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.
Mode 4 (EVAP Verification)
Connect scan tool. Ensure BARO is 21.3 in. Hg. or more, IAT PID is 50-140°F (10-60°C) and FTL V PID is 0.5-2.5 volts. Ensure ECT PID is 14-72°F. If BARO PID is more, upper limit for ECT is more (BARO PID of 25.1 in. Hg. equals 90°F ECT limit). Turn all accessories off. Start engine. Raise engine speed to 3500 RPM for 200 seconds. Release throttle and allow to idle. Drive vehicle immediately. Accelerate from idle to 40-60 MPH within 20 seconds. Ensure 40-60 MPH is reached within 4 minutes of initial start. Drive vehicle steadily at 40-60 MPH for at least 2 minutes. Stop vehicle and allow to idle. Using scan tool, check drive mode completion status. If test is not complete, turn ignition off and repeat test. If test is complete, check test results. If results are okay, ensure no DTCs are present. If results are not okay, repairs are not complete.
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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.