Subaru 22433AA480 Ignition Coil Assembly

Non-turbocharged models can have their ignition coils' primary and secondary resistance checked. One has to remove the four-terminal connector from the coil and test the continuity between terminals 1 and 2 as well as between terminals 2 and 4 when checking for primary resistance. If the multimeter does not show any reading within a determined range, this signifies that it should be replaced. It is necessary to put an ohmmeter across a pair of spark plugs on each cylinder head, which are connected by pairs of HT leads along the Vee engine's top. If you receive readings out of range, replace your coil with another new one in stock. However, one cannot check these figures on turbocharged models per individual coil-over-plug unit. A defective spark or weak sparks from only one coil point to broken circuit or a bad coil respectively. To replace an ignition coil on non-turbocharged models disconnect negative battery terminal, detach electrical connector and spark plug wires from the coil, ease off mounting bolts for ignition coils and then proceed to screwing back new ones in reverse order they were removed; while replacing an ignition coil on turbocharged models remove negative battery terminal, remove electrical connector screws from window washer motor (left side), or ignitions coils (right side), unbolted retaining bolt of an ignition coil next removes it off by pulling straight up at its side from spark plug site,and then detach the coil unit from the spark plug by pulling it straight out to the side.

To do this, one has to take off the ignition coil(s) and cleanse them using a wet towel but ensure their complete drying. Check every coil for cracks, damage, and carbon tracking. If there is any damage discovered on the coil then it should be replaced.

Cracks, damage, and carbon tracking.

Cracks, damage, and carbon tracking.

The first step is to disconnect the cable from the negative battery terminal.