Using Vacuum Pump
Evaporative Emission (EVAP) System Leak Inspection Using Vacuum PumpWhole system inspection
1. Disconnect the vacuum hose between the purge solenoid valve and the catch tank from the purge solenoid valve.
2. Insert the hose on the vacuum pump.
3. Connect the WDS or equivalent to the DLC-2.
4. Turn the ignition switch to ON.
5. Close the canister drain cut valve (CDCV) using ON BOARD DEVICE CONTROL function.
NOTE:
- The CDCV is closed for 10 min unless the following any action 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 inHg}.
6. Apply 1.7 kPa {13 mmHg, 0.5 inHg} vacuum and monitor FTP 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 wrongly 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 fuel tank from the charcoal canister.
3. Insert the hose on the vacuum pump.
4. Apply 1.7 kPa {13 mmHg, 0.5 inHg} vacuum.
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 purge solenoid valve".
Inspection from charcoal canister to purge solenoid valve
1. Inspect for loose and wrongly 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 catch tank from the charcoal canister.
3. Insert the hose on the vacuum pump.
4. Apply vacuum to 3.3 kPa {25 mmHg, 1.0 inHg} and it should remain at the specified readings for a minimum of 2 min.
5. Return to the DTC Inspection Procedures, and answer questions.