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Vacuum cut valve bypass valve

How to repair it

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On what make model and year and what does this valve do and where is it on engine?

Posted on Jan 02, 2013

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Posted on Jan 02, 2017

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2 Answers

WATER DOES NOT CIRCULATE THRU HEATER CORE ON 2005 GMC SIERRA


It sounds like the bypass valve is stuck open. Check bypass valve and vacuum hoses attached to it.
Hope this helps.
Bob

Jan 06, 2015 | 2005 GMC Sierra

2 Answers

2002 Pathfinder code p1491


Try replacing gas cap first before you spend any money on more on repairs

Aug 18, 2012 | 2002 Nissan Pathfinder

1 Answer

Where is the vacuum cut valve located,,, the code reads p1441 what to fix it or replace it my self.....


I just found the answer that
The vacuun cut bypass valves I deal with are in the evap emissions hoses near the charcoal canister valve is white in color and have no electrical connections just (4) 5/8" vacuum lines. Two of those hoses go to a solonid valve with a two wire electrical connection. Gasoline in the signal hoses from over filling the tank can cause the tank pressure sensor to send the wrong evap emission information to the Engine computer that in turn sets the P1441 code. Those hoses are on the filler neck to the gas tank pull them off one at a time and see if one has about 1 oz of fuel in the rubber hose (no smoking). Good luck for you!

alldata car repair database

Aug 01, 2012 | 2001 Nissan Altima

1 Answer

Check engine code P0418 comes on


P0418 Secondary Air Injection System Relay 'A" Circuit Malfunction.
The DTC P0418 is detected the the AIR vacuum control solenoid circuit not operating as desired by the PCM.

An air pump is used on the vehicle to lower tail pipe emissions on start-up. The Powertrain Control Module PCM grounds the Air pump relay control circuit which energizes the Air pump. The PCM also grounds the Air combination valve vacuum control solenoid circuit, which energizes the Air vacuum control solenoid. Vacuum is then applied to both Air combination valve diaphragms which opens the shut off valves. The PCM enables both circuits simultaneously when Air system operations id desired. When the AIR system is active, then Air pump forces fresh air into the exhaust stream in order to accelerate catalyst operation. The AIR combination valves replace the conventional check valves. When the AIR system is inactive the shut off valves prevent air flow in either direction.

Symptoms:
- Engine Light ON (or Service Engine Soon Warning Light)
- Engine hesitation

Possible Causes:
- Air Pump inoperative.
- Air bypass solenoid circuit open or shorted.
- Faulty AIR byspass solenoid circuit

Possible Solution:
- Visually inspect AIR pump harness and connector. Repair if necessary.
- Visually inspect AIR bypass valve harness and connector. Repair if necessary.
- Replaced AIR bypass valve
- Replaced Air pump


Hope this helps (remember to rate this answer)

Dec 10, 2010 | 2003 Volkswagen Passat

1 Answer

2004 niisan infinty g35x code p2135


NISSAN OBDII DTC

P1105 Manifold Absolute Pressure/Barometric Pressure Switch Solenoid Circuit

P1110 Intake Valve Timing Control Circuit (Bank 1)

P1120 Secondary Throttle Position Sensor Circuit

P1125 Tandem Throttle Position Sensor Circuit

P1132 Intake Valve Timing Control Position Sensor (Bank 1)

P1135 Intake Valve Timing Control Circuit (Bank 2)

P1137 Intake Valve Timing Control Position Sensor (Bank 2)

P1140 Intake Valve Timing Control Position Sensor (Bank 1)

P1145 Intake Valve Timing Control Position Sensor (Bank 2)

P1148 Closed Loop Fault Detected (Bank 1)

P1168 Closed Loop Fault Detected (Bank 2)

P1210 Traction Control System Signal Fault

P1220 Fuel Pump Control Module Fault

P1320 Ignition Control Signal Fault

P1335 Crankshaft Position Sensor Circuit

P1336 Crankshaft Position Sensor circuit

P1400 EGR/EVAP Control Solenoid Circuit

P1401 EGR Temperature Sensor Circuit

P1402 EGR System Fault Detected

P1440 EVAP Canister System Leak Detected

P1441 EVAP Vacuum Cut Valve Bypass Valve Circuit

P1443 EVAP Canister Control Vacuum Switch Circuit

P1444 EVAP Canister Purge Volume Control Valve Circuit

P1445 EVAP Purge Volume Control Valve

P1446 EVAP Canister Vent Valve Circuit

P1447 EVAP Canister Purge Flow/Volume Control Valve Circuit

P1448 EVAP Vent Control Valve Circuit

P1490 EVAP Vent Control Valve/Bypass Valve Circuit

P1491 EVAP Vacuum Cut Valve/Bypass Valve Circuit

P1492 EVAP Canister Purge Control Valve/Solenoid Valve

P1605 Transmission Control Module A/T Diagnosis Communication Line Fault

P1705 Throttle Position Switch Circuit

P1706 Park Neutral Position Switch Circuit

P1760 Overrun Clutch Solenoid Valve Circuit
P1900 Cooling Fan Control Circuit
sorry but your code reader is not reading manufacturers codes ,if an american market vehicle then you should be able to read them but if this is a europeon model then how did you manage to get this code??

P0235....Turbo/Super Charger Boost Sensor 'A' Circuit

this is a generic code if its any help

Nov 02, 2010 | 2004 Infiniti G35 Sport Coupe

2 Answers

P 2138 code with service engine soon light on?


Accelerator Pedal Position Error.

P2138 - Accelerator Pedal Position Sensor Circuit Range / Performance Problem

Clear the code - if it recurs, change the sensor.


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Sep 15, 2010 | 2006 Nissan Altima

2 Answers

What is a 1491 error?


this code is specifically for the vacuum cut valve bypass valve in the evap system. either the valve is not working, is clogged up or a hose is cut

Dec 29, 2009 | 1996 Nissan Maxima

1 Answer

1998 Altima GXE has a code of P1491. It was


Code P1491 is not the PVC Valve.It is the Vacuum Cut Valve Bypass Valve.
Which is located above and away from the egr canister under the driver side rear bumper it is round and have about 3 hoses connected to it. if it is from a check engine light that says look at vacume cut valve check the egr canisters purge valve some times they stick and throw the wrong code

Sep 01, 2009 | 1998 Nissan Altima

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