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Main Relay (Computer/Fuel System): Testing and Inspection

NOTE: If the car starts and continues to run, the PGM-FI main relay is OK.


Component Test
1. Remove the PGM-FI main relay.




2. Attach the battery positive terminal to the No. 2 terminal and the battery negative terminal to the No. 1 terminal of the PGM-FI main relay. Then check for continuity between the No. 5 terminal and No. 4 terminal of the PGM-FI main relay.
- If there is continuity, go on to step 3.
- If there is no continuity, replace the PGM-FI main relay and retest.

3. Attach the battery positive terminal to the No. 5 terminal and the battery negative terminal to the No. 3 terminal of the PGM-FI main relay. Then check that there is continuity between the No. 7 terminal and No. 6 terminal of the PGM-FI main relay.
- If there is continuity, go on to step 4.
- If there is no continuity, replace the PGM-FI main relay and retest.

4. Attach the battery positive terminal to the No. 6 terminal and the battery negative terminal to the No. 1 terminal of the PGM-FI main relay. Then check that there is continuity between the No. 5 terminal and No. 4 terminal of the PGM-FI main relay.
- If there is continuity, the PGM-FI main relay is OK.
- If the fuel pump still does not work, go to Harness Testing.
- If there is no continuity, replace the PGM-FI main relay and retest.

Harness Testing







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