Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Honda >> 1994 >> Prelude VTEC >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Relays & Solenoids >> Relays >> Main Relay (PGM-FI)

Main Relay (PGM-FI)

  1. If vehicle starts and continues to run, relay is okay. To test, remove main relay, located under left side of dash. Using jumper wires, connect terminal No. 6 to battery voltage. Connect terminal No. 8 to ground. See Fig 1 .
  2. Check for continuity between relay terminals No. 5 and 7. Continuity should exist. If continuity does not exist, replace relay. Disconnect battery leads. Repeat measurement. If continuity does not exist, go to next step. If continuity exists, replace relay.
  3. Connect battery voltage to relay terminal No. 5. Connect terminal No. 2 to ground. Check for continuity between terminals No. 1 and 3. Continuity should exist. Disconnect battery leads. Repeat measurement. Continuity should not exist. If continuity exists, replace relay.
  4. Connect battery voltage to relay terminal No. 3. Connect terminal No. 8 to ground. Check for continuity between terminals No. 5 and 7. Disconnect battery leads. Repeat measurement. If continuity does not exist, relay is okay. If continuity exists, replace relay. If fuel pump still fails to operate, test main relay harness. See MAIN RELAY HARNESS under FUEL CONTROL  under FUEL SYSTEM.
    Fig 1: Identifying PGM-FI Relay Terminals
    G90C17147Courtesy of AMERICAN HONDA MOTOR CO., INC.
scientia non olet · About Mike's Workshop Manuals