Engine Controls - System & Component Testing - V6 & V8: Diagnosis Toyota Sienna I

Fuel EVAP System Test (Avalon, Camry & Camry Solara)

Note. Manufacturer provides testing information for testing airtightness of fuel tank and components along with testing of charcoal canister and fuel EVAP system.

Scheme 66

Scheme 67

Scheme 68

1. Inspect all lines and connections for sharp bends or damage. Fuel inlet pipe may also be referred to as fuel filler pipe. Inspect fuel inlet pipe for cracks, damage or fuel leakage. Inspect fuel tank cap for cracks or deformed gasket. Replace components if defective or damaged.
2. Start engine and warm engine to normal operating temperature. Shut engine off. Connect vacuum gauge from EVAP system test kit to EVAP service port. EVAP service port is located in engine compartment, in the purge vacuum hose for EVAP system. see scheme 118and see scheme 119.
3. EVAP Vacuum Switching Valve (VSV) must be operated. If scan tool is available, go to next step. If scan tool is not available, go to step 5.
4. Connect scan tool to data link connector No. 3. see scheme 11- see scheme 13. Start engine. Turn scan tool on. Select ACTIVE TEST MODE on scan tool. Using scan tool manufacturer's instructions, activate EVAP VSV. Go to step 6.
5. Disconnect electrical connector at EVAP VSV. EVAP VSV is front VSV on emission control valve set on top of engine, near intake manifold and contains Blue 2-pin electrical connector. see scheme 118and see scheme 119. Using jumper wires, connect battery voltage and ground to electrical terminals on EVAP VSV to operate EVAP VSV. Start engine. Go to next step.
6. Check vacuum reading on vacuum gauge with engine idling. Vacuum should be.368-19.713 in Hg. or 5-268 in. H 2 O for over 5 seconds. If vacuum is within specification, go to next step. If vacuum reading is not within specification, check for loose or restricted vacuum hose to EVAP service port, or for malfunctioning EVAP VSV. To check EVAP VSV operation, see «EVAP VACUUM SWITCHING VALVE»(ref-3026-S10229262162000041700000).
7. Shut engine off. If using scan tool to operate EVAP VSV, stop operation of EVAP VSV. Remove scan tool. Go to next step. If connecting battery voltage to EVAP VSV to operate EVAP VSV, disconnect jumper wires and reconnect electrical connector on EVAP VSV. Go to next step.
8. Disconnect vacuum gauge from EVAP service port. Connect pressure gauge to EVAP service port. Install hose crimper on air drain hose near charcoal canister. Perform STEP 1 in illustration. (Scheme 68) Charcoal canister is located near fuel tank. see scheme 118and see scheme 119.
9. Apply 13.5-15.5 in. H 2 O of pressure to EVAP service port. After 2 minutes of applying the pressure, the pressure should be 7.7-8.8 in. H 2 O. If pressure is within specification, remove hose crimper and go to next step. If pressure cannot be maintained, remove hose crimper and check for disconnected vacuum hose between EVAP VSV, charcoal canister and fuel tank. If vacuum hose is properly installed on EVAP VSV, charcoal canister and fuel tank, check for stuck open EVAP VSV. To check EVAP VSV operation, see «EVAP VACUUM SWITCHING VALVE»(ref-3026-S10229262162000041700000).
10. With pressure still applied at EVAP service port, remove fuel tank cap and note pressure reading. Pressure should decrease when fuel tank cap is removed. If pressure decreases when fuel tank cap is removed, remove pressure gauge and go to next step. If pressure does not decrease when fuel tank cap is removed, remove pressure gauge and check for restricted vacuum hose between EVAP service port, charcoal canister and fuel tank. Repair or replace vacuum hose as necessary.
11. To check airtightness of fuel tank and fuel inlet pipe, disconnect EVAP line hose from charcoal canister. Perform STEP 2 in illustration. (Scheme 68) Apply.58 psi (.040 kg/cm 2 ) air pressure to EVAP line hose so pressure inside the fuel tank is.58 psi (.040 kg/cm 2 ). Check that pressure inside fuel tank holds steady for one minute.
12. If pressure inside fuel tank holds steady for one minute, reinstall EVAP line hose on charcoal canister. Go to next step. If pressure inside fuel will not hold steady for one minute, check for leaking hoses or pipes at fuel tank and fuel inlet pipe, or for leaks at fuel tank or installed components on fuel tank. If no leaks exist, replace fuel tank and fuel inlet pipe. Reinstall EVAP line hose on charcoal canister. Go to next step. NOTE: Overfill check valve may also be referred to as fill check valve. Cut-off valve may also be referred to as fuel cut-off valve.
13. To check overfill check valve and cut-off valve, disconnect purge line hose and EVAP line hose from charcoal canister, and install cap on air drain hose. Perform STEP 3 in illustration. (Scheme 68)
14. Apply.58 psi (.040 kg/cm 2 ) air pressure to purge line hose fitting on charcoal canister. Perform STEP 3 in illustration. (Scheme 68) Ensure air flows from EVAP line hose when air pressure is applied to purge line hose fitting on charcoal canister. If fuel tank is full of fuel, air may not flow from EVAP line hose, as overfill check valve may be closed. Ensure fuel tank is not full of fuel when checking for airflow at EVAP line hose.
15. If air flows from EVAP line hose, go to next step. If air does not flow from EVAP line hose, check for restrictions in EVAP line hose and vent line hose. If any hose is restricted, replace hose and recheck operation. If hoses are not restricted, replace overfill check valve and cut-off valve located on top of fuel tank. see scheme 118and see scheme 119.
16. Reinstall purge line hose and EVAP line hose on charcoal canister, To check air inlet line, disconnect air inlet line hose from charcoal canister. Perform STEP 4 in illustration. (Scheme 68) Apply air pressure to air inlet line hose. Air should flow through air inlet line hose. If air flows through air inlet line hose, go to next step. If air does not flow through air inlet line hose, check for restricted air inlet line hose or air inlet line.
17. Disconnect necessary electrical connectors and components for removal of charcoal canister. Disconnect hose at vapor pressure sensor. Disconnect purge line hose, EVAP line hose and air inlet line hose from charcoal canister.
18. Push connector on vent line hose toward charcoal canister and pinch both sides of retainer on connector, and then disconnect vent line hose with connector from charcoal canister. (Scheme 69)
19. Remove charcoal canister and vapor pressure sensor retaining bolts. Remove charcoal canister. Inspect charcoal canister for cracks or damage at all hose fittings. If charcoal canister is okay, go to next step. If charcoal canister is defective, replace charcoal canister.
20. To check charcoal canister, install cap on vent port on charcoal canister. (Scheme 70) Apply.26 psi (.018 kg/cm 2 ) air pressure to EVAP port while holding purge port closed. (Scheme 70) Ensure air flows freely from air drain port.
21. Apply.26 psi (.018 kg/cm 2 ) air pressure to EVAP port while holding air drain port and purge port closed. (Scheme 70) Ensure no air flows from air inlet port.
22. Using vacuum pump, apply 1.01 in. Hg of vacuum to purge port. (Scheme 70) Ensure vacuum does not decrease when air inlet port is closed and that vacuum decreases when air inlet port is opened.
23. While holding air inlet port closed, using vacuum pump, apply 1.01 in. Hg of vacuum to EVAP port. (Scheme 70) Ensure air flows into purge port. Remove cap from vent port. Replace charcoal canister if defective.
24. Reinstall charcoal canister. If fuel EVAP system operates properly, it may be necessary to check operation of EVAP Vacuum Switching Valve (VSV), canister closed valve Vacuum Switching Valve (VSV), pressure switching valve Vacuum Switching Valve (VSV) and vapor pressure sensor. See «EVAP VACUUM SWITCHING VALVE»(ref-3026-S10229262162000041700000), «CANISTER CLOSED VALVE VACUUM SWITCHING VALVE»(ref-3026-S18041613302000053000000), «PRESSURE SWITCHING VALVE VACUUM SWITCHING VALVE»(ref-3026-S25425434962000053000000) and «VAPOR PRESSURE SENSOR»(ref-3026-S16314652332000041700000).

Fuel EVAP System Test (Land Cruiser)

Note. Manufacturer provides testing information for testing airtightness of fuel tank and components along with testing of charcoal canister and fuel EVAP system.

Scheme 69

Scheme 70

1. Inspect all lines and connections for sharp bends or damage. Inspect fuel tank for damage, cracks or fuel leakage. Inspect fuel tank cap for cracks or deformed gasket. Replace components if defective or damaged.
2. Start engine and warm engine to normal operating temperature. Shut engine off. Connect vacuum gauge from EVAP system test kit to EVAP service port. EVAP service port is located in purge vacuum hose for EVAP system near charcoal canister in engine compartment. see scheme 120
3. EVAP Vacuum Switching Valve (VSV) must be operated. If scan tool is available, go to next step. If scan tool is not available, go to step 5.
4. Connect scan tool to data link connector No. 3. see scheme 14 Start engine. Turn scan tool on. Select ACTIVE TEST MODE on scan tool. Using scan tool manufacturer's instructions, activate EVAP VSV. Go to step 6.
5. Disconnect electrical connector at EVAP VSV. EVAP VSV is located on driver's side center of intake manifold below intake manifold cover on top of engine and contains Black 2-Pin electrical connector with Blue/Black and Black/Yellow wires. see scheme 120 Using jumper wires, connect battery voltage and ground to electrical terminals on EVAP VSV to operate EVAP VSV. Start engine. Go to next step.
6. Check vacuum reading on vacuum gauge with engine idling. Vacuum should be.368-19.713 in Hg. or 5-268 in. H 2 O for over 5 seconds. If vacuum is within specification, go to next step. If vacuum reading is not within specification, check for loose or restricted vacuum hose to EVAP service port, or for malfunctioning EVAP VSV. To check EVAP VSV operation, see «EVAP VACUUM SWITCHING VALVE»(ref-3026-S10229262162000041700000).
7. Shut engine off. If using scan tool to operate EVAP VSV, stop operation of EVAP VSV. Remove scan tool. Go to next step. If connecting battery voltage to EVAP VSV to operate EVAP VSV, disconnect jumper wires and reconnect electrical connector on EVAP VSV. Go to next step.
8. Disconnect vacuum gauge from EVAP service port. Connect pressure gauge to EVAP service port. Install hose crimper on air drain hose near charcoal canister. (Scheme 71) Charcoal canister is located in driver's side of engine compartment. see scheme 120
9. Apply 13.5-15.5 in. H 2 O of pressure to EVAP service port. After 2 minutes of applying the pressure, the pressure should be 7.7-8.8 in. H 2 O. If pressure is within specification, remove hose crimper and go to next step. If pressure cannot be maintained, remove hose crimper and check for disconnected vacuum hose between EVAP VSV, charcoal canister and fuel tank. If vacuum hose is properly installed on EVAP VSV, charcoal canister and fuel tank, check for stuck open EVAP VSV. To check EVAP VSV operation, see «EVAP VACUUM SWITCHING VALVE»(ref-3026-S10229262162000041700000).
10. With pressure still applied at EVAP service port, remove fuel tank cap and note pressure reading. Pressure should decrease when fuel tank cap is removed. If pressure decreases when fuel tank cap is removed, remove pressure gauge and go to next step. If pressure does not decrease when fuel tank cap is removed, remove pressure gauge and check for restricted vacuum hose between EVAP service port, charcoal canister and fuel tank. Repair or replace vacuum hose as necessary.
11. Remove charcoal canister. Inspect charcoal canister for cracks or damage at all hose fittings. If charcoal canister is okay, go to next step. If charcoal canister is defective, replace charcoal canister.
12. Apply.26 psi (.018 kg/cm 2 ) air pressure to port "A" while holding port "B" closed. (Scheme 72) Ensure air flows freely from port "D".
13. Apply.26 psi (.018 kg/cm 2 ) air pressure to port "A" while holding ports "B" and "D" closed. (Scheme 72) Ensure no air flows from port "C".
14. Using vacuum pump, apply 1.01 in. Hg of vacuum to port "B". Ensure vacuum does not decrease when port "C" is closed and that vacuum decreases when port "C" is opened.
15. While holding port "C" closed, using vacuum pump, apply.39 in. Hg of vacuum to port "A". Ensure air flows into port "B". Replace charcoal canister if defective.
16. Reinstall charcoal canister. If fuel EVAP system operates properly, it may be necessary to check operation of EVAP Vacuum Switching Valve (VSV), vapor pressure sensor and vapor pressure sensor Vacuum Switching Valve (VSV). See «EVAP VACUUM SWITCHING VALVE»(ref-3026-S10229262162000041700000), «VAPOR PRESSURE SENSOR»(ref-3026-S16314652332000041700000) and «VAPOR PRESSURE SENSOR VACUUM SWITCHING VALVE»(ref-3026-S24494525452000041700000).

Fuel EVAP System Test (Sienna)

Note. Manufacturer provides testing information for testing airtightness of fuel tank and components along with testing of charcoal canister and fuel EVAP system.

Scheme 71

Scheme 72

1. Inspect all lines and connections for sharp bends or damage. Fuel inlet pipe may also be referred to as fuel filler pipe. Inspect fuel inlet pipe for cracks, damage or fuel leakage. Inspect fuel tank cap for cracks or deformed gasket. Replace components if defective or damaged.
2. Start engine and warm engine to normal operating temperature. Shut engine off. Connect vacuum gauge from EVAP system test kit to EVAP service port. EVAP service port is located in purge vacuum hose for EVAP system near charcoal canister in engine compartment. see scheme 121
3. EVAP Vacuum Switching Valve (VSV) must be operated. If scan tool is available, go to next step. If scan tool is not available, go to step 5.
4. Connect scan tool to data link connector No. 3. see scheme 15 Start engine. Turn scan tool on. Select ACTIVE TEST MODE on scan tool. Using scan tool manufacturer's instructions, activate EVAP VSV. Go to step 6.
5. Disconnect electrical connector at EVAP VSV. EVAP VSV is front VSV on emission control valve set on top of engine, near intake manifold and contains Blue 2-pin electrical connector. see scheme 121 Using jumper wires, connect battery voltage and ground to electrical terminals on EVAP VSV to operate EVAP VSV. Start engine. Go to next step.
6. Check vacuum reading on vacuum gauge with engine idling. Vacuum should be.368-19.713 in Hg. or 5-268 in. H 2 O for over 5 seconds. If vacuum is within specification, go to next step. If vacuum reading is not within specification, check for loose or restricted vacuum hose to EVAP service port, or for malfunctioning EVAP VSV. To check EVAP VSV operation, see «EVAP VACUUM SWITCHING VALVE»(ref-3026-S10229262162000041700000).
7. Shut engine off. If using scan tool to operate EVAP VSV, stop operation of EVAP VSV. Remove scan tool. Go to next step. If connecting battery voltage to EVAP VSV to operate EVAP VSV, disconnect jumper wires and reconnect electrical connector on EVAP VSV. Go to next step.
8. Disconnect vacuum gauge from EVAP service port. Connect pressure gauge to EVAP service port. Install hose crimper on air drain hose near charcoal canister. (Scheme 73) Charcoal canister is located in driver's side of engine compartment. see scheme 121
9. Apply 13.5-15.5 in. H 2 O of pressure to EVAP service port. After 2 minutes of applying the pressure, the pressure should be 7.7-8.8 in. H 2 O. If pressure is within specification, remove hose crimper and go to next step. If pressure cannot be maintained, remove hose crimper and check for disconnected vacuum hose between EVAP VSV, charcoal canister and fuel tank. If vacuum hose is properly installed on EVAP VSV, charcoal canister and fuel tank, check for stuck open EVAP VSV. To check EVAP VSV operation, see «EVAP VACUUM SWITCHING VALVE»(ref-3026-S10229262162000041700000).
10. With pressure still applied at EVAP service port, remove fuel tank cap and note pressure reading. Pressure should decrease when fuel tank cap is removed. If pressure decreases when fuel tank cap is removed, remove pressure gauge and go to next step. If pressure does not decrease when fuel tank cap is removed, remove pressure gauge and check for restricted vacuum hose between EVAP service port, charcoal canister and fuel tank. Repair or replace vacuum hose as necessary.
11. Remove charcoal canister. Inspect charcoal canister for cracks or damage at all hose fittings. If charcoal canister is okay, go to next step. If charcoal canister is defective, replace charcoal canister.
12. Install plug on port "E" on charcoal canister. (Scheme 74) Apply.26 psi (.018 kg/cm 2 ) air pressure to port "A" while holding port "B" closed. (Scheme 74) Ensure air flows freely from port "D".
13. Apply.26 psi (.018 kg/cm 2 ) air pressure to port "A" while holding ports "B" and "D" closed. (Scheme 74) Ensure no air flows from port "C".
14. Using vacuum pump, apply 1.01 in. Hg of vacuum to port "B". Ensure vacuum does not decrease when port "C" is closed and that vacuum decreases when port "C" is opened.
15. While holding port "C" closed, using vacuum pump, apply 1.01 in. Hg of vacuum to port "A". Ensure air flows into port "B". Replace charcoal canister if defective.
16. Remove plug from port "E" and reinstall charcoal canister. If fuel EVAP system operates properly, it may be necessary to check operation of EVAP Vacuum Switching Valve (VSV), vapor pressure sensor and vapor pressure sensor Vacuum Switching Valve (VSV). See «EVAP VACUUM SWITCHING VALVE»(ref-3026-S10229262162000041700000), «VAPOR PRESSURE SENSOR»(ref-3026-S16314652332000041700000) and «VAPOR PRESSURE SENSOR VACUUM SWITCHING VALVE»(ref-3026-S24494525452000041700000).

Fuel EVAP System Test (Tacoma & 4Runner)

Note. Manufacturer provides testing information for testing airtightness of fuel tank and components along with testing of charcoal canister and fuel EVAP system.

Scheme 73

Scheme 74

1. Inspect all lines and connections for sharp bends or damage. Inspect fuel tank for damage, cracks or fuel leakage. Inspect fuel tank cap for cracks or deformed gasket. Replace components if defective or damaged.
2. Start engine and warm engine to normal operating temperature. Shut engine off. Connect vacuum gauge from EVAP system test kit to EVAP service port. EVAP service port is located in purge vacuum hose for EVAP system near charcoal canister in engine compartment. see scheme 122
3. EVAP Vacuum Switching Valve (VSV) must be operated. If scan tool is available, go to next step. If scan tool is not available, go to step 5.
4. Connect scan tool to data link connector No. 3. see scheme 16and see scheme 18. Start engine. Turn scan tool on. Select ACTIVE TEST MODE on scan tool. Using scan tool manufacturer's instructions, activate EVAP VSV. Go to step 6.
5. Disconnect electrical connector at EVAP VSV. EVAP VSV is located on end of charcoal canister. see scheme 122 Using jumper wires, connect battery voltage and ground to electrical terminals on EVAP VSV to operate EVAP VSV. Start engine. Go to next step.
6. Check vacuum reading on vacuum gauge with engine idling. Vacuum should be.368-19.713 in Hg. or 5-268 in. H 2 O for over 5 seconds. If vacuum is within specification, go to next step. If vacuum reading is not within specification, check for loose or restricted vacuum hose to EVAP service port, or for malfunctioning EVAP VSV. To check EVAP VSV operation, see «EVAP VACUUM SWITCHING VALVE»(ref-3026-S10229262162000041700000).
7. Shut engine off. If using scan tool to operate EVAP VSV, stop operation of EVAP VSV. Remove scan tool. Go to next step. If connecting battery voltage to EVAP VSV to operate EVAP VSV, disconnect jumper wires and reconnect electrical connector on EVAP VSV. Go to next step.
8. Disconnect vacuum gauge from EVAP service port. Connect pressure gauge to EVAP service port. Install hose crimper on air drain hose near charcoal canister. (Scheme 75) Charcoal canister is located in driver's side of engine compartment. see scheme 122
9. Apply 13.5-15.5 in. H 2 O of pressure to EVAP service port. After 2 minutes of applying the pressure, the pressure should be 7.7-8.8 in. H 2 O. If pressure is within specification, remove hose crimper and go to next step. If pressure cannot be maintained, remove hose crimper and check for disconnected vacuum hose between EVAP VSV, charcoal canister and fuel tank. If vacuum hose is properly installed on EVAP VSV, charcoal canister and fuel tank, check for stuck open EVAP VSV. To check EVAP VSV operation, see «EVAP VACUUM SWITCHING VALVE»(ref-3026-S10229262162000041700000).
10. With pressure still applied at EVAP service port, remove fuel tank cap and note pressure reading. Pressure should decrease when fuel tank cap is removed. If pressure decreases when fuel tank cap is removed, remove pressure gauge and go to next step. If pressure does not decrease when fuel tank cap is removed, remove pressure gauge and check for restricted vacuum hose between EVAP service port, charcoal canister and fuel tank. Repair or replace vacuum hose as necessary.
11. Remove charcoal canister. Remove all vacuum switching valves from charcoal canister. Inspect charcoal canister for cracks or damage at all hose fittings. If charcoal canister is okay, go to next step. If charcoal canister is defective, replace charcoal canister.
12. Install plugs on ports "A" and "B". (Scheme 76) Apply.21 psi (.015 kg/cm 2 ) air pressure to port "D" while holding port "C" closed. (Scheme 76) Ensure air flows freely from port "E".
13. Apply.21 psi (.015 kg/cm 2 ) air pressure to port "D" while holding ports "C" and "E" closed. (Scheme 76) Ensure no air flows from port "F".
14. Using vacuum pump, apply.87 in. Hg of vacuum to port "C". Ensure vacuum does not decrease when port "F" is closed and that vacuum decreases when port "F" is opened.
15. While holding port "F" closed, using vacuum pump, apply.87 in. Hg of vacuum to port "D". Ensure vacuum does not decrease when port "C" is closed, and that vacuum decreases when port "C" is opened. Replace charcoal canister if defective.
16. Remove plugs and reinstall charcoal canister. If fuel EVAP system operates properly, it may be necessary to check operation of EVAP Vacuum Switching Valve (VSV), vapor pressure sensor and vapor pressure sensor Vacuum Switching Valve (VSV). See «EVAP VACUUM SWITCHING VALVE»(ref-3026-S10229262162000041700000), «VAPOR PRESSURE SENSOR»(ref-3026-S16314652332000041700000) and «VAPOR PRESSURE SENSOR VACUUM SWITCHING VALVE»(ref-3026-S24494525452000041700000).

Fuel EVAP System Test (Tundra)

Note. Manufacturer provides testing information for testing airtightness of fuel tank and components along with testing of charcoal canister and fuel EVAP system.

Scheme 75

Scheme 76

1. Inspect all lines and connections for sharp bends or damage. Inspect fuel tank for damage, cracks or fuel leakage. Inspect fuel tank cap for cracks or deformed gasket. Replace components if defective or damaged.
2. Start engine and warm engine to normal operating temperature. Shut engine off. Connect vacuum gauge from EVAP system test kit to EVAP service port. EVAP service port is located in purge vacuum hose for EVAP system near charcoal canister in engine compartment. see scheme 123and see scheme 124.
3. EVAP Vacuum Switching Valve (VSV) must be operated. If scan tool is available, go to next step. If scan tool is not available, go to step 5.
4. Connect scan tool to data link connector No. 3. see scheme 17 Start engine. Turn scan tool on. Select ACTIVE TEST MODE on scan tool. Using scan tool manufacturer's instructions, activate EVAP VSV. Go to step 6.
5. Disconnect electrical connector at EVAP VSV. On 3.4L V6, EVAP VSV is located at driver's side rear corner of air intake chamber and contains Black 2-pin connector. see scheme 123 On 4.7L V8, EVAP VSV is located at driver's side center of intake manifold and contains Black 2-pin electrical connector. see scheme 124 On all models, using jumper wires, connect battery voltage and ground to electrical terminals on EVAP VSV to operate EVAP VSV. Start engine. Go to next step.
6. Check vacuum reading on vacuum gauge with engine idling. Vacuum should be.368-19.713 in Hg. or 5-268 in. H 2 O for over 5 seconds. If vacuum is within specification, go to next step. If vacuum reading is not within specification, check for loose or restricted vacuum hose to EVAP service port, or for malfunctioning EVAP VSV. To check EVAP VSV operation, see «EVAP VACUUM SWITCHING VALVE»(ref-3026-S10229262162000041700000).
7. Shut engine off. If using scan tool to operate EVAP VSV, stop operation of EVAP VSV. Remove scan tool. Go to next step. If connecting battery voltage to EVAP VSV to operate EVAP VSV, disconnect jumper wires and reconnect electrical connector on EVAP VSV. Go to next step.
8. Disconnect vacuum gauge from EVAP service port. Connect pressure gauge to EVAP service port. Install hose crimper on air drain hose near charcoal canister. (Scheme 77) Charcoal canister is located in driver's side of engine compartment. see scheme 123and see scheme 124.
9. Apply 13.5-15.5 in. H 2 O of pressure to EVAP service port. After 2 minutes of applying the pressure, the pressure should be 7.7-8.8 in. H 2 O. If pressure is within specification, remove hose crimper and go to next step. If pressure cannot be maintained, remove hose crimper and check for disconnected vacuum hose between EVAP VSV, charcoal canister and fuel tank. If vacuum hose is properly installed on EVAP VSV, charcoal canister and fuel tank, check for stuck open EVAP VSV. To check EVAP VSV operation, see «EVAP VACUUM SWITCHING VALVE»(ref-3026-S10229262162000041700000).
10. With pressure still applied at EVAP service port, remove fuel tank cap and note pressure reading. Pressure should decrease when fuel tank cap is removed. If pressure decreases when fuel tank cap is removed, remove pressure gauge and go to next step. If pressure does not decrease when fuel tank cap is removed, remove pressure gauge and check for restricted vacuum hose between EVAP service port, charcoal canister and fuel tank. Repair or replace vacuum hose as necessary.
11. Remove charcoal canister. Inspect charcoal canister for cracks or damage at all hose fittings. If charcoal canister is okay, go to next step. If charcoal canister is defective, replace charcoal canister.
12. Apply.26 psi (.018 kg/cm 2 ) air pressure to port "A" while holding port "B" closed. (Scheme 78) Ensure air flows freely from port "D".
13. Apply.26 psi (.018 kg/cm 2 ) air pressure to port "A" while holding ports "B" and "D" closed. (Scheme 78) Ensure no air flows from port "C".
14. Using vacuum pump, apply 1.01 in. Hg of vacuum to port "B". Ensure vacuum does not decrease when port "C" is closed and that vacuum decreases when port "C" is opened.
15. While holding port "C" closed, using vacuum pump, apply.39 in. Hg of vacuum to port "A". Ensure air flows into port "B". Replace charcoal canister if defective.
16. Reinstall charcoal canister. If fuel EVAP system operates properly, it may be necessary to check operation of EVAP Vacuum Switching Valve (VSV), vapor pressure sensor and vapor pressure sensor Vacuum Switching Valve (VSV). See «EVAP VACUUM SWITCHING VALVE»(ref-3026-S10229262162000041700000), «VAPOR PRESSURE SENSOR»(ref-3026-S16314652332000041700000) and «VAPOR PRESSURE SENSOR VACUUM SWITCHING VALVE»(ref-3026-S24494525452000041700000).

Scheme 77

Scheme 78

1. Disconnect electrical connector at Canister Closed Valve Vacuum Switching Valve (CCV VSV). CCV VSV is located near air cleaner housing. see scheme 118and see scheme 119. Remove CCV VSV.
2. Using ohmmeter, check that continuity exists between electrical terminals on CCV VSV and resistance is 25-30 ohms @ 68°F (20°C). Replace CCV VSV if no continuity exists or resistance is not within specification.
3. Ensure no continuity exists between each electrical terminal and body of CCV VSV. Replace CCV VSV if continuity exists between electrical terminal and body of CCV VSV.
4. To test CCV VSV operation, apply air pressure to port "A". Ensure air flows from port "B". Perform STEP 1 in illustration. see scheme 141and see scheme 142.
5. Apply battery voltage and ground to electrical terminals on CCV VSV. Apply air pressure to port "A". Ensure air does not flow from port "B". Perform STEP 2 in illustration. see scheme 141and see scheme 142. Replace CCV VSV if defective.

Cut-Off Valve (Avalon, Camry & Camry Solara)

Individual component testing is not available from manufacturer. Manufacturer provides testing information for testing airtightness of fuel tank and components along with testing of charcoal canister, cut-off valve and fuel EVAP system. See appropriate FUEL EVAP SYSTEM TEST.