Using Vacuum Pump
Evaporative System Leak Inspection Using Vacuum PumpWhole system inspection
1. Disconnect the vacuum hose between the purge solenoid valve and the charcoal canister from the purge solenoid valve side.
2. Insert hose on the vacuum pump.
3. Connect the WDS or equivalent to the DLC-2.
4. Turn the ignition switch on (Engine OFF).
5. Close the canister drain cut valve (CDCV) using ON BOARD DEVICE CONTROL function (mode 08).
NOTE:
- The CDCV is closed for 10 min unless the following actions is done:
- The engine is started.
- The ignition key is turned to OFF.
- The fuel tank pressure sensor signal exceeds 6.43 kPa {48.3 mmHg, 1.9 in Hg}.
6. Apply vacuum of 1.7 kPa (13 mmHg, 0.5 inHg} and monitor FTP sensor output voltage.
7. Verify that the voltage holds at the specified readings for a minimum of 2 min.
- If the voltage does not hold, inspect the fuel tank pressure sensor.
- If the fuel tank pressure sensor is okay, carry out the Inspection from charcoal canister to fuel tank".
Inspection from charcoal canister to fuel tank
1. Inspect for loose and improperly connected hoses between the charcoal canister and the fuel tank. (See EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM LOCATION INDEX.)
2. Disconnect the vacuum hose between the charcoal canister and the pressure control valve from the charcoal canister.
3. Insert hose into the vacuum pump.
4. Apply vacuum of 1.7 kPa {13 mmHg, 0.5 inHg}.
5. Verify that the vacuum holds at the specified readings for a minimum of 2 min.
- If the vacuum does not hold, inspect the fuel tank, related vacuum hoses and fuel-filler cap.
- If the fuel tank, related vacuum hoses and fuel-filler cap are okay, carry out the "Inspection from charcoal canister to fuel tank".
Inspection from charcoal canister to purge solenoid valve
1. Inspect for loose and improperly connected hoses between the charcoal canister and the purge solenoid valve. (See EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM LOCATION INDEX.)
2. Disconnect the vacuum hose between the charcoal canister and the purge solenoid valve from the charcoal canister.
3. Insert hose into the vacuum pump.
4. Apply vacuum of 3.3 kPa {25 mmHg, 1.0 inHg}.
Vacuum should remain at the specified readings for a minimum of 2 min.
- If the vacuum does not hold, inspect the following:
- Catch tank for plugging, damages and pinhole using vacuum pump
- Purge solenoid valve
- Charcoal canister for damage and pinhole
- CDCV for damage and leakage
- Detached, incorrectly installed or cracked hose from charcoal canister to CDCV