On-Vehicle Inspection
ON-VEHICLE INSPECTION1. INSPECT AIR-FUEL RATIO COMPENSATION SYSTEM
a. Connect the hand-held tester to the DLC3.
b. Turn the ignition switch to ON.
c. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / O2S B1 S1 and O2S B1 S2.
d. Warm up the heated oxygen sensor with the engine speed at 2,500 rpm for approximately 2 minutes.
e. Confirm that the voltage output changes between 0 V and 1 V with the engine speed at 2,500 rpm.
OK:
The voltage output oscillates more than 8 times in 10 seconds.
CAUTION:
- Perform the check immediately after warming the engine up.
- If the voltage variation could not be verified, warm up the heated oxygen sensor again. If it could not be verified even after warming up the sensor again, check the DTC No.
2. INSPECT FUEL CUT OFF RPM
a. Increase the engine speed to at least 3,500 rpm.
b. Use a sound scope to check for injector operating sounds.
c. Check that injector operating sounds stops momentarily and then resumes when the throttle lever is released.
3. INSPECT EVAPORATIVE EMISSION CONTROL SYSTEM
a. Check the operation.
1. Connect the hand-held tester to the DLC3.
2. After starting the engine, disconnect the vacuum hose shown in the illustration.
3. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / EVAP VSV (ALONE).
4. Check that a vacuum occurs in the VSV port.
5. Finish Active Test, then connect the fuel vapor feed hose.
6. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DATA LIST / EVAP VSV.
7. After driving the vehicle with a warm engine, confirm that the VSV turns from OFF to ON.
4. INSPECT EVAP SYSTEM LINE
a. Warm up the engine and stop the engine. Warm up the engine to normal operating temperature.
b. Install a vacuum gauge (EVAP control system test equipment vacuum gauge) into the EVAP service port on the purge line.
c. When using a hand-held tester: Operation of VSV of EVAP using hand-held tester.
1. Connect the hand-held tester to the DLC3
2. Start the engine.
3. Turn the hand-held tester ON.
4. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / EVAP VSV (ALONE).
d. When not using a hand-held tester: Operation of VSV of EVAP not using hand-held tester.
1. Disconnect the VSV for EVAP connector.
2. Connect the positive (+) and negative (-) leads of the battery to the VSV for EVAP terminals.
3. Start the engine.
e. Check the vacuum when the engine idles.
Vacuum:
Maintain at 0.368 to 19.713 in.Hg (5 to 268 in.Aq) for over 5 seconds.
HINT: If the vacuum does not change, the hose connecting the VSV to the service port is loose or blocked, or the VSV is malfunctioning.
f. When using a hand-held tester: Conclude operation of VSV of EVAP using hand-held tester.
1. Stop the engine.
2. Disconnect the hand-held tester from the DLC3.
g. When not using a hand-held tester:
Conclude operation of VSV of EVAP not using hand-held tester.
1. Stop the engine.
2. Disconnect the positive (+) and negative (-) leads of the battery from the VSV for EVAP terminals.
3. Connect the VSV for EVAP 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. Close off the air drain hose at the marked position of the canister with a hose clipper or similar instrument.
2. Add the pressure (13.5 to 15.5 in.Aq) from the EVAP service port.
Pressure:
The gauge should still read over 7.7 to 8.8 in.Aq for 2 minutes after the pressure is applied.
HINT: If pressure can not be applied, the hose connecting the VSV-canister-fuel tank has slipped off or the VSV is open.
3. Check if the pressure decreases when the fuel tank cap is removed while applying pressure.
HINT: If the pressure dose not decrease when the filler cap is removed, the hose connecting the service port to the fuel tank is blocked, etc.
k. Disconnect the pressure gauge from the EVAP service port on the purge line.
5. CHECK AIRTIGHTNESS IN FUEL TANK AND FILLER PIPE
a. Disconnect the EVAP line hose from the charcoal canister.
1. Pinch portion A.
2. Pull the connector out.
b. Apply pressurized air 4 kPa (41 gf/cm2, 0.58 psi) into the fuel tank.
c. Check that the internal pressure of the fuel tank can be hold for 1 minute.
d. Check the connected portions of each hose and pipe.
e. Check the installed parts on the fuel tank.
If there is no abnormality, replace the fuel tank and filler pipe.
f. Reconnect the EVAP line hose to the charcoal canister.
6. INSPECT FUEL CUT OFF VALVE AND FILL CHECK VALVE
a. Disconnect the purge line hose and EVAP line hose from the charcoal canister.
b. Plug the air inlet hose with the cap.
c. Apply pressurized air 4 kPa (41 gf/cm2, 0.58 psi) into the purge port and check that there is ventilation through the EVAP line hose.
HINT: In the condition that the fuel is full, as the float valve of the fill check valve is closed and there is no ventilation, it is necessary to check the fuel amount (volume).
d. Check if there is anything stuck in the vent line hose and EVAP line hose.
If there is anything stuck in them, replace the fuel cutoff valve and fill check valve.
e. Reconnect the purge line hose and EVAP line hose to the charcoal canister.
7. CHECK AIR INLET LINE
a. Disconnect the air inlet line hose from the charcoal canister.
b. Check that there is ventilation in the air inlet line.
c. Reconnect the air inlet line hose to the charcoal canister.
8. VISUALLY INSPECT HOSES, CONNECTIONS AND GASKETS
a. Check the appearance.
1. Check if the indicated portions of the engine assembly are cracked, leaking or damaged.
HINT: Disconnection of the engine oil level gage, oil filler cap, PCV hose, etc. 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 the engine to run improperly.
If necessary, repair the engine assembly.