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.
Flag 16: Electrical Variable Orifice (EVO) Fault
EVO valve is controlled and monitored by PCM. When vehicle speed is zero MPH, current from PCM will be zero milliamps. Once vehicle speed reaches 12 MPH, current will gradually increase from 120 milliamps to 650 milliamps as vehicle speed increases from 12 to 55 MPH.
Flag 16 may set due to loss of ignition while vehicle is moving. When monitoring EVO output and feedback on a "Scan" tester, readings will have an inverse ratio. When output is 100 percent, feedback will be zero percent. Feedback should increase with increase in vehicle speed. If output decreases and feedback increases proportionally, EVO subsystem is okay. Ensure resistance across EVO terminals is8-12 ohms, with no continuity to ground.
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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.