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.
Inspection For VIS Control Circuit
- Turn IGN switch ON.
- Disconnect VIS connector.
- Check the VIS control terminal reference voltage value using a multi-tester.
- If the reference voltage is faulty, check the wiring harness.
List of Inspection Normal value Inspection Condition Probe (+) Probe (-) VIS control Approx. 2.5V - IGN Switch "ON"
- Disconnect the VIS connector
VIS connector side
2. ControlChassis Ground Information
The failure part according to the inspection of the VIS control line can be predicted as follows:
Measurement Result Possible Cause When voltage is not output Requires checking open in the wiring harness/PCM At about 12V output Short to power At about 0V output Short to the wiring harness/ground (chassis) OK
It can be a temporary fault due to poor contact of the circuit system.
Recheck connectors for looseness, poor contact, bending, corrosion, contamination, deformation or damage.
Go to "Replacing The VIS" procedure.
NG
Go to "Inspection For VIS short-circuit" procedure.
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.