On-Vehicle Inspection
ON-VEHICLE INSPECTION1. VISUALLY CHECK HOSES, CONNECTORS, AND GASKETS
a. Check that there are no cracks, leaks or damage.
NOTE:
- Detachment or other problems with the engine oil dipstick, filler cap, PCV hose and other components may cause the engine to run improperly.
- Disconnection, looseness or cracks in the parts of the air induction system between the throttle body and cylinder head will allow air suction and cause an engine failure or engine malfunctions.
If the result is not as specified, replace parts as necessary.
2. CHECK FUEL CUT RPM
a. Start and warm up the engine.
b. Open the throttle valve and keep the engine speed at 3,000 rpm.
c. Use a sound scope to check for injector operating noise.
d. Check that when the accelerator pedal is released, injector operation noise stops momentarily and then resumes.
If the result is not specified, check the injectors, wiring and ECM.
3. CHECK LINE AND CONNECTORS
a. Visually check for loose connections, sharp bends or damage.
4. CHECK FUEL TANK ASSEMBLY
a. Visually check for deformation, cracks or fuel leakage.
5. CHECK EVAP SYSTEM LINE
a. Warm up the engine to normal operating temperature and stop the engine.
b. Install a vacuum gauge (EVAP control system test equipment vacuum gauge) into the EVAP service port on the purge line.
c. When using the intelligent tester: Operation of the EVAP VSV.
1. Connect the intelligent tester to the Controller Area Network Vehicle Interface Module (CAN VIM). Then connect the CAN VIM to the Data Link Connector 3 (DLC3).
2. Start the engine.
3. Turn the intelligent tester main switch ON.
4. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / EVAP VSV (ALONE).
d. When not using the intelligent tester: Operation of the EVAP VSV.
1. Disconnect the EVAP VSV connector.
2. Connect leads from the positive (+) and negative (-) battery terminals to the EVAP VSV terminals.
3. Start the engine.
e. Check the vacuum when the engine idles.
Vacuum: Maintain between 0.368 and 019.713 in.Hg (5 to 268 in.Aq) for over 5 seconds.
HINT: If the vacuum does not change, the hose connecting the VSV and the service port is loose or blocked, or the VSV is malfunctioning.
f. When using the intelligent tester: Conclude operation of the EVAP VSV.
1. Stop the engine.
2. Disconnect the intelligent tester from the DLC 3.
g. When not using the intelligent tester: Conclude operation of the EVAP VSV.
1. Stop the engine.
2. Disconnect the positive (+) and negative (-) leads of the battery from the EVAP VSV terminals.
3. Connect the EVAP VSV connector.
h. Disconnect the vacuum gauge from the EVAP service port on the purge line.
i. Connect a pressure gauge to the EVAP service port on the purge line.
j. Check the pressure.
1. Prepare a rubber hose that has an inside diameter of 15 to 18.5 mm (0.59 in. to 0.73 in.).
2. Disconnect the atmospheric side hose of the pump module.
3. Connect the prepared rubber hose to the pump module, and pinch the rubber hose with the clip to prevent air from entering into the canister passage.
4. Apply pressure (13.5 to 15.5 in.Aq, 0.99 to 1.14 in.Hg) from the EVAP service port.
Pressure: The gauge should still read over 7.7 to 8.8 in.Aq (0.57 to 0.65 in.Hg) for 2 minutes after the pressure is applied.
HINT: If you cannot apply pressure, the hose connecting the VSV, charcoal canister and fuel tank cap is loose or the VSV is open.
5. Check that the pressure drops when the fuel tank cap is removed while applying pressure.
HINT: If the pressure does not drop when the fuel tank cap is removed, the hose connecting the service port and the fuel tank may be blocked.
k. Disconnect the pressure gauge from the EVAP service port on the purge line.
6. CHECK FUEL CUTOFF VALVE AND FILL CHECK VALVE
a. Disconnect the vent line hose from the fuel tank.
b. Connect the pressure gauge to the fuel tank.
c. Fill the fuel tank with fuel.
d. Apply pressure of 4 kPa (41 kgf/sq.cm, 0.58 psi) to the vent port of the fuel tank.
HINT: It is necessary to check the amount of fuel in the fuel tank. When the fuel tank is full, the float valve of the fill check valve is closed and no air can pass through.
e. Remove the fuel tank cap, and check that the pressure drops.
HINT: If the pressure does not drop, replace the fuel tank assembly.
f. Reconnect the vent line hose to the fuel tank.
7. CHECK AIR INLET LINE
a. Disconnect the air inlet line hose from the charcoal canister.
b. Check that air flows freely into the air inlet line.
HINT: If air does not flow freely into the air inlet line, repair or replace it.
c. Reconnect the air inlet line hose to the charcoal canister.