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ORVR valve needs to be replaced - 2004 Toyota Sienna

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What is P 1491 in Nissan pathfinder 2003 and how to fix it


DTC 1491 (VACUUM CUT VALVE BYPASS VALVE) DIAGNOSIS

SERVICE PROCEDURE

1. Confirm the Vacuum Cut Valve is installed correctly

NOTE :

^ The Vacuum Cut Valve will not work correctly and a DTC will be stored if it is installed upside-down.

^ The Vacuum Cut Valve is a white plastic valve near the fuel tank and EVAP canister.


2. Connect CONSULT-II and turn the ignition key to "N" (do not start the engine).

3. On CONSULT II, select ENGINE - DATA MONITOR - SELECTION FROM MENU - EVAP SYSTEM PRESSURE SENSOR.

4. Note the EVAP System Pressure Sensor Voltage Confirm that it is reading in a normal range for a key ON arid engine OFF condition.

NOTE :For 2001 models and earlier:

^ Voltage in step 4 should be near 3.36 volts.

^ The normal range is between 3.32 - 3.40 volts.


For 2002 models:

^ Some 2002 models use a new type EVAP System Pressure Sensor with different operational characteristics.

^ Refer to the EC section of the appropriate Service Manual to determine which type sensor your vehicle is equipped with.

^ Models that use the new type EVAP System Pressure Sensor will have a voltage reading that varies with changes in the "barometric" pressure (atmospheric air pressure that changes with altitude and/or weather conditions).

^ The usual voltage range obtained in step 4 with the new type EVAP System Pressure Sensor is between 3.8 and 4.2 volts. Because this range will vary with barometric pressure, it is best to compare readings with a known good vehicle.

^ Some 2002 models use the earlier type EVAP System Pressure Sensor (same as used on 2001 and earlier models). The normal range for the earlier type is 3.32 to 3.40 volts and does not vary with barometric pressure.


5. Start the engine. Observe the EVAP System Pressure Sensor voltage.

^ If the value has reduced 0.04 volts or more from the reading obtained in step 4, the EVAP Canister Purge Volume Control Solenoid Valve may be leaking.

^ Refer to the EC section of the appropriate Service Manual for inspection procedures of the EVAP Canister Purge Volume Control Solenoid Valve, DTC P1444.


NOTE :The EVAP Canister Purge Volume Control Solenoid Valve is located in the engine compartment.

6. Perform the DTC Confirmation Procedure for DTC P1491. Refer to the EC section of the appropriate Service Manual for confirmation procedure steps and driving conditions.

7. If the DTC confirmation results are NG, do the following:

a. Refer to the EC section of the appropriate Service Manual to determine if the vehicle is equipped with On-Board Refueling Vapor Recovery (ORVR).

^ If the vehicle has ORVR, go to b.

^ If the vehicle does NOT have ORVR, go to step 8.

b. Place a clamp on the Refueling EVAP Vapor Line near the fuel tank. The Refueling EVAP Vapor Line is the larger hose (see figure 2). Use hose clamp (3M P/N # 08556-1), found in Fuel Injector Cleaning Kit J-45701, or equivalent.

c. Retry DTC Confirmation Procedure

d. If the result is now OK, the Refueling Control Valve may be leaking and should be inspected. Refer to the EC section of the appropriate Service Manual for Refueling Control Valve inspection procedures.

8. If the DTC confirmation is still NG after step 7, or the vehicle is not equipped with ORVR, do the following:

a. Disconnect two (2) lines from the Vacuum Cut Valve. One that goes to the fuel tank and one that goes to the EVAP Canister (see figure 1).

b. Use a hand vacuum pump to check each of the two (2) disconnected hoses for free flow. Make sure they are clear into the fuel tank (vent line) and into the EVAP Canister (see figure 2).


NOTE :

^ Figure 2 includes ORVR system. Refer to the appropriate service manual to determine if your vehicle has ORVR or not.

^ The lines between the Vacuum Cut Valve and Fuel Tank, and between the Vacuum Cut Valve and EVAP Canister may go through a metal line. Make sure the lines are clear between the Vacuum Cut Valve and Fuel Tank, and between the Vacuum Cut Valve and EVAP Canister, including any metal lines.

c. If any blockage is found, determine the cause and repair as necessary. Blockage in either of these lines will cause a DTC.


9. If all of the above checks do not locate the source of the incident, refer to the appropriate Service Manual for further DTC P1491 diagnosis.

Jun 29, 2011 | Nissan Pathfinder Cars & Trucks

1 Answer

I fill up my 01 kia sportag and after 2 gallons it starts to overflow. There is no obstruction in the tubing. what could that possibly be


ITS THE ORVR VALVE ITS ON TOP OF THE TANK BESIDE THE FUEL PUMP. HOW IT WORKS IS WHEN YOU FILL UP THE TANK IT VENTS OUT THE AIR SO IT WILL NOT SPILL BACK OUT THE SPOUT . YOUR VALVE IS STICKING .

Feb 04, 2011 | 2001 Kia Sportage

1 Answer

I'm having a problem geting gas in the tank. It acts like its full. The filler neck is unobstructed, but it will only take it very slowly.


YOU EITHER NEED A VENT VALVE FILTER FOR THE EVAP SYSTEM OR A ORVR VALVE IS STICKING WHICH IS LOCATED IN THE TANK IT ALLOWS AIR TO BLEED OFF WHILE YOUR FILLING THE TANK.

Jan 17, 2011 | 2002 Kia Sedona

2 Answers

I need an answer for engine code P1457 auxiliary emission control


CODE P1457 EVAP SYSTEM LEAK DETECTED CANISTER AREA 5 POSSIBLE CAUSES 1- EVAP CANISTER IS LEAKING DAMAGED OR FULL OF WATER. 2- EVAP CANISTER PURGE LINE IS LOOSE DAMAGED OR BLOCKED. 3 - EVAP TWO WAY VALVE OR ORVR VENT SHUT VALVE IS DAMAGED. 4 - EVAP FUEL TANK VAPOR CONTROL VALVE IS DAMAGED OR HAS FAILED. 5 - PCM HAS FAILED.

Sep 06, 2010 | 1998 Honda Accord

1 Answer

P1456 code


Trouble Code: P1456


EVAP System Very Small Leak (0.020") Detected

Possible Causes:


EVAP control system pressure sensor is damaged or has failed

EVAP purge solenoid is damaged or has failed

EVAP canister vent control valve is damaged or has failed

Fuel tank cap not tightened properly or the wrong part number

Fuel tank temperature sensor is damaged or has failed

Fuel tank vacuum relief valve is damaged or has failed

Very small leak in the EVAP canister or in the fuel tank area

ORVR system is damaged or has a small leak in a component

Refueling control valve is damaged or has failed

Sep 10, 2009 | 2002 Nissan Maxima

1 Answer

Engine light after i overfill gaz tank 2004 4runner


The light didnt come one because you filled it =while it was running, its on because you overfilled it. You pushed gasoline passed the rollover valve, into the charcoal canister which is probably now saturated. It may push raw fuel into the intake, which will make the engine run rough. Chances are, you need a new charcoal canister, ORVR, corrugated hose, and Purge valve

Jan 13, 2009 | 2002 Toyota 4Runner

1 Answer

2006 jeep liberty will not take gas keeps clicking off gas pump. 3rd time at dealer. dealer has no idea what's wrong


The ORVR (On-Board Refueling Vapor Recovery) system consists of a unique fuel tank, flow management valve, fluid control valve, one-way check valve and vapor canister.

The ORVR (On-Board Refueling Vapor Recovery) system is used to remove excess fuel tank vapors. This is done while the vehicle is being refueled..

Fuel flowing into the fuel filler tube (approx. 1 inches I.D.) creates an aspiration effect drawing air into the fuel fill tube. During refueling, the fuel tank is vented to the EVAP canister to capture escaping vapors. With air flowing into the filler tube, there are no fuel vapors escaping to the atmosphere. Once the refueling vapors are captured by the EVAP canister, the vehicle's computer controlled purge system draws vapor out of the canister for the engine to burn. The vapor flow is metered by the purge solenoid so that there is no, or minimal impact on driveability or tailpipe emissions.

As fuel starts to flow through the fuel fill tube, it opens the normally closed check valve and enters the fuel tank. Vapor or air is expelled from the tank through the control valve and on to the vapor canister. Vapor is absorbed in the EVAP canister until vapor flow in the lines stops. This stoppage occurs following fuel shut-off, or by having the fuel level in the tank rise high enough to close the control valve. This control valve contains a float that rises to seal the large diameter vent path to the EVAP canister. At this point in the refueling process, fuel tank pressure increases, the check valve closes (preventing liquid fuel from spiting back at the operator), and fuel then rises up the fuel filler tube to shut off the dispensing nozzle.

Dec 22, 2008 | 2006 Jeep Liberty

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