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No vacuum to vsv valve

Code po401

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE:

Hi there,
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Posted on Jan 02, 2017

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Mustgo
  • 2360 Answers

SOURCE: po401 and po420 (95 toyota previa Van super charged engine)

Check for air leak into system after MAF.

Check for

vacuum leaks on intake manifold,

the air tube between the air filter.

intake manifold vacuum hose.

===
clean throttle plate with Berryman carburator cleaner

SEE sample picture HERE
===


Check for loose or no connected vacuum hose(s).


Take it for a test drive.


Please rate my answer if it's useful to you.


Cheers,

Mustgo

Posted on Dec 19, 2009

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Mustgo
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SOURCE: 1997 pontiac grand prix se has code po401. I

Check for

vacuum leaks on intake manifold,

the air tube between the air filter.

intake manifold vacuum hose.

===
clean throttle plate with Berryman carburator cleaner

SEE sample picture HERE
===

Also remove carbon built up behind the EGR valve and the EGR passage tube.

===

Vacuum leak WILL offset the intended 14.7 to 1 air fuel ratio.

More un-metered air (leaks) will lean out the fuel mixture.

Use small amount of Berryman carb clearer at potential air leak area will help you identify trouble spot.

At idle,just spray and listen for the RPM surge.

The in-rush of carb clearer will increase the RPM on the motor.

Record the problem spot(s) and address it later.

===

EGR carbon built up require 2+ hours to clean from start to finish.

You will need a new EGR base gasket before your start.

Locate and remove the EGR valve after the vehicle is cool down.

Carefully record the connector and vacuum line (for older vehicle) location by drawing an easily to follow diagram.

Remove the EGR valve.

Inspect the location of the carbon built-up inside the valve and the EGR passage tube.

SOAK these areas with WD-40 spary.

You will need a small screwdriver,cloth hanger and lot of newspaper and time to get this cleaning done right.

RE-SOAK the carbon and let it sit for over-night will also help.

One the last round,pass a shop vacuum of the EGR valve and the passage pipe.

Install the new EGR gasket and connectors.

Allow the vehicle to warm up outdoor to burn up any remaining WD-40.


Take it for a test drive.


Please rate my answer if it's useful to you.


Cheers,

Mustgo

Posted on Dec 19, 2009

redbeard00
  • 957 Answers

SOURCE: have a 99 ford ranger keep getting code po401

The MAF sensor could affect the EGR valve but I would look at the MAP first. You may have an exhaust leak you don't know about. Unfortunately without looking at live data or doing component testing you will play the parts change game.
Some components can be tested by most part stores, so ask first.

Posted on May 05, 2010

Testimonial: "thanks lot having it check on thusday another mec said it migt be in the egr tubes. thanks again. i hope this fixes my truck good site to get some help. "

  • 70 Answers

SOURCE: I have a 99 Windstar 3.8L Keep getting DTC PO401

Does the egr vavle open ? You will need to use a scanner to test the dpfe voltage when the egr valve is energized you should read around 3.5 4.00 volts. Also you could remove the vacume line from the egr valve and with the engine running you should see around 100 rpm drop in engine rpm at least this would indicate the egr valve is capable of flowing egr gases through the system to the cylinders.

Posted on May 30, 2010

  • 492 Answers

SOURCE: Engine started missing and lost

what was the complete egr code definition

Posted on Jan 27, 2011

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1 Answer

Kept getting a code po401


Did you check to make sure the ports going and coming from the egr are open, not clogged with oil and carbon deposits ? Common failure is a clogged port.

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I replaced the VSV with the used one but I got 33Ohm when I tested. Now that I have the codes P401 & P446. What is the problem I ran into now?


what was the vacuum switching valve for? but po401 is insufficient exhaust gas flow from e.g.r. valve and po446 is the canister purge control solenoid circuit. what are we working on also this can help me better.

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Error code 441 need to know how to fix &repair


Here is the definition for the code.
You may need a shop manual for the actual test procedures.


P0441 MITSUBISHI Description The vapor pressure sensor, Voltage Solenoide Valve (VSV) for EVAP, Voltage Solenoide Valve (VSV) for canister closed valve (CCV) and Valve Solenoide Valve (VSV) for pressure switching valve are used to detect abnormalities in the evaporative emission control system. The ECM decides whether there is an abnormality in the evaporative emission control system based on the vapor pressure sensor signal. Diagnostic Trouble Code (DTC) P0441 is recorded by the ECM when there is a malfunction in either the VSV for EVAP, the VSV for pressure switching valve, or in the vapor pressure sensor itself, or when evaporative emissions leak from the components within the dotted line in Fig. 1 below.

The ECM closes the CCV and opens the VSV for pressure switching valve causing vacuum to increase in the entire EVAP system. The ECM continues to operate the VSV for EVAP until the vacuum is increased to a specified point at which time the ECM closes the VSV for EVAP. If the vacuum did not increase, or if the vacuum increased beyond the specified limit, the ECM judges the VSV for EVAP and related components to be faulty.
Read more: http://engine-codes.com/p0441_mitsubishi.html#ixzz26BwvoUBv

Sep 11, 2012 | 2001 Mitsubishi Montero Sport 4WD

1 Answer

CODE PO441 DODGE INTRAPID 2002 EREPAIR


Here is the definition of the code.
Possible causes are a defective gas cap or a leak in the vent system.

P0441 DODGE Description The vapor pressure sensor, Voltage Solenoide Valve (VSV) for EVAP, Voltage Solenoide Valve (VSV) for canister closed valve (CCV) and Valve Solenoide Valve (VSV) for pressure switching valve are used to detect abnormalities in the evaporative emission control system. The ECM decides whether there is an abnormality in the evaporative emission control system based on the vapor pressure sensor signal. Diagnostic Trouble Code (DTC) P0441 is recorded by the ECM when there is a malfunction in either the VSV for EVAP, the VSV for pressure switching valve, or in the vapor pressure sensor itself, or when evaporative emissions leak from the components within the dotted line in Fig. 1 below.

The ECM closes the CCV and opens the VSV for pressure switching valve causing vacuum to increase in the entire EVAP system. The ECM continues to operate the VSV for EVAP until the vacuum is increased to a specified point at which time the ECM closes the VSV for EVAP. If the vacuum did not increase, or if the vacuum increased beyond the specified limit, the ECM judges the VSV for EVAP and related components to be faulty.
Read more: http://engine-codes.com/p0441_dodge.html#ixzz242qD9pXO

Aug 19, 2012 | 1997 Toyota Camry

1 Answer

My 2004 Mazda 3 GT 2.3L is getting a P0446 DTC and is burning through a tank of gas in about 2-3 days depending on the amount of driving being done. My Mazda dealer believes that it may be the fuel pump,...


P0446- Evaporative Emissions Control System Vent Control Circuit Malfunction

Possible Causes:
- Missing Fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- Incorrect fuel tank vacuum relief valve

Code is detected when VSV for pressure switching valve is ON, ECM judges that there is no continuity between vapor pressure sensor, fuel tank and charcoal canister (2 trip detection logic)

The vapor pressure sensor, Voltage Solenoide Valve (VSV) for EVAP, Voltage Solenoide Valve (VSV) for canister closed valve (CCV) and Valve Solenoide Valve (VSV) for pressure switching valve are used to detect abnormalities in the evaporative emission control system.

The ECM decides whether there is an abnormality in the evaporative emission control system based on the vapor pressure sensor signal.

Diagnostic Trouble Code (DTC) P0446 is recorded by the ECM when there is a malfunction in either the VSV for EVAP, the VSV for pressure switching valve, or in the vapor pressure sensor itself, or when evaporative emissions leak from the components within the dotted line in Fig. 1 below.
evaporative_evap_system_toyota.gif
The ECM closes the CCV and opens the VSV for pressure switching valve causing vacuum to increase in the entire EVAP system.

The ECM continues to operate the VSV for EVAP until the vacuum is increased to a specified point at which time the ECM closes the VSV for EVAP.

If the vacuum did not increase, or if the vacuum increased beyond the specified limit, the ECM judges the VSV for EVAP and related components to be faulty.

Aug 26, 2011 | Mazda MAZDA3 Cars & Trucks

2 Answers

How to fix code po401 and po 340


here's a link to some information on the codes you asked about
P0401
P0340

good luck!

May 18, 2011 | 1996 Toyota Camry

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