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 MANUALSTOYOTA19964 RUNNER 2WD L4-2.7L (3RZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSMAIN RELAY (COMPUTER/FUEL SYSTEM)TESTING AND INSPECTION
1996 Toyota 4 Runner 2WD L4-2.7L (3RZ-FE)
Main Relay (Computer/Fuel System): Testing and Inspection
1996 Toyota 4 Runner 2WD L4-2.7L (3RZ-FE)SECTION Testing and Inspection
1. REMOVE EFI MAIN RELAY (Marking: EFI)
2. INSPECT EFI MAIN RELAY
- Using an ohmmeter, check that there is continuity between terminals 1 and 2.
- If there is no continuity, replace the relay.
- Check that there is no continuity between terminals 3 and 4.
- If there is continuity, replace the relay.
- Apply battery positive voltage across terminals 1 and 2.
- Using an ohmmeter, check that there is continuity between terminals 3 and 4.
- If operation is not as specified, replace the relay.
3. REINSTALL EFI MAIN RELAY
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.