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.
Vapor test
- Move the vehicle to a location where safety can be assured.
- Ignition switched ON (engine off).
- Access the following PIDs using the M-MDS. (See PCM INSPECTION
.)
- EVAPCP
- EVAPCV
- Press the [VAPOR TEST] button in the center of the tester and verify that the red lamp turns on.
- Turn the EVAP/low pressure flow control valve for the EVAP/low pressure testing (right side of tester) to ON.NOTE:
- The vapor flow can be adjusted between the minimum and maximum levels.
- The value indicated by the flow meter indicates the flow rate of the vapor supplied to the EVAP system.
- The value indicated by the system pressure gauge indicates the internal pressure of the EVAP system.
- Set the value for simulation item EVACP to 50% duty cycle.
- Remove the evaporative hose inside the engine compartment. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION .)
- Verify that vapor comes out from the evaporative hose.
- Set the CV solenoid valve (simulation item: EVAPCV) to ON using the M-MDS.
- Set the value for simulation item EVACP to 0% duty cycle.
- Leave for 2 min with the EVAP/low pressure flow control valve ON.
- Monitor the indication of the flow meter for the EVAP/low pressure testing (right side of tester).
Flow meter value decreases to the minimum flow rate
- The EVAP system is normal in the passage between the fuel-filler cap installation surface and the purge solenoid valve, or between the charcoal canister and the CV solenoid valve.
- Perform inspections of the following part because malfunctions can be considered with them.
- Fuel-filler cap (See FUEL-FILLER CAP INSPECTION .)
Flow meter value does not decrease to the minimum flow rate
- The EVAP system has a malfunction between the fuel-filler cap and the purge solenoid valve, or between the charcoal canister and the CV solenoid valve.
- Proceed to the next step.
- The EVAP system is normal in the passage between the fuel-filler cap installation surface and the purge solenoid valve, or between the charcoal canister and the CV solenoid valve.
- Verify that vapor is leaking from the evaporative hose.
Vapor is leaking
- A malfunction can be considered with the purge solenoid valve. Perform the purge solenoid valve inspection. (See PURGE SOLENOID VALVE INSPECTION .)
Vapor is not leaking
- Verify if vapor is leaking from between the fuel-filler cap and the purge solenoid valve using the halogen inspection light.
- If vapor is leaking, replace the malfunctioning part, and perform the Air only test again. (See AIR ONLY TEST .)
Use the Manual With the Right Hardware
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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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