On-Vehicle Inspection
1. INSPECT AIR-FUEL RATIO COMPENSATION SYSTEM
Standard Voltage:
a. Measure voltage between terminals of the engine ECM.
CAUTION: Connect test leads from the back side of the connector with the ECM connected.
HINT: Voltage between terminals of the engine ECM is kept constant regardless of the voltage of A/F sensor.
b. Connect the hand-held tester to the DLC3.
c. Select "DATA MONITOR" - "A/FS B1 S1", "A/FS B2 S1" and "O2S B1 S2" to display the monitor.
d. Warm up the A/F sensor with the engine speed at 2,500 rpm for approx. 2 minutes.
e. Keep the engine speed at 2,500 rpm and confirm that the displays of "A/FS B1 S1" and "A/FS B2 S1" are as shown in the illustration.
CAUTION:
- The illustration differs from the real display.
- Only hand-held tester displays the waveform of A/F sensor.
f. Confirm that the display of "O2S B1 S2" changes between 0 V to 1 V with the engine speed at 2,500 rpm.
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 noise.
c. Check that when the throttle lever is released, injector operation noise stops momentarily and then resumes.
3. INSPECT EVAPORATIVE EMISSION CONTROL SYSTEM
a. After starting the engine, disconnect the vacuum hose shown in the illustration.
b. Confirm vacuum occurs at the vsv port, when choosing "ACTIVE TEST" and "PURGE VSV" according to the display on hand-held tester.
c. Finish "ACTIVE TEST", then connect the vacuum hose again.
d. After going to "ECM DATA MONITOR" on the hand-held tester, choose "PURGE VSV" to check the operation of the purge VSV
e. After warm up the engine and drive the vehicle, confirm the VSV turns on from off.
4. INSPECT EVAP SYSTEM LINE
a. Warm up the engine and stop the engine. Allow the engine to warm up to normal operating temperature.
b. Install a vacuum gauge (EVAP control system test equipment vacuum gauge) to the EVAP service port on the purge line.
c. Hand-Held Tester:
Forced driving of the VSV for the EVAP.
1. Connect a hand-held tester to the DLC3
2. Start the engine.
3. Push the hand-held tester main switch ON.
4. Use the ACTIVE TEST mode on the hand-held tester to operate the VSV for the EVAP.
d. If you have no Hand-Held Tester:
Forced driving of the VSV for the EVAP.
1. Disconnect the VSV connector for the EVAP.
2. Connect the positive (+) and negative (-) leads from the battery to the VSV terminals for the EVAP.
3. Start the engine.
e. Check the vacuum at idle
Vacuum: Maintain at 0.368 - 19.713 in.Hg (5 - 268 in.Aq) for over 5 seconds.
HINT: If the vacuum does not change, you can conclude that the hose connecting the VSV to the service port has come loose or is blocked, or the VSV is malfunctioning.
f. Hand-Held Tester:
Conclude forced driving of the VSV for the EVAP.
1. Stop the engine.
2. Disconnect the hand-held tester from the DLC3.
g. If you have no Hand-Held tester:
Conclude forced driving of the VSV for the EVAP.
1. Stop the engine.
2. Disconnect the positive (+) and negative (-) leads from the battery from the VSV terminals for the EVAP.
3. Connect the VSV connector for the EVAP.
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 - 15.5 in.Aq) from the EVAP service port.
Pressure: 2 minutes after the pressure is added, the gauge should be over 7.7 - 8.8 in.Aq.
HINT: If you can not add pressure, you can conclude that 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 adding pressure.
HINT: If the pressure does not decrease when the filler cap is removed, then you can conclude that 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 AIR TIGHTNESS IN FUEL TANK AND FILLER PIPE
a. Disconnect the EVAP line hose from the charcoal canister side and then pressurize and make the internal pressure in the fuel tank 4 kPa (41 gf/sq.cm, 0.58 psi).
b. Check that the internal pressure of the fuel tank can hold for 1 minute.
c. Check the connected portions of each hose and pipe.
d. Check the installed parts on the fuel tank.
If there is no abnormality, replace the fuel tank and filler pipe.
e. 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 cap to the air drain hose.
c. Pressurize 4 kPa (41 gf/sq.cm, 0.58 psi) to 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 value of the fill check valve is closed and has no ventilation, it is necessary to check the fuel amount (volume).
d. Check if there is any struck in the vent line hose and EVAP line hose.
If there is no stuck in hoses, replace the fuel cut off 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 for cracks, leaks or damage.