Evaporative Emissions System: Testing and Inspection

INSPECTION




EVAP Canister
Check EVAP canister as follows:
1. Pinch the fresh air hose.
2. Blow air into port A and check that it flows freely out of 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 canister 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 -3.3 kPa (-0.061 to -0.034 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 Port
Positive pressure is delivered to the EVAP system through the EVAP service port. If fuel vapor leakage in the EVAP 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 exceed 4.12 kPa (0.042 kg/sq. cm, 0.6 psi) of pressure in EVAP system.

NOTE:
- Do not start engine.
- Improper installation of EVAP service port adapter to the EVAP service port may cause a leak.







With CONSULT
1. Attach the EVAP service port adapter securely to the EVAP service port.
2. Also attach the pressure pump and hose to the EVAP service port adapter.
3. Turn ignition switch "ON".
4. Select the "EVAP SYSTEM CLOSE" of "WORK SUPPORT 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 EVAP service port adapter and hose with pressure pump.
8. Locate the leak using a leak detector. Refer to "EVAPORATIVE EMISSION LINE DRAWING".










Without CONSULT
1. Attach the EVAP service port adapter securely to the EVAP service port.
2. Also attach the pressure pump with pressure gauge to the EVAP service port adapter.
3. 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.
4. To locate the leak, deliver positive pressure to the EVAP system until pressure gauge points reach 1.38 - 2.76 kPa (0.014 - 0.028 kg/sq. cm, 0.2 - 0.4 psi).
5. Remove EVAP service port adapter and hose with pressure pump.
6. Locate the leak using a leak detector. Refer to "EVAPORATIVE EMISSION LINE DRAWING".







EVAPORATIVE EMISSION LINE DRAWING

NOTE: Do not use soapy water or any type of solvent while installing vacuum hose or purge hoses.