Toyota Celica, Corolla, ECHO & MR2 1999-05

Circuit Opening Relay

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Removal & Installation



The circuit opening relay is a attached to the ECM. Removal of the ECM may not be necessary, but refer to the ECM removal sequence to access the relay. Simply disconnect the wiring from the relay and unbolt the relay from the ECM.

Testing



  1. With the ignition switch OFF , remove the relay from its mount.
  2.  
  3. Using an ohmmeter, test for continuity between terminal STA and E1 . Continuity should be present.
  4.  



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Fig. Circuit opening relay wiring diagram



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Fig. Inspecting the circuit opening relay continuity

  1. There should be continuity between terminals B+ and FC .
  2.  
  3. There should be no continuity between terminals B+ and FP .
  4.  
  5. Apply battery voltage and ground to terminals STA and E1 ; with voltage applied, continuity should be present at terminals B+ and FP .
  6.  



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Fig. Inspecting circuit opening relay operation



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Fig. Place the terminal wiring in the correct locations when testing the relay

  1. Apply battery voltage and ground to terminals B and FC ; with voltage applied, continuity should be present at terminals B+ and FP .
  2.  
  3. If any test condition is not met, the relay must be replaced.
  4.  

 
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