On Board Refueling Vapor Recovery (ORVR)

ON BOARD REFUELING VAPOR RECOVERY (ORVR)


Diagnosis Procedure


SYMPTOM: FUEL ODOR FROM EVAP CANISTER IS STRONG.
1.CHECK EVAP CANISTER
1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached.
2. Weigh the EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached.
The weight should be less than 2.0 kg (4.4 lb).
OK or NG
OK - GO TO 2.
NG - GO TO 3.
2.CHECK IF EVAP CANISTER IS SATURATED WITH WATER





Does water drain from the EVAP canister?
Yes or No
Yes - GO TO 3.
No - GO TO 6.
3.REPLACE EVAP CANISTER
Replace EVAP canister with a new one.
- GO TO 4.
4.CHECK DRAIN FILTER
Testing and Inspection.
OK or NG
OK - GO TO 5.
NG - Replace drain filter.
5.DETECT MALFUNCTIONING PART
Check the EVAP hose between EVAP canister and vehicle frame for clogging or poor connection.
- Repair or replace EVAP hose.
6.CHECK REFUELING EVAP VAPOR CUT VALVE
Testing and Inspection.
OK or NG
OK - INSPECTION END
NG - Replace refueling EVAP vapor cut valve with fuel tank.

SYMPTOM: CANNOT REFUEL/FUEL ODOR FROM THE FUEL FILLER OPENING IS STRONG

WHILE REFUELING.
1.CHECK EVAP CANISTER
1. Remove EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached.
2. Weigh the EVAP canister with EVAP canister vent control valve and EVAP control system pressure sensor attached.
The weight should be less than 2.0 kg (4.4 lb).
OK or NG
OK - GO TO 2.
NG - GO TO 3.
2.CHECK IF EVAP CANISTER IS SATURATED WITH WATER





Does water drain from the EVAP canister?
Yes or No
Yes - GO TO 3.
No - GO TO 6.
3.REPLACE EVAP CANISTER
Replace EVAP canister with a new one.
- GO TO 4.
4.CHECK DRAIN FILTER
Testing and Inspection.
OK or NG
OK - GO TO 5.
NG - Replace drain filter.
5.DETECT MALFUNCTIONING PART
Check the EVAP hose between EVAP canister and vehicle frame for clogging or poor connection.
- Repair or replace EVAP hose.
6.CHECK VENT HOSES AND VENT TUBES
Check hoses and tubes between EVAP canister and refueling control valve for clogging, kinks, looseness and improper connection.
OK or NG
OK - GO TO 7.
NG - Repair or replace hoses and tubes.
7.CHECK FILLER NECK TUBE
Check recirculation line for clogging, dents and cracks.
OK or NG
OK - GO TO 8.
NG - Replace filler neck tube.
8.CHECK REFUELING EVAP VAPOR CUT VALVE
Testing and Inspection.
OK or NG
OK - GO TO 9.
NG - Replace refueling EVAP vapor cut valve with fuel tank.
9.CHECK FUEL FILLER TUBE
Check filler neck tube and hose connected to the fuel tank for clogging, dents and cracks.
OK or NG
OK - GO TO 10.
NG - Replace fuel filler tube.
10.CHECK ONE-WAY FUEL VALVE-I
Check one-way valve for clogging.
OK or NG
OK - GO TO 11.
NG - Repair or replace one-way fuel valve with fuel tank.
11.CHECK ONE-WAY FUEL VALVE-II
1. Make sure that fuel is drained from the tank.
2. Remove fuel filler tube and hose.





3. Check one-way fuel valve for operation as follows.
When a stick is inserted, the valve should open, when removing stick it should close.
Do not drop any material into the tank.
OK or NG
OK - INSPECTION END
NG - Replace fuel filler tube or replace one-way fuel valve with fuel tank.