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 MANUALSTOYOTA2007HIGHLANDER 2WD V6-3.3L (3MZ-FE)REPAIR AND DIAGNOSISRELAYS AND MODULESRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSMAIN RELAY (COMPUTER/FUEL SYSTEM)TESTING AND INSPECTIONEFI RELAY
2007 Toyota Highlander 2WD V6-3.3L (3MZ-FE)
EFI Relay
2007 Toyota Highlander 2WD V6-3.3L (3MZ-FE)SECTION EFI Relay
INSPECTION
INSPECT RELAY (Marking: EFI, A/F)
a. Remove the EFI relay from the engine room J/B.
b. Remove the A/F relay from the engine room R/B No. 2.
c. Measure the resistance of the relay.
If the result is not as specified, replace the relay.
INSPECT RELAY (Marking: EFI, A/F)
a. Remove the EFI relay from the engine room J/B.
b. Remove the A/F relay from the engine room R/B No. 2.
c. Measure the resistance of the relay.
If the result is not as specified, replace the 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.