LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Honda >> 1988 >> Civic Base, 2D Hatchback >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - PGM-FI System >> Testing >> Main Relay
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Main Relay

  1. Turn ignition off. Remove main relay (located under left side of instrument panel) and disconnect electrical connector. Connect battery voltage to No. 4 terminal of relay and ground to No. 8 terminal of relay. Check continuity between terminals No. 5 and 7. If there is no continuity, replace main relay.
  2. Connect battery voltage to No. 5 terminal of relay. Connect No. 2 terminal of relay to ground. Check continuity between terminals No. 1 and 3. If there is no continuity, replace main relay.
  3. Connect battery voltage to terminal No. 3 of relay. Connect terminal No. 8 of relay to ground. Check continuity between terminals No. 5 and 7 of relay. If there is no continuity, replace main relay. If main relay is okay, but fuel pump still does not operate, proceed to MAIN RELAY HARNESS TESTING. See Fig 1 .
Fig 1: Main Relay Terminal Identification
G93521Courtesy of AMERICAN HONDA MOTOR CO., INC.
scientia non olet · About LEMON Manuals