Subaru Coupes/Sedans/Wagons 1985-1996 Repair Guide

Testing

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The majority of the diagnosis and testing of the distributorless ignition system is performed via the self-diagnosis function of the fuel injection control unit. See Electronic Engine Controls in Driveability & Emissions Controls for more information.

IGNITION COIL



See Figure 1

Click image to see an enlarged view

Fig. Fig. 1: Cylinder designation and terminal numbers on coil assembly-2.2L and 2.5L engines

Primary Resistance

The coil does not have to be removed from the vehicle to perform this test.

  1. Disconnect the negative battery cable.
  2.  
  3. Tag, then remove each spark plug wire from the ignition coil.
  4.  
  5. Using a multimeter, check the resistance between spark plug wire connections No. 1 and No. 2. Then check the resistance between spark plug connections No. 3 and No. 4. If the resistance between the connections is between 0.59-0.79 ohms, the coil is within specification. If the resistance is below this amount, replace it.
  6.  

Secondary Resistance
  1. Disconnect the negative battery cable, if not already done.
  2.  
  3. Tag then remove each spark plug wire from the ignition coil, if not already done.
  4.  
  5. Using a multimeter, check the resistance between wire harness connections No. 1 and No. 2. Then check the resistance between wire harness connections No. 2 and No. 3. If the resistance between the connections is between 17-24 kilo-ohms, the coil is within specification. If the resistance is below this amount, replace it.
  6.  

 
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