Toyota Celica 1986-1993 Repair Guide

Main Relay

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Fig. Fig. fig49Testing the main relayCelica

TESTING



  1. When the ignition is switched On , the main relay should be heard to click.
  2.  
  3. To further test the relay, remove it from its mount by pulling outward.
  4.  
  5. Using an ohmmeter, test for continuity between terminals 1 and 3. The resistance should be 40-60 ohms.
  6.  
  7. There should be no continuity between terminals 2 and 4.
  8.  
  9. Apply battery voltage and ground to terminals 1 and 3.
  10.  
  11. With voltage applied, continuity should be present at terminals 2 and 4.
  12.  
  13. If any test condition is not met and the wiring and ecu system are functioning correctly, the relay must be replaced.
  14.  

 
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