Evaporative Emissions System: Testing and Inspection

COMPONENTS





1. VISUALLY INSPECT LINES AND CONNECTIONS
Look for loose connections, sharp bends or damage.
2. VISUALLY INSPECT FUEL TANK
Look for deformation, cracks or fuel leakage.





3. VISUALLY INSPECT FUEL TANK CAP
Check if the cap and/or gasket are deformed or damaged. If necessary, repair or replace the cap.
4. INSPECT TVV OPERATION WITH COLD ENGINE
(a) The engine coolant temperature should be below 45°C (113°F).
(b) Disconnect the EVAP hose from the union pipe.
(c) Start the engine.





(d) Gradually increase the engine speed from idle to 3,000 rpm, and check that air suction is not felt at the union pipe.
5. INSPECT VCV OPERATION WITH HOT ENGINE
(a) Warm up the engine.





(b) With the engine idling, check that air suction is not felt at union pipe.





(c) Gradually increase the engine speed to 3,000 rpm, and check that there is air suction at the union pipe.
(d) Reconnect the EVAP hose to the union pipe.
IF NO PROBLEM IS FOUND WITH THIS INSPECTION SYSTEM IS NORMAL; OTHERWISE INSPECT EACH PART
6. REMOVE CHARCOAL CANISTER AND BRACKET ASSEMBLY
7. REMOVE CHARCOAL CANISTER FROM BRACKET
8. REMOVE CAP FROM CHARCOAL CANISTER





9. VISUALLY INSPECT CHARCOAL CANISTER Look for cracks or damage.
10. INSPECT FOR CLOGGED FILTER AND STUCK VALVE





(a) Using low pressure compressed air (7.26 kPa, 74 gf/sq.cm, 1.05 psi), blow into tank port and check that air flows without resistance from the other ports.





(b) While holding drain port closed, blow air (1.96 kPa, 20 gf/ sq.cm, 0.28 psi) into purge port and check that air flow without resistance from tank port.
If a problem is found, replace the charcoal canister.





11. CLEAN FILTER IN CANISTER
Clean the filter by blowing 294 kPa (3 kgf/sq.cm, 43 psi) of compressed air into tank port while holding purge port closed.

NOTICE:
- Do not attempt to wash the canister.
- No activated carbon should come out.

12. REINSTALL CAP TO CHARCOAL CANISTER
13. REINSTALL CHARCOAL CANISTER TO BRACKET

Torque: 14 N.m (145 kgf.cm, 10 ft.lbf)

14. REINSTALL CHARCOAL CANISTER AND BRACKET ASSEMBLY

Torque: 18 N.m (185 kgf.cm, 13 ft.lbf)

15. DRAIN ENGINE COOLANT





16. REMOVE TVV FROM CYLINDER HEAD
(a) Disconnect the 2 vacuum hoses from the TVV.
(b) Remove the TVV.
17. INSPECT TVV OPERATION





(a) Cool the TVV to below 45°C (113°F) with cool water.
(b) Check that air flows from port J to the air filter.





(c) Heat the TVV to above 64°C (147°F) with hot water.
(d) Check that air flows from port J to K.
If operation is not as specified, replace the TVV.





18. REINSTALL TVV
(a) Apply adhesive to 2 or 3 threads of the TVV.

Adhesive:
Part No. 08833-00070, THREE BOND 1324 or equivalent

(b) Install the TVV.

Torque: 29 N.m (300 kgf.cm, 22 ft.lbf)

(c) Connect the 2 vacuum hoses to the TVV.
19. REFILL WITH ENGINE COOLANT
20. REMOVE INTAKE MANIFOLD STAY
Remove the 2 bolts and intake manifold stay.





21. REMOVE VCV
Disconnect the 4 hoses from the VCV, and remove the TVV.
22. INSPECT VCV





(a) Apply vacuum above 9.3 kPa (70 mmHg, 2.76 in.Hg) to port S.
(b) Blow air into port Y, and check that air comes out of port Z.
(c) Release the applied vacuum.





(d) Blow air into port Y, and check that air does not come out of port Z.
If operation is not as specified, replace the VCV.
23. REINSTALL VCV
Connect the 4 hoses to the VCV.
24. INSTALL INTAKE MANIFOLD STAY
Install the intake manifold stay with the 2 bolts.

Torque: 36 N.m (360 kgf.cm, 26 ft.lbf)