Evaporative Emission Control System: Diagnosis Hyundai Equus II

[System Inspection]

1. Disconnect the vapor hose from the throttle body and connect a vacuum pump to the nipple on the throttle body.
2. Check the following points with applying vacuum using the vacuum pump.

At Cold Engine [Engine Coolant Temperature < 60°C(140°F)]

ENGINE OPERATING CONDITION REFERENCE CHART

At Warmed Engine [Engine Coolant Temperature > 80°C(176°F)]

ENGINE OPERATING CONDITION REFERENCE CHART

Scheme 16

1. Turn ignition switch OFF and disconnect the negative (-) battery cable.
2. Disconnect the PCSV connector (A).
3. Disconnect the vapor hose (B) which is connected with the intake manifold from the PCSV.
4. After connecting a vacuum pump to the nipple, apply vacuum.
5. With the PCSV control line grounded, check valve operation when applying battery voltage to the PCSV or not. VOLTAGE REFERENCE CHART Battery Voltage Valve Vacuum Connected Open Released Disconnected Close Maintained
6. Measure the coil resistance of the PCSV. Specification: 14.0 ~ 18.0ohms [20°C(68°F)]

Scheme 17

Scheme 18

1. Select "Evap. Leakage Test".
2. Proceed with the test according to the screen introductions.

Scheme 19

1. Turn the ignition switch OFF and disconnect the negative (-) battery cable.
2. Remove the service cover (A).
3. Disconnect the fuel tank pressure sensor connector (A) and the canister close valve connector (B).
4. Disconnect the vapor tube quick-connector (C), the vapor hose quick-connector (D), and the vapor hose (E) from the canister.
5. Remove the fuel tank pressure sensor hose clip (F).
6. Remove the canister after removing the installation bolt (G).

Scheme 20

Inspection

1. Check for the following items visually.

1. Cracks or leakage of the canister
2. Loose connection, distortion, or damage of the vapor hose/tube

Scheme 21

A: Canister <--> Atmosphere (via Fuel Tank Air Filter)

B: Canister <--> Fuel Tank

C: Canister <--> Intake Manifold