Question about 1998 Pontiac Grand Prix

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Error codes P0507 and P0102 after replacing MAF sensor

Got an error code for MAF sensor, replaced it. Next day had trouble starting car, keeping it running. Idles rough. SES light came on that day and shows P0507 and P0102 now. It runs better than before replacing the sensor, but still not right.

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  • Aimee Maggart
    Aimee Maggart Dec 10, 2013

    Always starts up when cold. It's only when starting a warm engine that it won't stay running.

  • Aimee Maggart
    Aimee Maggart Dec 11, 2013

    We reset the computer and changed the air filter, which was BLACK. Still have problems starting car when engine is warm. Idles rough all the time and acts like it wants to die,

  • Aimee Maggart
    Aimee Maggart May 31, 2014

    Turns out it was the after market MAF sensor. We finally bought a gm sensor and it fixed it all RIGHT AWAY. UGH. wish I would have done that 6 months ago.

  • Aimee Maggart
    Aimee Maggart May 31, 2014

    We finally got it fixed. It turns out the after market MAF sensor was the problem. We replaced it with a GM MAF sensor and all problems were solved.

  • Aimee Maggart
    Aimee Maggart May 31, 2014

    Just for fun, switched back to the aftermarket part and it ran bad again. So, go with the GM PART, save some headaches.

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P0102: you need to make sure the sensor is clean; sometimes it get dirty as you are working on an old car. Check the voltage manually. Make sure there is no air leak near it

P0507: high idle... this sounds like a vacuum leak. get starter fluid and start the car. Spray around and check for change in car idle

Posted on Dec 09, 2013

Testimonial: "We did check for air leaks and none were found. Where do you spray the starter fluid?"

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MNfisherman

Nate Stansfield

  • 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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skychief2001

Stephen

  • 21873 Answers

SOURCE: Why is my Grand Prix surging/stalling when ideling?

If you did not disconnect the battery and drain the voltage from the ECM, it could be using old settings when the problem existed.
When a problem occurs, the computer tries to correct it or find new settings to work around the problem. When you fix a problem you have to clear the codes and sometimes erase the memory from the computer to allow it to start back at the factory settings.
When you disconnect something and the check engine light comes on, the computer goes into limp mode and uses values for the sensors preset by the factory. The car will almost always run rich to ensure the driver can get back to a place for repairs.

Posted on Aug 25, 2012

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2007 maxima,code: p0507,p0113 ,p0102. what is next step should i do ? need new MAF ?


code p 0507 refers to idle speed control (ISC) system---higher than expected===causes --wiring --ISC actuator/IAC valve---throttle motor---throttle valve tight sticking---ECM

code p 0113 refers to intake air temperature (IAT) sensor--circuit malfunction===causes --wiring open circuit/short to positive ---wiring short to ground ---ground wire defective---IAT sensor ---ECM

code p 0102 refers to mass air flow (MAF) sensor / volume air flow (VAF) sensor --low input====causes --wiring short to ground --MAF/VAF sensor---ECM
you should take it to an accredited service center that has experience on you make of car or you could be wasting money replacing what isn't broke
simple testing will show the faulty item

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code p0102 refers to mass air flow (MAF) / volume air flow(VAF sensor-- low input===causes --wiring short to ground---MAF/VAF sensors---ECM
I would replace the MAFor VAF sensor after having each one tested to find the faulty unit.

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Error code P0102 MAF


sounds about right. you can try cleaning it with maf sensor cleaner first. if that doesnt work then replace it. do not touch the element with anything but the cleaner.

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I'm getting error code P0102 which points to the MAF sensor. The car has no power one second and it works fine the next. It almost sounds like fuel is not getting through. Could it be the fuel filter?...


have a repair shop check out the MAF sensor signal. If they determine that its bad, get them to replace it. If that doesn't fix it, then its their problem, not yours. If you buy one and install it, and it doesn't fix it, your not getting your money back.

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P0102 and p1676 code active after replacing intake manifold gasket. replaced m.a.f but codes are both still active, voltage is good at maf and pins are tight. any suggestions?


IF YOU REPLACED MAF SENSOR YOU NEED A CODE SCANNER TO ERASE THE TROUBLE CODE.MAKE SURE MAF SENSOR ELECTRICAL CONNECTOR SEAT IN PLACE GOOD.

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I have a ford taurus 02' diagnostic code p0102..wat s wrong


P0102 OBD-II Trouble Code - Mass Air Flow (MAF) Circuit Low Input

What does that mean?
Basically this means that there is a problem with the Mass Air Flow (MAF) sensor or circuit. A more technical description would be that the MAF circuit had lower than expected voltage (air flow). Other MAF sensor circuit DTC trouble codes are P0100, P0101, P0103, and P0104.

Symptoms
You will likely not notice any serious drivability problems, although there may be symptoms such as a general decrease in power or sluggishness.

Causes
A code P0102 may mean that one or more of the following has happened:
* The MAF may be disconnected, or a wiring connection may be bad
* The MAF may be dirty or otherwise contaminated (Note: if you use a reusable oiled air filter, be careful not to apply too much oil or that can contaminate the MAF).
* The MAF sensor may be faulty
* The vehicle computer may be faulty (very rare)

Possible Solutions
The simplest thing to do is to reset the code and see if it comes back. Then start with the cheapest, easiest repair procedures:
* Verify that the Mass Air Flow Sensor wiring is connected properly and that there are no broken / frayed wires.
* Inspect for any air leaks near the MAF sensor.
* Take the MAF out and clean it using a spray cleaner such as brake cleaner or electrical contact cleaner. Be gentle with the sensor.
* Check the voltage of the MAF sensor (refer to a repair manual for vehicle specific information)
* Replace the MAF sensor.

Hope help with this (remember rated this post).

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P0716 - Input Speed Sensor Circuit Intermittent, this is a problem with the VSS, vehicle speed sensor, replace it.
Clear all the codes after above repairs and drive a few days, then retest system for codes.

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