On-Vehicle Inspection

EMISSION CONTROL SYSTEM

ON-VEHICLE INSPECTION
1. INSPECT AIR-FUEL RATIO COMPENSATION SYSTEM

HINT You can also check the system by choosing the (O)2 SENSOR OUTPUT VOLTAGE from the DATA MONITOR mode according to the display of the LEXUS hand-held tester.




a. Connect the LEXUS hand-held tester to terminal OXL1-E1 of the ECU.
b. Connect the LEXUS hand-held tester to terminal OXR2-E1 of the ECU.

NOTE: Connect test leads from the back side of the connector with the ECU connected.

c. Warm up the oxygen sensor with the engine speed at 2,500 rpm for approx. 2 minutes.
d. Check that the voltage changes between 0 V and 1 V with the engine speed at 2,500 rpm.

OK: The voltage has changed more than 8 times for 10 seconds.

NOTE:
- Check the voltage immediately after warming up the oxygen sensor.
- If change of voltage could not be confirmed, warm up the oxygen sensor again.

2. INSPECT FUEL CUT OFF RPM
a. Increase the engine speed to at least 3,000 rpm.
b. Use a sound scope to check the injector operation noise.

OK: When the throttle lever is released, the injector operation noise stops momentarily but the noise reoccurs soon.




3. INSPECT EVAPORATIVE EMISSION CONTROL SYSTEM
a. Start the engine and disconnect the vacuum hose as shown in the illustration.
b. Choose the PURGE VSV from the ACTIVE TEST mode of the LEXUS hand-held tester to check that vacuum occurs at the VSV port.
c. Finish the ACTIVE TEST mode and connect the vacuum hose again.
d. Choose the PURGE VSV from the ECU DATA MONITOR mode of the LEXUS hand-held tester to check the operation of the purge VSV.
e. Warm up the engine and drive the vehicle. Then confirm that the purge VSV is turned to on from off.




4. INSPECT EVAP SYSTEM LINE
a. Warm up the engine to the normal operating temperature and stop the engine.
b. Install a vacuum gauge (EVAP control system test equipment) to the EVAP service port on the purge line.
c. LEXUS Hand-Held Tester:

Perform the forced driving of the VSV for the EVAP
1. Connect the LEXUS hand-held tester to the DLC3
2. Start the engine.
3. Push the LEXUS hand-held tester main switch ON.
4. Use the ACTIVE TEST mode of the LEXUS hand-held tester to operate the VSV for the EVAP




d. If you have no LEXUS Hand-Held Tester:

Perform the forced driving of the VSV for the EVAP
1. Disconnect the connector of the VSV for the EVAP
2. Connect the positive (+) and negative (-) leads from the battery to the terminals of the VSV for the EVAP
3. Start the engine.




e. Check the vacuum at idle.

Vacuum: Maintains at 0.368 - 19.713 in.Hg (5 - 268 in.Aq) for over 5 seconds.

HINT: If the vacuum does not change, the hose which connects the VSV to the service port is loose or is blocked, or the VSV is malfunctioning.

f. LEXUS Hand-Held Tester:

Finish the forced driving of the VSV for the EVAP
1. Stop the engine.
2. Disconnect the LEXUS hand-held tester from the DLC3.

g. If you have no LEXUS Hand-Held tester:

Finish the forced driving of the VSV for the EVAP
1. Stop the engine.
2. Disconnect the positive (+) and negative (-) leads from the battery and the terminals of the VSV for the EVAP
3. Connect the connector of the VSV 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 the air drain hose at the marked position with a hose clipper or similar tool.




2. Apply pressure (13.5 - 15.5 in. Aq) from the EVAP service port.

Pressure: In 2 minutes after pressure is applied, the gauge should indicate over 7.7 - 8.8 in.Aq.

HINT: If pressure could not be applied, the hose which connects VSV-Canister-fuel tank is disconnected, or the VSV is open.




3. Remove the fuel tank cap while pressure is being applied, and check that the pressure decreases.

HINT: If the pressure does not decrease when the fuel tank cap is removed, then the hose which connects 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 out the connector.

b. Allow the internal pressure in the fuel tank to be 4 kPa (41 gf/sq.cm, 0.58 psi).
c. Check that the internal pressure of the fuel tank remains the same 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 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 cap to the air drain hose.
c. Apply 4 kPa (41 gf/sq.cm, 0.58 psi) of pressure to the purge port and check that there is ventilation in 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 has no ventilation, it is necessary to check the fuel amount (volume).

d. Check if there is anything stuck in the purge line hose and EVAP line hose.
If there is nothing 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 hose.
c. Reconnect the air inlet line hose to the charcoal canister.




8. VISUALLY INSPECT HOSES, CONNECTIONS AND GASKETS
Check for cracks, leaks or damage.

HINT: Separation of the engine oil dipstick, oil filler cap, PCV hose, etc. may cause the engine trouble. 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 trouble.




9. INSPECT HEATER RESISTANCE OF HEATED OXYGEN SENSOR
a. Bank 1,2 sensor 1:
Disconnect the oxygen sensor connector.

b. Using an ohmmeter, measure the resistance between terminals HT and +B.

Resistance: 11 - 16 Ohm at 20 °C (68 °F)




c. Bank 1, 2 sensor 2:
Disconnect the oxygen sensor connector.

d. Using an ohmmeter, measure the resistance between terminals HT and +B.

Resistance: 11 - 16 Ohm at 20 °C (68 °F)