Evaporative Emissions System: Testing and Inspection
EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEMINSPECTION
1. REMOVE EXHAUST TAIL PIPE AND HEATED INSULATOR
2. INSPECT LINES AND CONNECTORS
Visually check for loose connections, sharp bends or damage.
3. INSPECT FUEL TANK FILLER PIPE
Visually check for deformation, cracks or fuel leakage.
4. INSPECT FUEL TANK CAP
Visually check if the cap and/or gasket are deformed or damaged.
If necessary, repair or replace the cap.
5. 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. TOYOTA hand-held tester:
Forced driving of the VSV for the EVAP.
1. Connect a TOYOTA hand-held tester to the DLC3.
2. Start the engine.
3. Push the TOYOTA hand-held tester main switch ON.
4. Use the ACTIVE TEST mode on the TOYOTA hand-held tester to operate the VSV for the EVAP.
d. If you have no TOYOTA 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. If you have TOYOTA hand-held tester:
Conclude forced driving of the VSV for the EVAP.
1. Stop the engine.
2. Disconnect the TOYOTA hand-held tester from the DLC3.
g. If you have no TOYOTA 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, and 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't add pressure, you can conclude that the hose connecting the VSV-canister-fuel tank has slipped off or the VSV is open.
6. CHECK AIRTIGHTNESS IN FUEL TANK AND FILLER PIPE
a. TOYOTA hand-held tester:
Forced driving of the VSV for the canister closed valve (CCV).
1. Connect a TOYOTA hand-held tester to the DLC3.
2. Turn the ignition switch ON.
3. Push the TOYOTA hand-held tester mode on the TOYOTA hand-held tester to operate the VSV for the canister closed valve (CCV).
b. If you have no TOYOTA hand-held tester:
Forced driving of the canister closed valve (CCV).
1. Remove the connector cover from the ECM.
2. Turn the ignition switch ON.
3. Connect the between terminal CCV of the ECM connector and body ground.
c. Add the pressure from the EVAP service port to 1.6 kPa (16.3 kgf/sq.cm, 0.232 psi).
d. Check that the pressure can be held for 30 seconds.
e. Visually check the fuel tank and filler pipes.
f. Check each connection of hoses and pipes.
If there is abnormality, replace the fuel tank and filler pipe.
7. CHECK AIR INLET LINE
a. Disconnect the air inlet line hose from the fresh air valve.
b. Disconnect the air inlet hose from the air cleaner case.
c. Blow air into the air inlet line hose.
d. Check that the air flows from the air inlet line hose.
e. Visually check the air inlet me hoses and pipes.
f. Check each connection of hoses and pipes.
If there is abnormality, replace the air inlet line hose and pipe.
8. REMOVE CHARCOAL CANISTER ASSEMBLY
a. Remove the fuel tank
b. Disconnect the 3 hoses from the charcoal canister.
c. Remove the 2 bolts and charcoal canister from the fuel tank.
d. Remove the 2 bolts and VSV for purge flow switching from the charcoal canister.
9. INSPECT CHARCOAL CANISTER
a. Visually check the charcoal canister for cracks or damage.
b. While holding port C closed, using low pressure compressed air (4.9 kPa (50 gf/sq.cm, 0.71 psi), blow into port A and check that air flows without resistance from the port B.
c. Using low pressure compressed air (4.9 kPa (50 gf/sq.cm, 0.71 psi), blow into port A and check that air flows without resistance from the other ports.
If a problem is found, replace the charcoal canister.
10. REINSTALL CHARCOAL CANISTER ASSEMBLY
11. REMOVE TRAP FILTER AND FRESH AIR VALVE
a. Remove the fuel tank.
b. Disconnect the air inlet hoses from the VSV for canister closed valve.
c. Disconnect the connector from the fresh air valve.
d. Remove the bolt and disconnect the air opening valve from the VSV for canister closed valve.
e. Remove the 2 bolts and VSV for canister closed valve with the trap filter.
f. Remove the 2 bolts and trap filter from the VSV for canister closed valve.
12. INSPECT TRAP FILTER
a. Visually check the trap filter for cracks or damage.
b. Inspect the trap filter operation.
Blow air into port A, check that the air flows from port B. If a problem is found, replace the trap filter.
13. INSPECT FRESH AIR VALVE
a. Visually check the fresh air valve for cracks or damage.
b. Inspect the fresh air valve operation.
Blow air into port A, check that the air flows from port B and C.
If a problem is found, replace the fresh air valve.
14. REINSTALL TRAP FILTER AND FRESH AIR VALVE