Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSHONDA1993ACCORD L4-2156CC 2.2L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSMAIN RELAY (COMPUTER/FUEL SYSTEM)TESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICS
1993 Honda Accord L4-2156cc 2.2L SOHC
Component Tests and General Diagnostics
1993 Honda Accord L4-2156cc 2.2L SOHCSECTION Component Tests and General Diagnostics
NOTE: If the car starts and continues to run, the PGM-FI main relay is OK.
1. Remove the cruise control unit.
2. Remove the PGM-FI main relay.
3. Attach the battery positive terminal to the No. 6 terminal and the battery negative terminal to the No. 8 terminal of the PGM-FI main relay. Then check for continuity between the No. 5 terminal and No. 7 terminal of the PGM-FI main relay.
^ If there is continuity, go on to step 4.
^ If there is no continuity, replace the relay and retest.
4. Attach the battery positive terminal to the No. 5 terminal and the battery negative terminal to the No. 2 terminal of the PGM-FI main relay. Then check that there is continuity between the No. 1 terminal and No. 3 terminal of the PGM-FI main relay.
^ If there is continuity, go on to step 5.
^ If there is no continuity, replace the relay and retest.
5. Attach the battery positive terminal to the No. 3 terminal and the battery negative terminal to the No. 8 terminal of the PGM-FI main relay. Then check that there is continuity between the No. 5 terminal and No. 7 terminal of the PGM-FI main relay.
^ If there is continuity, the relay is OK.
^ If there is no continuity, replace the relay and retest.
1. Remove the cruise control unit.
2. Remove the PGM-FI main relay.
PGM-FI Main Relay Test:
3. Attach the battery positive terminal to the No. 6 terminal and the battery negative terminal to the No. 8 terminal of the PGM-FI main relay. Then check for continuity between the No. 5 terminal and No. 7 terminal of the PGM-FI main relay.
^ If there is continuity, go on to step 4.
^ If there is no continuity, replace the relay and retest.
4. Attach the battery positive terminal to the No. 5 terminal and the battery negative terminal to the No. 2 terminal of the PGM-FI main relay. Then check that there is continuity between the No. 1 terminal and No. 3 terminal of the PGM-FI main relay.
^ If there is continuity, go on to step 5.
^ If there is no continuity, replace the relay and retest.
5. Attach the battery positive terminal to the No. 3 terminal and the battery negative terminal to the No. 8 terminal of the PGM-FI main relay. Then check that there is continuity between the No. 5 terminal and No. 7 terminal of the PGM-FI main relay.
^ If there is continuity, the relay is OK.
^ If there is no continuity, replace the relay and retest.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.