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.
Circuit Opening Relay: Inspection
- INSPECT EFI. CIRCUIT OPENING RELAY ASSEMBLY
- Inspect the resistance.
- Using an ohmmeter, measure the resistance between the terminals.
Resistance
RESISTANCE SPECIFICATIONSTester Connection Specified Condition 3-5 10 kΩ or higher 3-5 Below 1 Ω (Apply battery voltage to terminal 1 and 2) Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
If the result is not as specified, replace the EFI, circuit opening relay assembly.
- Using an ohmmeter, measure the resistance between the terminals.
- Inspect the resistance.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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