Subaru Workshop Service and Repair Manuals

Ignition Coil: Testing and Inspection

Inspection

Ignition Coil Testing

1. Disconnect coil connector and remove coil from engine.
2. Measure resistance of coil primary and secondary windings as follows:

Primary
All Transmissions (Diamond & Hitachi Coils)

Terminal (Connector E10) ...........................................................................................................................................................................  Resistance         

1 - 2 ..........................................................................................................................................................................................................  0.62 - 0.77 Ohms
2 - 3 ..........................................................................................................................................................................................................  0.62 - 0.77 Ohms

Secondary
Manual Transmission (Diamond)

Terminal .......................................................................................................................................................................................................  Resistance         

1 - 2 ........................................................................................................................................................................................................  17.9 - 24.5K Ohms
3 - 4 ........................................................................................................................................................................................................  17.9 - 24.5K Ohms

Automatic Transmission (Hitachi)

Terminal .......................................................................................................................................................................................................  Resistance         

1 - 2 ........................................................................................................................................................................................................  10.4 - 15.6K Ohms
3 - 4 ........................................................................................................................................................................................................  10.4 - 15.6K Ohms