Evaporative Emissions System: Testing and Inspection

EVAP CANISTER
Check EVAP canister as follows:
1. Pinch the fresh air hose.
2. Blow air into port (A) and check that air flows freely through port (B).




TIGHTENING TORQUE
Tighten EVAP canister as shown in the figure.
Make sure new O-ring is installed properly between EVAP canister and EVAP vent control valve.







FUEL TANK VACUUM RELIEF VALVE (Built into fuel filler cap)
1. Wipe clean valve housing.
2. Check valve opening pressure and vacuum.

Pressure: 15.3 - 20.0 kPa (0.156 - 0.204 kg/sq.cm , 2.22 - 2.90 psi)

Vacuum: -6.0 to -3.5 kPa (-0.061 to -0.036 kg/sq.cm , -0.87 to -0.48 psi)

3. If out of specification, replace fuel filler cap as an assembly.

CAUTION: Use only a genuine fuel filler cap as a replacement. If an incorrect fuel filler cap is used, the MIL may come on.




EVAP SERVICE P0RT
Positive pressure is delivered to the evaporator system through the evaporator service port. If fuel vapor leakage in the evaporator system occurs, use a leak detector to locate the leak.

HOW TO DETECT FUEL VAPOR LEAKAGE

CAUTION:
- Never use compressed air or a high pressure pump.
- Do not start engine.
- Do not exceed 4.12 kPa (0.042 kg/sq.cm , 0.6 psi) of pressure in EVAP system.




EVAPORATIVE EMISSION LINE DRAWING

With Consult

NOTE: Improper installation of adapter to the service port may cause a leak.

1. Attach the adapter securely to the EVAP SERVICE port.
2. Also attach the pressure pump and hose.
3. Turn ignition switch "ON".
4. Select the "EVAP SYSTEM CLOSE" of "WORK SUP- PORT MODE" with CONSULT




5. Touch "START". A bar graph (Pressure indicating display) will appear on the screen.
6. Apply positive pressure to the EVAP system until the pressure indicator reaches the middle of the bar graph.
7. Remove adapter and hose with pressure pump.




8. Locate the leak using a leak detector. Refer to "Evaporative Emission Line Drawing".

OR

Without Consult
1. Attach the adapter securely to the EVAP service port and pressure pump with pressure gauge to the EVAP service port.







2. Apply battery voltage to between the terminals of both EVAP canister vent control valve and vacuum cut valve bypass valve to make a closed EVAP system.
3. To locate the leak, deliver positive pressure to the EVAP system until pressure gauge points reach 1.38 to 2.76 kPa (0.014 to 0.028 kg/cm , 0.2 to 0.4 psi).
4. Remove adapter and hose with pressure pump.
5. Locate the leak using a leak detector. Refer to "Evaporative Emission Line Drawing".