LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mitsubishi >> 2000 >> Eclipse GS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Diagnostic Procedures >> Ignition Checks >> MFI Relay
April 5, 2026: LEMON Manuals is launched! Read the announcement.

MFI Relay

MFI relay switches power to vehicle sensors and actuators including Volume Airflow (VAF) sensor, Crankshaft Position (CKP) sensor, Camshaft Position (CMP) sensor, Idle Air Control (IAC) motor and injectors. Relay failure will cause a no-start condition.

  1. Remove MFI relay. Check resistance between relay terminals No. 2 and 4. See Figure. Resistance should be about 70 ohms.
  2. Connect jumper wire between battery positive terminal and relay terminal No. 4. Connect second jumper wire between battery negative terminal and MFI relay terminal No. 2.
  3. With relay energized, continuity should exist between terminals No. 1 and 3. With power source removed, continuity should not exist between terminals No. 1 and 3. If relay does not test as specified, replace MFI relay.
scientia non olet · About LEMON Manuals