Ignition Coil Pack: Testing and Inspection

CHECKING IGNITION COILS

NOTE: Check connecting wires between power output stage and ignition coils as well as between ignition coils and terminals in connector blocks for corrosion or damaged insulation.

CHECKING SECONDARY RESISTANCE
- Disconnect ignition wires from ignition coils.

Ignition Coil Resistance:

- Connect multimeter (Fluke 83 or equivalent) between both ignition wiring connections of ignition coil being tested.

Specified Value: 9-14K ohms

If specified value is not obtained on any one ignition coil:
- Replace ignition coil.

CHECKING PRIMARY RESISTANCE
- Disconnect 3-pin connectors from ignition coil and power output stage.
- Check connectors for loose, corroded or displaced terminals and repair as necessary.

NOTE: The correct terminal assignment in the connector is essential since positive voltage is supplied via all three terminals to the ignition coils.

3-Pin Connector:

- Connect one multimeter test leads between ignition coil connector terminal in connector bracket...

3-Pin Connector:

- ...and 3-pin power output stage connector (for each coil).

Specified Value: max. 5.0 Ohms.

If specified values are not obtained for any coil:
- Replace ignition coil.

CHECKING BATTERY POSITIVE VOLTAGE (B+) SUPPLY FOR IGNITION COILS
- Fuse for ignition coils must be OK.
- Disconnect white harness connector at connector holder.
- Switch ignition on.

3-Pin Connector:

- Switch Fluke 83 multimeter to voltage range and connect in sequence between Ground (GND) and all three terminals of the connector.

Specified Value: approx. battery voltage.

If the specified values are not obtained:
- Check for open circuit using wiring diagram, repair as necessary, also check fuses.