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.
DTC Parameters
- EVAP vent solenoid is commanded on (closed).
- EVAP purge solenoid is commanded off (closed).
- Engine is running.
- Fuel level is 15-85 percent.
- BARO more than 75 kPa.
- ECT and IAT are 39-86°F (4-30°C) at engine start-up.
- ECT and IAT are within 14°F (8°C) of each other.
- Throttle angle 7-35 percent.
- Vehicle speed less than 70 MPH.
- No ECT, fuel tank pressure, IAT, MAP, HO2S1, ECM internal fault, TP or VSS DTCs are set.
DTC sets when vacuum decay is more than 0.02-0.10 volts per second at fuel pressure sensor for more than 15 seconds. 0.02 volt is with a low fuel level and 0.10 volt is with a high fuel level. Condition must exist for more than 15 seconds.
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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.