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Honda Main Relays

Now that summer is upon us once again, there are a lot of Hondas that won't start after they get hot. This explains what happens and how to locate the problem.
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» Part 1: What's Up?
» Part 2: Basic Tests
» Part 3: Testing The Relay
 

Main Relay Test:

NOTE: If the car starts and continues to run, the main relay is okay.

  1. Remove the main relay.
  2. Attach the battery positive terminal to the No. 4 terminal and the battery negative terminal to the No. 8 terminal of the main relay. Then check for continuity between the No. 5 terminal and No. 7 terminal of the main relay.
    • If there is continuity, go on to step 3.
    • If there is no continuity, replace the relay and retest.
  1. Attach the battery positive terminal to the No. 5 terminal and the battery negative terminal to the No. 2 terminal of the main relay. Then check that there is continuity between the No. 1 terminal and No. 3 terminal of the main relay.
    • If there is continuity, go on to step 4.
    • If there is no continuity, replace the relay and retest.
  2. Attach the battery positive terminal to the No. 3 terminal and battery negative terminal to the No. 8 terminal of the main relay. Then check that there is continuity between the No. 5 terminal and No. 7 terminal of the main relay.
    • If there is continuity, the relay is OK; If the fuel pump still does not work, go to Harness Test.
    • If there is no continuity, replace the relay and retest.

 

Honda Main Relays

 

Honda Main Relays

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» Part 1       » Part 2       » Part 3
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