WHERE IS THE VAPOR CANISTER VENT VALVE ON 2012 CHEVROLET CAPTIVA V6? IS IT ON THE CANISTER? ALSO WHERE IS THE FUEL PRESSURE SENSOR ? I am getting obd II for gross leak on evap.alrady replaced fuel cap and purge valve solenoid. fuel cap on tight and no noticeable on the evap lines
My car has an automatic transmission.
Hi there. The purge solenoid valve is typically located on the passenger side of the vehicle, under the hood and attached to the firewall. In order to locate yours and to review the correct removal and installation procedures, I would highly recommend purchasing a service and repair manual for your 2012 Chevrolet Captiva Sport, or have one of our professional mobile mechanics complete your EVAP purge solenoid replacement.
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The canister vent valve closes the fuel tank vent to prevent outside air from entering the EVAP system during an evaporative system leak test.
The Vent Solenoid is a normally open valve that is commanded closed to seal the EVAP system and stop air flow into the charcoal canister. The Purge Solenoid is normally closed but is opened by the PCM to allow manifold vacuum in the EVAP system — thus drawing fuel vapours from the EVAP system.
The main issue with not repairing the EVAP system is that of passing an emissions test as required in most states. Anytime this system is not working properly, your car will not pass an emissions test.
The canister vent solenoid is normally open, and is closed only when the evap system is undergoing a leak check monitor. A vent valve that`s stuck closed will cause refueling problems.
To clean an unopened valve, spray its openings with mass air flow (MAF) sensor cleaner, and shake it. Let it dry before reinstalling it in your car. Alternatively, split the 2 valve pieces apart. Spray the openings of the solenoid with MAF sensor cleaner.
Basically all you need to do is locate your Fuel Tank Vent Line and unplug it from the Charcoal Canister. Locate your Vapor Purge Valve and unplug the lower hose that connects to the Charcoal Canister. Now plug the Fuel Tank Vent Line directly to the Vapor Purge Valve.
Yes, you are still safe to drive. The EVAP (Evaporated Emission Control System) is used to prevent gasoline vapors from escaping into the air from the fuel tank system to control greenhouse emissions.
A P0451 code is an OBD-II fault code defined as “Evaporative Emission System Pressure Sensor/Switch.” This code is triggered when the vehicle`s Powertrain Control Module (PCM) detects an inaccurate or erratic voltage signal from the Evaporative Emission Control System Pressure Sensor.
The purge valve, also known as the canister purge valve, is part of your vehicle`s evaporative emission control (EVAP) system.
in most cases, evap system problems are not caused by the canister itself but by related valves. in some rare instances, however, the canister can crack or become clogged. also, a failure somewhere else in the fuel or evap system can allow gasoline to enter the canister, ruining it.
The fuel tank may build excessive pressure due to a blocked vent. This could cause fuel to spray on occupants or bystanders when opening the fuel cap, potentially causing injury. Additionally, if an ignition source was present, this could create a risk of fire, causing injury and/or damage to property.
This can lead to damage to the tank itself and potentially even cause a fuel leak. In addition, if the tank is not properly vented, pressure can build up inside the tank as the fuel expands due to changes in temperature. This can cause the tank to rupture, posing a serious hazard to the vehicle and anyone nearby.
One commonly used solenoid valve is one that is normally open. This valve works slightly different than a valve that is normally closed. The basic function of the normally open solenoid valve is the same. A normally open solenoid valve controls the flow of gas or liquid.
If the valve is stuck closed instead of open, the fuel vapours will not be pushed back into the engine. Instead, they will come straight out of the car exhaust, causing much higher emission levels.
A vehicle`s vapor canister is an important part of its federally mandated emissions control system. When properly installed and maintained, the vapor canister reduces the amount of evaporated fuel a car or truck emits.
A P0446 error code indicates an evaporative emission control system (EVAP) vent control circuit malfunction. Simply put, the computer has detected an issue regarding the functionality of your vehicle`s EVAP system vent valve.
If done correctly the codes will clear themselves and the light will not come on until another problem comes up.
An evap leak is the same thing as a vacuum leak. A vacuum leak will certainly cause the engine to run roughly. I would recommend having your vacuum levels checked with a vacuum gauge by a qualified professional to determine whether they are in specification.
Typical EVAP system pressure or vacuum is only approx. . 75 InHg. (For example, normal engine manifold vacuum is 20 InHg gauge, or 10 InHg absolute) Therefore these tables only show what you might see during normal EVAP system testing or operation.
Any large leak in your evaporative emission control system, or EVAP system, can signal trouble code P0455.
In the charcoal canister, the purge valve is the opening that releases fuel vapors that were absorbed by the charcoal back into the engine for combustion. A failed purge valve is one of many causes for check engine lights, and it is often difficult for mechanics to diagnose.
In newer model vehicles the purge valve is electrically operated solenoid controlled by the engine computer. When your engine is off the valve is closed. Once your engine is up and running the computer continuously and moderately opens the purge valve.
How long and what is the process to replace a fuel pressure sensor?
ANSWER : A professional mechanic would require roughly 5 hours. (If just the regulator is replaced that takes about 1 hour). Some parts, as noted below, cannot be re-used, you need a precision inch pound torque wrench, FSM instructions (and TSB updates if applicable; procedure was changed in 2007 for instance) and the system has to be bled when done.
Below is partial list of steps, copied and pasted directly from the service manual:
1. Disconnect battery and put protective material in front of the charge air cooler (CAC) or damage to the CAC may occur.
2. Remove air cleaner assembly.
3. Disconnect the oil drain tube from the crankcase vent oil separator.
4. Loosen the air cleaner outlet tube clamp and detach the air cleaner outlet tube from the turbocharger.
5. Remove the bolts, the crankcase vent oil separator and the air cleaner outlet pipe as an assembly.
6. Remove and discard the crankcase vent oil separator press-in-place gasket. (To re-install, tighten to 13 Nm (115 lb-in).
7. Disconnect the PCM electrical connector (BE SURE BATTERY IS DISCONNECTED FIRST!) and retainer. Disconnect the in-line electrical connector and position the engine wiring harness on the engine.
8. Remove the pushnuts and the glow plug module heat shield.
9. Disconnect the high-pressure fuel injection pump electrical connector and detach the retainer from the glow plug module bracket. Disconnect the glow plug module and the exhaust gas recirculation temperature (EGRT) sensor electrical connectors, detach the wiring retainer and position the wiring harnesses aside.
10. Remove the nut and position the ground strap aside. To install, tighten to 13 Nm (115 lb-in).
11. Remove the engine wiring harness bolt. To install, tighten to 13 Nm (115 lb-in).
12. Remove the heater supply tube nut. To install, tighten to 13 Nm (115 lb-in).
13. Remove the bolts and the glow plug module bracket. To install, tighten to 13 Nm (115 lb-in).
14. Remove the nut and position the transmission fluid indicator tube aside. To install, tighten to 8 Nm (71 lb-in).
Warning: Do NOT disconnect the glow plug electrical connector before dislodging the seal from the valve cover or the wiring harness may be damaged.
15. Using an appropriate tool, dislodge the glow plug wiring harness seals from the valve cover.
16. Disconnect the glow plug electrical connectors by pulling on the glow plug wiring harness tee above the seal. Remove the glow plug wiring harness.
17. Remove the nut and position the crankcase ventilation drain tube aside.
18. Disconnect the wiring harness retainer from the valve cover stud.
19. Disconnect the wiring harness retainer from the generator bracket.
20. Disconnect the A/C pressure switch electrical connector. Position the harness aside.
Warning: Do not bend or flex the heater supply tube or damage to the tube may occur.
21. Remove the stud bolts, bolts and the valve cover. Remove and discard the valve cover gasket. To install, tighten to 9 Nm (80 lb-in).
Warning: Contact with exposed fuel injector wiring, if energized, may result in electric shock.
Use care when working on or around energized fuel injector wiring. Fuel injector wiring supplies HIGH VOLTAGE to operate the fuel injectors of course, you disconnected the battery though.
22. Disconnect the fuel rail pressure (FRP) sensor electrical connector.
Warning: Fuel injection equipment is manufactured to VERY precise tolerances and fine clearances (think space shuttle). To prevent fuel system damage, it is essential that absolute cleanliness is observed when working with these components. Always install fuel system caps on any open orifices or tubes.
23. Remove the FRP sensor. To install, tighten the FRP sensor in 2 stages.
Stage 1: Tighten to 7 Nm (62 lb-in).
Stage 2: Tighten an additional 40 degrees.
24. Bleed the high-pressure fuel system.
If you feel like this job may be too overwhelming or run into any issues, consider YourMechanic to get it done. One of our mobile technicians can come to your home and replace the fuel pressure sensor at your own convenience.
