Scan Tool Testing and Procedures

How to Detect Fuel Vapor Leakage




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.

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.

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

WITH CONSULT-II
1. Attach the EVAP service port 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 SUPPORT" mode with CONSULT-II.
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 the EVAP service port adapter and hose with pressure pump.




8. Locate the leak using a leak detector. Refer to "EVAPORATIVE EMISSION LINE DRAWING".

9. If the check result is NG, repair or replace the malfunctioning parts. If OK, touch "BACK" on CONSULT-II screen.
10. Start engine and warm it up to normal operating temperature.
11. Turn ignition switch "OFF" and wait at least 10 seconds.
12. Restart engine and let it idle for 90 seconds.
13. Keep engine speed at 2,000 rpm for 30 seconds.
14. Turn ignition switch "OFF".




WITHOUT CONSULT-II
1. Attach the EVAP service port 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/sq.cm, 0.2 to 0.4 psi).
4. Remove the EVAP service port adapter and hose with pressure pump.
5. Locate the leak using a leak detector. Refer to "EVAPORATIVE EMISSION LINE DRAWING".

6. If the check result is NG, repair or replace the malfunctioning parts. If OK, stop applying battery voltage to EVAP canister vent control valve and vacuum cut valve bypass valve.
7. Reconnect harness connectors to EVAP canister vent control valve and vacuum cut valve bypass valve.
8. Start engine and warm it up to normal operating temperature.
9. Turn ignition switch "OFF" and wait at least 10 seconds.
10. Restart engine and let it idle for 90 seconds.
11. Keep engine speed at 2,000 rpm for 30 seconds.
12. Turn ignition switch "OFF".