Subaru Coupes/Sedans/Wagons 1985-1996 Repair Guide

Testing

Print

The majority of the diagnosis and testing of the direct 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.

SPARK PLUG IGNITION COIL



See Figure 1

Click image to see an enlarged view

Fig. Fig. 1: Cutaway view of a direct ignition system's individual ignition spark coil

Each spark plug has a separate ignition coil attached to it.

Primary Coil

See Figure 2

Click image to see an enlarged view

Fig. Fig. 2: Direct ignition primary coil resistance check

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the coil from the spark plug and engine compartment.
  4.  
  5. Using a multimeter or equivalent, measure the resistance between terminals No. 1 and No. 2 of the coil wire harness. The resistance should be between 0.68-0.83 ohms. If not within this range, replace the coil.
  6.  

Secondary Coil

See Figure 3

Click image to see an enlarged view

Fig. Fig. 3: Direct ignition secondary coil current flow check

This procedure requires the use of a digital ammeter or multimeter. Do not use an analog model.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the coil from the spark plug and engine compartment.
  4.  
  5. Using a digital multimeter and a 12 volt power supply, connect the meter in series between the primary and secondary terminals of the coil.
  6.  
  7. Measure the current amount. If the reading is not between 0.29-33 milo-amps, replace the coil.
  8.  

 
label.common.footer.alt.autozoneLogo