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 MANUALSTOYOTA2001HIGHLANDER 2WD L4-2.4L (2AZ-FE)REPAIR AND DIAGNOSISRELAYS AND MODULESRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSOXYGEN SENSOR RELAYTESTING AND INSPECTION
2001 Toyota Highlander 2WD L4-2.4L (2AZ-FE)
Oxygen Sensor Relay: Testing and Inspection
2001 Toyota Highlander 2WD L4-2.4L (2AZ-FE)SECTION Testing and Inspection
E.F.I. CIRCUIT OPENING RELAY ASSY [85910A / 98-168]
E.F.I ECU RELAY [85910F / 98-168]
AIR FUEL RATIO SENSOR HEATER RELAY [85915S / 98-168]
Continuity inspection.
Using an ohmmeter, check that continuity exists between each terminal.
Specified condition:
Between terminal 1 and 2 Continuity
Between terminal 3 and 5 No continuity
Using an ohmmeter, check that continuity exists between terminals 3 and 5 when the battery voltage is applied across terminals 1 and 2.
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.