Emission Control Lexus LS III facelift

Scheme 1

Scheme 2

Scheme 3

Scheme 4

Scheme 5

Scheme 6

Scheme 7

Scheme 8

Scheme 9

Scheme 10

Scheme 11

Scheme 12

Scheme 13

Scheme 14

Scheme 15

Scheme 16

Scheme 17

Scheme 18

Scheme 19

1. INSPECT A/F COMPENSATION SYSTEM HINT: This system can also be checked using the hand-held tester. Switch to DATA MONITOR mode and select O2 SENSOR OUTPUT VOLTAGE. Connect the hand-held tester to terminals E6-30 (OX1A) and E6-25 (O1A-) of the ECM. Connect the hand-held tester to terminals E5-28 (OX2A) and E5-21 (O2A-) of the ECM. NOTE: Connect test leads to the connector's backside. The connectors should not be disconnected from the ECM. Warm up the heated oxygen sensor with the engine speed at 2,500 RPM for approximately 2 minutes. 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 in 10 seconds. NOTE: Check the voltage immediately after warming up the heated oxygen sensor. If change of voltage could not be confirmed, warm up the heated oxygen sensor again.
2. INSPECT FUEL CUT OFF RPM Increase the engine speed to at least 3,000 RPM. Use a sound scope to check the injector operation noise. OK: When the throttle lever is released, the injector operation noise stops momentarily but start again soon after.
3. INSPECT EVAPORATIVE EMISSION CONTROL SYSTEM Start the engine. Disconnect the vacuum hose as shown in the illustration. From the hand-held tester ACTIVE TEST mode, select PURGE VSV. Check that a vacuum occurs at the VSV port. Exit ACTIVE TEST mode and reconnected the vacuum hose. From the hand-held tester ECU DATA MONITOR mode, select PURGE VSV. Check operation of the purge VSV. Warm up the engine and drive the vehicle. Confirm that the purge VSV is turned from OFF to ON.
4. INSPECT EVAP SYSTEM LINE Warm up the engine to the normal operating temperature and stop the engine. Install a vacuum gauge (EVAP control system test equipment) to the EVAP service port on the purge line. Perform forced driving of the VSV for EVAP. Connect the hand-held tester to the DLC3 (with CAN VIM). Start the engine. Push the hand-held tester main switch ON. Use the hand-held tester ACTIVE TEST mode to operate the VSV for EVAP. Check the vacuum at idle. Vacuum: Maintains 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 which connects the VSV to the service port is loose or is blocked, or the VSV is malfunctioning. Finish forced driving of the VSV for EVAP. Stop the engine. Disconnect the hand-held tester (with CAN VIM) from the DLC3. Disconnect the vacuum gauge from the EVAP service port on the purge line. Connect a pressure gauge to the EVAP service port on the purge line. Check the pressure. Close the air drain hose at the marked position with a hose clipper or similar tool. Apply pressure (13.5 to 15.5 in Aq) from the EVAP service port. Pressure: In 2 minutes after pressure is applied, the gauge should indicate over 7.7 to 8.8 in.Aq. HINT: If pressure could not be applied, the hose which connects the VSV, charcoal canister and fuel tank is disconnected, or the VSV is open. 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. Disconnect the pressure gauge from the EVAP service port on the purge line.
5. CHECK AIRTIGHTNESS IN FUEL TANK AND FILLER PIPE Disconnect the EVAP line hose from the charcoal canister. Pinch portion A. Pull out the connector. Allow the internal pressure in the fuel tank to be 4 kPa (41 gf/cm 2 , 0.58 psi). Check that the internal pressure of the fuel tank remains the same for 1 minute. Check the connected portions of each hose and pipe. Check the installed parts on the fuel tank. If there is abnormality, replace the fuel tank and filler pipe. Reconnect the EVAP line hose to the charcoal canister.
6. INSPECT FUEL CUT OFF VALVE AND FILL CHECK VALVE Disconnect the purge line hose and EVAP line hose from the charcoal canister. Plug the air drain hose with the cap. Apply 4 kPa (41 gf/cm 2 , 0.58 psi) of pressure to the purge port and check that there is ventilation in the EVAP line hose. 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. If air can flow freely from the purge port through to the EVAP line hose, the fuel cutoff valve and fill check valve are operating normally. Go to step (d). If air cannot flow freely from the purge port through to the EVAP line hose, disconnect the vent line hose and EVAP line hose and check if they are clogged or not. If clogged, replace. If the vent line hose and EVAP line hose are operating normally and air still cannot flow freely from the purge port through to the EVAP line hose, replace the fuel cutoff valve and fill check valve. Reconnect the purge line hose to the charcoal canister.
7. CHECK AIR INLET LINE Disconnect the air inlet line hose from the charcoal canister. Check that there is ventilation in the air inlet line hose. Reconnect the air inlet line hose to the charcoal canister.
8. VISUALLY INSPECT HOSES, CONNECTIONS AND GASKETS Check for cracks, leaks or damage. HINT: Possible leakage points are indicated in the illustration. Removal or 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 the engine trouble.
9. INSPECT HEATED OXYGEN SENSOR (HEATER RESISTANCE) Bank 1 sensor 1, bank 2 sensor 1: Disconnect the sensor connector. Measure the resistance between terminals 1 (HT) and 2 (+B). Standard: If the result is not as specified, replace the sensor. Bank 1 sensor 2, bank 2 sensor 2: Disconnect the sensor connector. Measure the resistance between terminals 1 (HT) and 2 (+B). Standard: If the result is not as specified, replace the sensor.

Scheme 20

Scheme 21

Scheme 22

Scheme 23

Scheme 24

Scheme 25

Scheme 26

Scheme 27

Scheme 28

Scheme 29

Scheme 30

Scheme 31

Scheme 32

Scheme 33

Scheme 34

Scheme 35

Scheme 36

Scheme 37

Scheme 38

Scheme 39

Scheme 40

Scheme 41

Scheme 42

Scheme 43

1. INSPECT CHARCOAL CANISTER ASSY Visually check the charcoal canister for cracks or damage. Inspect the charcoal canister operation. Plug the vent port with the cap. While holding the purge port closed, blow air (1.76 kPa, 18 gf/cm 2 , 0.26 psi) into the EVAP port to check that air flows from the air drain port. While holding the purge port and the air drain port closed, blow air (1.76 kPa, 18 gf/cm 2 , 0.26 psi) into the EVAP port to check that air does not flow from the air inlet port. Apply a vacuum (3.43 kPa, 25.7 mmHg, 1.01 in.Hg) to the purge port, check that the vacuum does not decrease when the air inlet port in closed, and check that the vacuum decreases when the air inlet port is released. If the result is not as specified, replace the charcoal canister assy. While holding the air inlet port closed, apply vacuum (3.43 kPa, 25.7 mmHg, 1.01 in.Hg) to the EVAP port and check that air flows into the purge port. If result is not as specified, replace the charcoal canister. Remove the cap from vent port.
2. INSPECT VACUUM SWITCHING VALVE ASSY FOR ACIS Measure the VSV resistance. If the result is not as specified, replace the VSV assy. Check VSV operation. Check that air does not flow from port E to port F. If the result is not as specified, replace the VSV assy. Apply battery positive voltage across the terminals. Check that air flows from port E to port F. If the result is not as specified, replace the VSV assy.
3. INSPECT VACUUM SWITCHING VALVE ASSY FOR PSV Measure the VSV for resistance. If the result is not as specified, replace the VSV assy. Check VSV operation. Check the air does not flow from port E to port F. Apply battery positive voltage across the terminals. Check that air flows from port E to port F. If the result is not as specified, replace the VSV assy.
4. INSPECT VENTILATION VALVE SUB-ASSY Install a clean hose to the PCV valve. Inspect PCV valve operation. Blow air from the cylinder head side of the engine, and check that air passes through easily. CAUTION: Do not suck air through the valve. Petroleum substances stuck to the valve is harmful. Blow air from the intake manifold side of the engine, and check that air passes through with difficulty. If the result is not as specified, replace the PCV valve. Remove the clean hose from the PCV valve.
5. INSPECT FUEL TANK CAP ASSY Visually check if cap and/or gasket are deformed or damaged. If necessary, repair or replace the cap.
6. INSPECT VACUUM SWITCHING VALVE ASSY FOR EVAP Measure the VSV resistance. If the result is not as specified, replace the VSV assy. Check VSV operation. Check that air does not flow from port E to port F. If the result is not as specified, replace the VSV assy. Apply battery positive voltage across the terminals. Check that air flow from port E to port F. If the result is not as specified, replace the VSV assy.
7. INSPECT VACUUM SWITCHING VALVE ASSY FOR CCV Measure the VSV for resistance. If the result is not as specified, replace the VSV assy. Check the VSV operation. Check that air does not flow from port A to port B. Apply battery positive voltage across the terminals. Check that air does not flow from port A to port B. If the result is not as specified, replace the VSV assy.

Scheme 44

1. REMOVE VENTILATION VALVE SUB-ASSY Disconnect the PCV hose from the PCV valve. Remove the PCV valve.
2. INSTALL VENTILATION VALVE SUB-ASSY Reinstall the PCV valve. Apply adhesive to 2 or 3 threads. Adhesive: Part No. 08833-00070, THREE BOND 1324 or equivalent Reinstall the PCV valve. Torque: 27 N.m (275 kgf.cm, 20 ft.lbf) Connect the PCV hose to the PCV valve.

Scheme 45

Scheme 46

1. DISCONNECT REAR DRIVE SHAFT RH (See «DRIVE SHAFT, PROPELLER SHAFT, AXLE»(/lexus/ls/iii-facelift-2003-2006/remont/driveshaft-universal-joints/#drive-shaft-propeller-shaft-axle) )
2. REMOVE CHARCOAL CANISTER ASSY Disconnect the VSV connector. Disconnect the vapor pressure sensor connector. Disconnect the purge line hose, EVAP line hose and air inlet line hose from the charcoal canister. Push the connect or deep inside. Pinch portion A. Pull out the connector. Remove the 3 bolts and the charcoal canister.
3. INSTALL CHARCOAL CANISTER ASSY Install the charcoal canister with the 3 bolts. Torque: 5.5 N.m (56 kgf.cm, 49 in.lbf) Connect the vent line hose to the charcoal canister. Connect the purge line hose, EVAP line hose and air inlet line hose to the charcoal canister. Connect the vapor pressure sensor connector. Connect the VSV connector.
4. CONNECT REAR DRIVE SHAFT RH (See «DRIVE SHAFT, PROPELLER SHAFT, AXLE»(/lexus/ls/iii-facelift-2003-2006/remont/driveshaft-universal-joints/#drive-shaft-propeller-shaft-axle) )

See also:
• DRIVE SHAFT, PROPELLER SHAFT, AXLE