, replace the ignition coil with its' power stage.

NOTE: The function of the power stage is not to be tested on either version.