Subaru Coupes/Sedans/Wagons 1985-1996 Repair Guide

Fuel Injector

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REMOVAL & INSTALLATION



See Figure 1

Click image to see an enlarged view

Fig. Fig. 1: SPFI fuel injector removal

  1. Disconnect the negative battery cable.
  2.  

This procedure may be performed with the throttle body mounted on the intake manifold or removed. If the throttle body is mounted on the intake manifold during servicing, ensure that debris does not fall into the intake manifold through the throttle body.

  1. Remove the air intake boot.
  2.  
  3. Remove the injector cap and gasket.
  4.  
  5. Disconnect the injector electrical harness.
  6.  
  7. Hold the injector body using pliers to avoid risk, then pull the injector from the throttle body.
  8.  
  9. Remove the O-ring and discard.
  10.  

To install:
  1. Using a new O-ring coated with clean engine oil, install the injector in the throttle body.
  2.  
  3. Connect the injector electrical harness.
  4.  
  5. Install the injector cap using a new gasket.
  6.  
  7. Install the air intake boot.
  8.  
  9. Connect the negative battery cable.
  10.  
  11. Start the vehicle and check for leaks.
  12.  

TESTING



See Figures 2 and 3

Click image to see an enlarged view

Fig. Fig. 2: Schematic of an SPFI system injector



Click image to see an enlarged view

Fig. Fig. 3: Measure resistance between the injector terminals

  1. Using a stethoscope, ensure that a clicking sound is heard at the injector (when idling or cranking the engine). If a clicking noise is not heard, proceed as follows:
    1. Turn the ignition switch to the OFF position, then disconnect the control unit connector.
    2.  
    3. Using an ohmmeter, measure resistance between terminal 43 (RW) and terminal 48 (RB) on the harness connector. The ohmmeter should read 0.5-2 ohms.
    4.  

  2.  
  3. Check the injector for discontinuity as follows:
    1. Disconnect the electrical connector from the injector.
    2.  
    3. Using an ohmmeter, measure the resistance between the terminals of the connector. The ohmmeter should read 0.5-2 ohms.
    4.  
    5. If the readings are not as specified, replace the injector.
    6.  

  4.  
  5. Check the injector for insulation as follows:
    1. Using an ohmmeter, measure resistance between each terminal of the connector on the injector side and ground. The ohmmeter should read 1 mega-ohm.
    2.  
    3. If the readings are not as specified, replace the injector.
    4.  

  6.  
  7. If specifications obtained in Step 1 are not as specified, but those obtained in Steps 2 and 3 are within specifications, check the harness for discontinuity and the connector for poor connection.
  8.  

 
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