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Where is the vapour pressure sensor located - 1999 Toyota Camry

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Normal place is under the front wing on the top of the carbon canistor.

Posted on Aug 20, 2010

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1999 sonoma 2.2 with carburator, code P0452 will not start in the morning. add some fuel into carb will start right away?

this is an EVAP pressure sensor code. which should not cause a no start. has to do with emissions vapours

Sep 04, 2014 | Cars & Trucks


Fuel systems on cars

2) Fuel: From tank to engine

The modern fuel tank is fitted with a sealed filler cap. Set within the fuel tank is the fuel level sender which sends a signal to the fuel gauge indicator on the dashboard. Fuel is drawn by a pre-pump (lifter pump),also within the tank, through a filter 'sock' or strainer to prevent bulky debris rom entering the fuel line; the pre-pump maybe located outside but near to thefuel tank. Also connecting to the tank is the fuel return pipe and often on top of the tank can also be found a pressure sensor. Associated with the tank there is often an expansion vessel to accommodate thermal expansion of the fuel. Finally attached to the top of the tank, or top of the expansion vessel, there is a fuel vapour recovery pipe that is part of the evaporative loss emission control system employed to prevent fuel vapour release to the environment (see later in this series).
Fuel is pumped from the tank by the pre-pump through the fuel line towards the engine: on some systems a further 'main' fuel pump may lie between the fuel tank and engine. The fuel, now under considerable pressure, passes through an in-line fuel filter that removes any fine particulates before they reach the engine. A clogged fuel filter puts a strain on the fuel pump so routinely changing the fuel filter can help prolong the pump's service life. On reaching the engine compartment the fuel line connects to the fuel rail mounted on the engine. The injectors feed directly off this pressurized fuel rail. Mounted onto the end of the fuel rail after the injectors is the fuel pressure relief (FPR) valve which governs the fuel pressure in the line all the way back to the fuel pump(s).
The critical component within the FPR is a spring loaded diaphragm whose role is to maintain a constant force on the relief valve. Fuel, pressurized by the action of the fuel pump, is forced against the valve and excess pressure allows fuel to bleed past to the return fuel line back to the fuel tank. Attached to the top of the fuel pressure regulator is a vacuum line connected to the inlet manifold. The vacuum partially offsets the action of the diaphragm spring. When the engine is at idle, the throttle plate is closed and the manifold vacuum is at its greatest (lowest pressure), the strong vacuum sucks back on the diaphragm against the spring pressure allowing a reduction in the fuel pressure needed to open the relief valve. This reduction in fuel pressure helps minimize fuel consumption per each injection cycle when at idle. Conversely, when the engine is running at high speed, the throttle is wide open creating little or no vacuum in the plenum. This reduces the pull back on the FPR diaphragm and consequently the fuel pressure in the fuel rail is at its highest.
In 'common rail' designs the injectors are controlled by the ECU. The ECU controls the injection cycle time (pulse width) and, in very modern systems, the actual injection pattern. When the car is at idle the injection times are short and when under load the injection times are longer. Similarly when the engine is cold (as indicated by the engine coolant sensor to the ECU) the injection times are longer to ensure a richer starting mixture. The combination of injection time, along with the fuel pressure in the fuel rail, dictates the engine speed and fuel consumption.
In recent years evaporative loss emission control systems (EVAP) have been introduced to prevent the escape of fuel vapour from cars. The fuel vapour that evaporates from the surface of the fuel in the tank is conveyed by the vapour relief pipe to a charcoal filled canister. The fuel vapour is stored in the charcoal for later use by the engine. Access to the stored vapour held in the canister is controlled by electrically operated valves. When the engine is cold the charcoal canister purge valve is kept closed. At normal operating temperature (signalled from the coolant temperature sensor to the ECU) the purge valve opens allowing the stored vapour to contribute to the air in the inlet manifold. The charcoal canister also has a vent valve operated either electrically or passively, in response to internal pressure drop, which when open introduces fresh air to help flush residual vapour out of the charcoal canister.
NEXT 3) Spark: from battery to spark plug

on Jul 15, 2011 | Mercedes-Benz E-Class Cars & Trucks

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What are the symptoms of a bad purge valve?

venting problems resulting in fuel starvation after a period of running, fuel vapour smell, injector faults from excessive pressure , difficulty in filling the tank. Best to run fault codes to find the faulty sensor /unit.

Jul 22, 2014 | 2006 Volkswagen Jetta

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What is wrong when you fuel your vehicle and turn the ignition and it does not start?

could of burnt the pump possible as well vapour lock in tank sensor causing to high pressure you can open up the cap of gas tank and try to start it

May 10, 2014 | 2006 Cadillac SRX V6

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My problem is a come and go thing. At times i can get no more than 50 mph when this has happened I have noticed when I remove the fuel cap theres is a lot of pressure released or it is air taken in. It is...

The tank breather is blocked.
The tank needs outside air to enter as the fuel is pumped out, if this is not happening, the tank is pulled into negative pressure and this will prevent the fuel from being drawn at the correct rate.
The tank vent is a pipe from the tank which is then usually attached to the chassis and nothing else. It may have some form of vapour lock on the end to prevent gas fumes from escaping and forming a fire risk. This is the pipe that is blocked or the vapour lock is blocked. Locate it and remove it to clean it but DONT leave the vapour lock off the pipe when you refit it..
Some fuel tanks are vented through the fuel cap and don't have this pipe so check and make sure that the correct cap is fitted. You can also drill a very small hole through the top of the cap which may allow air to enter the tank although this is not advisable as there would be no vapour lock.

Jan 21, 2011 | Dodge Ram 3500 Cars & Trucks

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I replaced my knock sensors the other day truck ran fine for a while then two more codes came up po107 and po449 where should i go know

The two codes may refer to the same fault/ THe p0107 says that the Manifold absolute pressure is wrong in other words the amount of air gaining entry to your inlet manifold is incorrect. The P0449 says that the vent valve on the vapour emission control system is open. I think it is more than likely that the open vent valve is allowing air to be sucked into the inlet manifold and this is also being noted by the MAP sensor. If it easy replace the vent valve. A quick fix just to keep you going until the vent valve can be replaced is to locate the vacuum line supply from the vapour emission control charcoal canister and to clamp it closed. This will remove the MAP sensor error and allow the engine to run as it should. THis is only temporary as the vent valve fault will persist until it is fixed.

Aug 20, 2010 | 2003 Chevrolet Silverado 1500

2 Answers

1998 isuzu rodeo s/ls troble codes p0452


This fault code is related to a low pressure signal from your EVAP system which is to do with your purge canisiter system for the fuel vapours etc.

You could have a faulty sensor in this system.

Aug 13, 2010 | Isuzu Rodeo Cars & Trucks

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Why does it say check fuel cap

Your fuel system pressure sensor is detecting a vacuum leak. Sometimes it is the cap, sometimes there is a leak in the vapour recovery system. So check your cap. It can reduce your fuel economy. good luck

Jun 13, 2010 | 2000 Mercury Mountaineer

2 Answers

2002 ford taurus hesitats fills like missing computer code say egr sensor changed it but still does it engine light on. fills like lossing spark at all speeds but idle how do you check coil out put? worse...

Find a shop that does scope meter testing. They will be able to give you coil's output.
You may have a faullty plug wire . Take a spray bottle full of water spray it on spark plug wires and see if the engine decreases in idle. If so you need new wires.

With regards to eng lite. have ECU scanned again may be a different code. Autozone does this free of charge.
Did you clean out the carbon on the EGR passage before you put new EGR in?

Apr 24, 2010 | 2002 Ford Taurus

1 Answer

P0450 CODE ON 1997 T100 V6 PICKUP. WHAT IS it and how can I fix it?

Good day
P0450 is Evaporate emission system pressure sensor/switch
the cause could be
1. short or open in the vapor pressure sensor circuit
2.vapour pressure sensor
3. ECM

You can test with the following
you can access the ECM behind the glove box. turn ignition on,backprobe the ECM connector, on A/T models, measure voltage between terminals #1 (green/black wire) and #22 (brown/black wire) at the ECM E6 connector. on M/T models measure the voltage between terminals #1 (green/black wire) and #9 (brown/black wire) at ECM E6. if voltage is 4.5 - 5.5 volts, go to the next step. If the voltage is not 4.5 - 5.5 volts, replace ECM and retest.
2. back-probe ECM connector on A/T models measure voltage between terminals #15 (red/blue wire) and #22 (brown/black wire) at ECM E6. on M/T models measure voltage between terminals #4 (red/blue wire) at ECM E5 and connector #9 (brown/black wire) at ECM E6 connector. on all models disconnect the vacuum hose from the vapor pressure sensor. sensor is located near the brake master cylinder. connect a vacuum pump to sensor. if voltage is 2.9-3.7 volts without vacuum applied and 1.3-2.1 volts with .59 in.Hg (2kpa) vacuum applied. replace ECM and retest if voltage is not as specified go to next step.
3. check for open r short circuit in the wiring harness between vapor pressure sensor and ECM. repair wiring as necessary. if wiring harness is okay replace the vapor pressure sensor.

Hope this helps


Jul 13, 2009 | 1997 Toyota T100

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