Emission Control System: Other Hyundai Sonata V

CHECK OF CANISTER CLOSE VALVE OPERATING

1. Connect the CCV pins to a wire as shown.
2. At idle, disconnect the CCV connector.
3. Inspect that CCV is close when attaching the wire to (-) of battery.
4. Inspect that CCV is open when detaching the wire from (-) of battery.

Scheme 25

Note. In this case, if you use a very thin paper and attach it to hose to CCV, you can check easy the CCV condition.

1. If the paper is absorbed into or out, CCV is open.
2. If not, CCV is close.

TWO-WAY VALVE

1. Inspect that air flows as shown.
2. Check to connect correctly such as the arrow mark on the valve.

Scheme 26

AIR FILTER

Look for distortion, cracks.

Scheme 27

EVAP CANISTER PURGE SOLENOID VALVE

Note. The EVAP Canister Purge Solenoid Valve is controlled by the ECM; when the engine coolant temperature is low, and also during idling, the valve closes so that evaporated fuel is not drawn into the surge tank. After engine warm-up during ordinary driving, it opens to let the stored vapors flow into the surge tank.

Scheme 28

When disconnecting the vacuum hose, make an identification mark on it so that it can be reconnected to its original position.

Scheme 29

Scheme 30

Scheme 31

1. Disconnect the vacuum hose (black with red stripe) from the solenoid valve.
2. Detach the harness connector.
3. Connect a vacuum pump to the nipple to which the red-striped vacuum hose was connected.
4. Apply vacuum and check when voltage is applied to the EVAP Canister Purge Solenoid Valve and when the voltage is discontinued.
5. Measure the current between the terminals of the solenoid valve.

EVAP Canister Purge Solenoid Valve

Coil at 20°C (68°F) : 0.45A or below (at 12V)

Coil resistance : 26ohms [at 20°C (68°F)]

Scheme 32

VACUUM HOSE

Engine coolant temperature : 80~95°C (176~205°F)

Scheme 33

1. Disconnect the vacuum hose from the intake manifold purge hose nipple and connect a hand vacuum pump to the nipple.
2. Start the engine and check that, after raising the engine speed by racing the engine, vacuum remains fairly constant.

Note. If there is no vacuum created the intake manifold port may be clogged and require cleaning.

Scheme 34

OVERFILL LIMITER (TWO WAY VALVE)

To inspect the overfill limiter (two-way valve).

Scheme 35

AIR/FUEL MIXTURE RATIO CONTROL SYSTEM [MULTIPORT FUEL INJECTION (MFI) SYSTEM]

The MFI system employs the signals from the heated oxygen sensor to activate and control the injector installed in the manifold for each cylinder, precisely regulating the air/fuel mixture ratio and reducing emissions.

This allows the engine to produce exhaust gases of the proper composition to permit the use of a three-way catalyst. The three-way catalyst is designed to convert the three pollutants (1) hydrocarbons (HC), (2) carbon monoxide (CO), and (3) oxides of nitrogen (NOx) into harmless substances. The two operating modes in the MFI system are as follows

1. Open loop-air/fuel ratio is controlled by information programmed into the PCM during the manufacturing process.
2. Closed loop-air/fuel ratio varies by the PCM based on information supplied by the heated oxygen sensor.