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.
Air Fuel Ratio Sensor Relay: Inspection
- INSPECT AIR FUEL RATIO SENSOR RELAY
- Inspect A/F relay
- Using an ohmmeter, measure the resistance between the terminals.
Resistance
TESTER CONNECTIONS AND SPECIFIED CONDITIONSTester Connection Specified Condition 1F-1 - 1C-6 10 k or higher 1F-1 - 1C-6 Below 1
(Apply battery voltage to terminals 1D-5 and 1H-2)If the result is not as specified, replace the engine room junction block assembly.
- Using an ohmmeter, measure the resistance between the terminals.
- Inspect A/F relay
Use the Manual With the Right Hardware
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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.
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