EFI Main Relay: Inspection

2004 Toyota Matrix XR, FWD, StandardSECTION Inspection
WARNING: This page is about a different car, the 2004 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.
  1. REMOVE RELAY BOX COVER 
  2. REMOVE EFI MAIN RELAY 
    Fig 1: Removing Relay Box Cover & EFI Main Relay
    G02639454Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT EFI MAIN RELAY 
    1. Inspect the relay continuity.
      1. Using an ohmmeter, check that there is continuity between terminals 1 and 2.

        If there is no continuity, replace the relay.

      2. Check that there is no continuity between terminals 3 and 5.
      3. Fig 2: Checking Continuity Between Terminals 1 + 2 & No Continuity Between Terminals 3 + 5 Using Ohmmeter
        G02639455Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      If there is continuity, replace the relay.

    2. Inspect the relay operation.
      1. Apply battery positive voltage to terminals 1 and 2.
      2. Using an ohmmeter, check that there is continuity between terminals 3 and 5.
      3. Fig 3: Checking Continuity Between Terminals 3 + 5 Using Ohmmeter
        G02639456Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      If there is no continuity, replace the relay.

  4. REINSTALL EFI MAIN RELAY 
  5. REINSTALL RELAY BOX COVER 
RENDER: 1.0x

NO RELATED

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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.