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P1441 code p1441. Is this a FTP sensor problem? Where is it located and what is involved in changing it? Thanks

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  • Jeremy W.
    Jeremy W. Feb 07, 2012

    year, make, model, engine size?

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  • Cars & Trucks Master
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If you go to this site it lists the definition of this code by make, it also lists the possible causes of the problems that trigger the P1441 to be set in memory. Since you gave no specific info on the car or truck that is the best i can provide to help you diagnose this.

Posted on Feb 07, 2012

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Posted on Jan 02, 2017

MNfisherman
  • 11896 Answers

SOURCE: after changing fuel pump 2 days ago on my 97

You can test the MAF before replacing. It may be a problem with the circuit itself or just a fluke from another problem that is connected to this sensor.

There are two basic types of mass airflow sensors: hot wire and hot film. In the first type, a very thin wire (about 0.2 mm thick) is used as the heated element.
f27-31.gif Components of a hot wire-type mass airflow sensor. Courtesy of Ford Motor Company. The element temperature is set at 100° to 200°C above incoming air temperature. Each time the ignition switch is turned to the off position, the wire is heated to approximately 1,000°C for 1 second to burn off any accumulated dust and contaminants.
The second type uses a nickel foil sensor, which is kept 75°C above ambient air temperatures. It does not require a burn-off period and therefore is potentially longer lasting than the hot wire type.
A faulty MAF will cause driveability problems resulting from incorrect ignition timing and improper air/fuel ratios.
Vane-type MAF Sensors
A vane-type MAF sensor is found on many import and domestic vehicles with EFI. All intake air must flow through the sensor. Some MAF sensors are called volume air flow meters

  • Begin checking a vane-type MAF sensor by checking the voltage supply wire and the ground wire to the MAF module before checking the sensor voltage signal.
  • Always follow the recommended test procedure in the manufacturer's service manual and use the specifications supplied by the manufacturer.
  • Typically, to test the sensor, a digital multimeter (DMM) is used and set on a DC voltage scale. The negative meter lead is connected to ground and the red lead to the MAF signal wire.
f_32.44.gif A voltmeter connected to measure the signal from a MAF sensor. Reproduced with permission from Fluke Corporation.
  • Turn on the ignition switch and press the min/max button, if available, on the DMM.
  • Slowly push the MAF vane from the closed to the wide-open position, and allow the vane to slowly return to the closed position.
f_27.33.gif Move the MAF sensor air vane from open to close to test it. Reproduced with permission from Fluke Corporation.
  • Observe the maximum and minimum voltage readings as the vane was moved.
  • If the minimum voltage signal is zero, there may be an open circuit in the MAF sensor variable resistor.
  • When the voltage signal is not within the manufacturer's specifications, replace the sensor.
WARNING While pushing the mass air flow sensor vane open and closed, be careful not to mark or damage the vane or sensor housing.
  • Some vehicle manufacturers specify ohmmeter tests for the MAF sensor.
  • With the MAF sensor removed, connect the ohmmeter across the sensor's output and input terminals.
f_32.45.gif Ohmmeter connections to a MAF sensor. Reprinted with permission.
  • The resistance at these terminals is normally 200 to 600 ohms.
  • Connect the ohmmeter leads to the specified MAF sensor terminals, and move the vane from the fully closed to the fully open position.
  • With each specified meter connection and vane position, the ohmmeter should indicate the specified resistance.
f_32.46.gif Resistance specifications for a typical MAF sensor with door open and closed. Reprinted with permission.
  • When the ohmmeter leads are connected to the sensor's input and output terminals, the ohmmeter reading should increase smoothly as the sensor vane is opened and closed.
  • To check a vane-type MAF with a lab scope, connect the positive lead to the output signal terminal and the negative scope lead to a good ground.
  • This type MAF should display an analog voltage signal when the engine is accelerated. A defective MAF will have sudden and erratic voltage changes.
f_32.47.gif The trace of a defective vane-type MAF sensor. Reproduced with permission from Fluke Corporation. Hot-Wire-Type MAF Sensors
The test procedure for heated resistor and hot-wire MAF sensors varies depending on the vehicle make and year. Always follow the test procedure in the appropriate service manual. A frequency test may be performed on some MAF sensors, such as the AC Delco MAF on some General Motors' products.
  • To check the MAF sensor's voltage signal and frequency, connect a voltmeter across the MAF voltage signal wire and ground wire.
  • Start the engine and observe the voltmeter reading.
  • On some MAF sensors, this reading should be 2.5 volts.
  • Lightly tap the MAF sensor housing with a screwdriver handle and watch the voltmeter pointer.
  • If the pointer fluctuates or the engine misfires, replace the MAF sensor.
  • Some MAF sensors have experienced loose internal connections, which cause erratic voltage signals and engine misfiring and surging.
  • Set the DMM so that it can read the frequency of DC voltage.
  • With it still connected to the signal wire and ground, the meter should read about 30 Hz with the engine idling.
  • Now, increase the engine speed, and record the meter reading at various speeds.
  • Graph the frequency readings. The MAF sensor frequency should increase smoothly and gradually in relation to engine speed.
  • If the MAF sensor frequency reading is erratic, replace the sensor.
f_32..48.gif Satisfactory and unsatisfactory MAF sensor frequency readings. Reproduced with permission from Fluke Corporation.
  • When a scanner is used to diagnose a General Motors' vehicle, one test mode displays grams per second from the MAF sensor. This mode provides an accurate test of the MAF sensor.
  • The grams per second reading should be 4 to 7 with the engine idling.
  • This reading should gradually increase as the engine speed increases.
  • When the engine speed is constant, the grams-per-second reading should remain constant.
  • If the grams-per-second reading is erratic at a constant engine speed or if this reading varies when the sensor is tapped lightly, the sensor is defective.
  • A MAF sensor fault code may not be present with an erratic grams-per-second reading, but the erratic reading indicates a defective sensor.
  • Frequency-varying types of MAF sensors can be tested with a lab scope.
  • The waveform should appear as a series of square waves.
f_32.49.gif A normal trace for a frequency-varying MAF sensor. Courtesy of Progressive Diagnostics--WaveFile AutoPro.
  • When the engine speed and intake air flow increases, the frequency of the MAF sensor signals should increase smoothly and proportionately to the change in engine speed.
  • If the MAF or connecting wires is defective, the trace will show an erratic change in frequency.
f_32.50.gif The trace of a defective frequency-varying MAF sensor. Courtesy of EDGE Diagnostics Systems.

There is also a
Mass Air Flow (MAF) Burn-Off Module Operation:
00375_maf_burn_off_module.jpgA semi-conductor control for an electronic-ignition system.

Posted on Nov 17, 2009

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I have a 1995 gmc jimmy. After service light came on, I had codes read. I had a smoke test done, lines were bad. I replaced them, had code cleared and light is back on!! Code is p1441. Any ideas or su


P1441 CHEVROLET Description The Engine Control Module (ECM) has detected vacuum flow to the Fuel Tank Pressure (FTP) sensor during a system sealed condition. Possible causes are a faulty canister purge solenoid or a faulty tank pressure sensor.

Read more: http://engine-codes.com/p1441_chevrolet.html#ixzz21ZntUMpS

Jul 24, 2012 | 1995 GMC Jimmy

1 Answer

P1441 code for 1997 Chevy Cavalier.


what engine?

Most likely the purge solenoid is leaking. It is usually located on the drivers side of the engine. It will have two plastic/rubber lines going to it and one two wire connector (sometimes the connector is red). Unplug the connector, remove the line that goes to the charcoal canister (the other line goes to the intake), start the engine and see if you can feel vacuum on the port on the Purge solenoid. If you can replace it.

Feb 09, 2012 | Cars & Trucks

1 Answer

What does code t0440 mean on a 2003 malibu


Do you mean "P0440"?

Diagnostic Test Code (DTC) P0440 has a generic description of "Evaporative Emissions System Large Leak".

The MOST COMMON cause of this code is refueling the vehicle with the engine running or not getting the fuel cap on correctly after refueling.

The Powertrain Control Module (PCM) checks for leaks in the Evaporative Emissions (EVAP) system using the data provided by the Fuel Tank Pressure (FTP) sensor. It will check the FTP sensor data, then close the EVAP Vent Valve and open the Canister Purge Valve to apply vacuum to the EVAP system. After a period of time, the PCM will again check the FTP data to see if the fuel tank pressure has dropped within a specified amount. If there is very little or no change in the FTP data, DTC P0440 sets.

Other possible causes for this code are:

> Defective FTP sensor (VERY RARE)
> EVAP Vent valve stuck open
> Canister Purge Valve stuck closed
> Large leaks or cracks in any of the EVAP system hoses and/or lines and/or components, including the fuel tank and the fuel filler neck and the EVAP canister

Please note that this code indicates a MECHANICAL failure of the system. This is NOT a circuit fault that would involve broken/shorted wires, blown fuses, etc..

Nov 12, 2011 | 2003 Chevrolet Malibu

1 Answer

P1441 evap system flow during nonpurge


CODE P1441 -- EVAP SYSTEM FLOW DURING NON PURGE CONDITIONS. POSSIBLE CAUSES. EVAP PURGE VALVE PIPE OR THE CHARCOAL CANISTER HAS A TEMPORARY BLOCKAGE. FTP SENSOR IS OUT OF CALIBRATION DAMAGED OR IT IS SKEWED. EVAP PURGE SOLENOID VALVE IS DAMAGED OR HAS FAILED. PCM HAS FAILED.

Jul 06, 2011 | 1996 Buick Roadmaster

2 Answers

Wont start and trouble code is p1441


P1441 Evaporative Emission System Flow During Non-Purge.


The vacuum system/Evaporative recovery system. Evap. (vapor cannister) code MAY be as a result of excessive fuel flow into the cylinders overloading the cannister's capacity. Possible cause is a failing Oxygen sensor giving a "Lean" indication to the engine computer, causing more fuel than is needed to be injected into the cylinders and captured by the vapor system. Trying to keep track of the changing readings may be taxing the computer's memory. Have the oxygen sensor checked. If it is functioning correctly, check for vacuum leaks, cracked or broken vacuum hoses.


Take you car to a professional as this is going to take some skill and knowledge to repair. Dont keep buying parts to fix the problem as this will get very expensive.


Here's a link to codes and what they mean http://autorepair.about.com/cs/troubleshooting/l/bl_obd_main.htm

Mar 13, 2011 | 1997 Pontiac Sunfire

1 Answer

I got a Error Code P1441 Definition EVAP System Flow During Non-Purge Conditions Possible Causes: EVAP purge valve, purge pipe, or the charcoal canister has a temporary blockage (this fault could...


P1442 usually gas cap. P1449 usually vent solenoid. P1441 usually always a faulty FTP sensor. Very problematic to Malibu, Grand Am Cavaliers and Aleros. That would be my first area to check. They are also known for poor wiring connections at the Left rear passthru connector to the fuel tank and vent solenoid, but not necessarily for that code.

Jan 25, 2011 | 2001 Pontiac Grand Am SE

1 Answer

Imisions test comes back with, code P1441 ?


P1441 is a EVAP code, small leak I thinking.

P1441 Evaporative Emission (EVAP) System Flow During Non-Purge

Now for the fix: the ECM uses a pressure sensor to watch the system and see that there are no leaks. If it sees a leak via the pressure sensor, it sets this code. The ECM wants to see the pressure sensor voltage drop down, indicating that there is vacuum on the system, and it wants it to be able to hold this vacuum for at least 30 seconds. If this does not happen, it will set a code. As a note, the vent solenoid is the most common failure on these systems.

Hope helps (remember to rate and comment this).

Sep 22, 2010 | 1996 Buick Riviera

1 Answer

Check engine code 1441 came on my '03 cavalier what is it?


Hope this helps,

Trouble Code: P1441 (2.2L L4 VIN F Auto)
EVAP System Flow During Non-Purge Print this code dataprint_icon_codes.gif
Number of Trips to Set Code: 2
OBD II Monitor Type: CCM Details
Indicators: MIL Details
Trouble Code Conditions:
DTC P0107, P0108, P0112, P0113, P0117, P0118, P0121-P0123, P0125, P0440, P0442, P0443, P0446, P0449, P0452, P0453, P1106, P1107, P1111, P1112, P1114, P1115, P1121 and P1122 not set, engine started, vehicle speed less than 75 mph, system voltage over 10.0v, ECT and IAT sensors from 39-86ºF and within 16ºF at startup, BARO sensor over 75 kPa, fuel level from 15-85%, PCM detected a continuous open purge flow condition with the fuel tank pressure decreasing to less than -11" H2O during the test. The PCM seals the EVAP system by commanding the EVAP Purge valve "off" and the EVAP Canister Vent valve "on". The PCM monitors the fuel tank pressure (FTP) sensor to detect if a vacuum is being drawn on the EVAP system. If vacuum in the EVAP system is more than a set value for a certain time, this code is set.

Possible Causes:
  • An improperly installed or damaged EVAP canister purge valve
  • A temporary blockage in the EVAP canister purge valve, purge pipe, or EVAP canister could cause an intermittent condition
  • FTP sensor is out-of-calibration, damaged or "skewed"
  • Purge solenoid valve is damaged or has failed
  • PCM has failed
  • TSB 02-06-04-046 contains a repair procedure for this code

Jan 19, 2010 | 2003 Chevrolet Cavalier

3 Answers

Where is the purge solenoid location on a 1996 Chevrolet silverado 1500 ???? trucks runs bad and I was told it was that or some other vacuum leak also I have code p0300 and p1441 if anyone can help...


A P0300 DTC is a misfire code. The P1441 is a no flow during purge code which has to do with the purge solenoid. With the misfire code present I would say you have a vacuum leak on one of the hoses. The purge solenoid is located in the passenger side, rear of the intake manifold.

May 09, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

96 Buick Century won't pass imisions code P1441


code is evap system flow during non-purge
check the hoses for holes or broken disconnected hoses also check the fuel cap emissions diagram under the hood will give u the location of the evep purge solenoid if all checks ok then replace the soienoid and clear the codes
rank & vote my solution

Dec 11, 2008 | 1996 Buick Century

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