Question about 2006 Nissan Sentra

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Throttle body Just bought the throttle body sensor brand new and when did check engine light test said either vac leak bad electrical connection or or the throttle position sensor is bad. How likely is that to happen if the problem?

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Check the connections, you probably have an issue there. maybe a bent or broken pin. Also, why did you replace it in the first place - did you already have a problem?

Posted on Apr 01, 2014

Testimonial: "Well my wife took it in and had the check engine light tested because when on the freeway the car would jerk constantly then the test read that the throttle body sensor was faulty so I switched it out then all of a sudden the idol would fluctuate on its own"

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2 Answers

I have p 1121 and a P 0401 codes on my 1998 ford windstar. are these related? what can I check? replaced the mass airflow sensor recently.




P1121 Ford Throttle Position Sensor Inconsistent with Mass Air Flow Sensor
http://engine-codes.com/p0401_ford.html no they are not related !
Are there any cracks in the rubber hose from air cleaner to throttle body ! That could cause the P1121 air entering after mass air flow sensor !
P1121 - Throttle Position (TP) Sensor Inconsistent with MAF Sensor The PCM monitors a vehicle operation rationality check by comparing sensed throttle position to mass air flow readings. If during key ON engine running self-test the comparison of the TP sensor and MAF sensor readings are not consistent with calibrated load values, the test fails and a diagnostic trouble code is stored in continuous memory.
  • Air leak between MAF sensor and throttle body
  • TP sensor not seated properly
  • Damaged TP sensor
  • Damaged MAF sensor
Drive vehicle and exercise throttle and TP sensor in all gears. A TP PID (TP V PID) less than 4.82 % (0.24 volt) with a LOAD PID greater than 55% or a TP V PID greater than 49.05% (2.44 volts) with a LOAD PID less than 30% indicates a hard fault. P0401 - EGR Flow Insufficient Detected The EGR system is monitored during steady state driving conditions while the EGR is commanded on. The test fails when the signal from the DPF EGR sensor indicates that EGR flow is less than the desired minimum.
  • Vacuum supply
  • EGR valve stuck closed
  • EGR valve leaks vacuum
  • EGR flow path restricted
  • EGRVR circuit shorted to PWR
  • VREF open to D.P.F. EGR sensor
  • D.P.F. EGR sensor downstream hose off or plugged
  • EGRVR circuit open to PCM
  • VPWR open to EGRVR solenoid
  • D.P.F. EGR sensor hoses both off
  • D.P.F. EGR sensor hoses reversed
  • Damaged EGR orifice tube
  • Damaged EGRVR solenoid
  • Damaged PCM
Perform KOER self-test and look for DTC P1408 as an indication of a hard fault. If P1408 is not present, look for contamination, restrictions, leaks, and intermittents

Mar 09, 2015 | 1998 Ford Windstar

1 Answer

My 96 nissan altima dies at idle


Could be a dirty throttle body, vac leak, or a defective idle air control valve. The computer adjusts idle speed by controlling the amount of air entering the throttle body via the control valve.
Is the check engine light on ?

Dec 24, 2012 | 1996 Nissan Altima

1 Answer

I have a 1996 5.7 yukon that is spuddering while foot is in the gas at any speed. no check engine light. replaced plugs, wires, pvc, vac lines, fuel pump, fuel filter, fuel injector with new style...


It could be the timing chain or belt slipping from being worn out. Although another thought check to see if the throttle positioning sensor is bad. My truck did the same thing last year and replace TPS and runs like new. (mine didn't give chk eng light either)

Mar 31, 2012 | GMC Yukon Cars & Trucks

1 Answer

My service engine light is on. and I took it too autozone to be checked and got the results: Large vacuum leak on engine, 2. throttle body condition-dirty and faulty IAC valve/throttle. what does this...


These are all things that can affect your gas mileage and engine performance.

To check for vacuum leak, look for unhooked hoses on top of engine. If OK, use starter fluid and spray along intake manifold gaskets with engine running. If engine speeds up, there is a leaking gasket.

IAC deals with idle. Does the car idle smoothly? If not, remove IAC to see if it's dirty. I will paste instructions below for the IAC valve.

Throttle body dirty--what code is this? never heard of such a code, but you can clean the throttle body wioth carb cleaner. I will paste instructions below.

IAC valve info:


Operation The amount of air taken in during idling is regulated by the opening and closing of the servo valve located in the air passage that bypasses the throttle valve. The servo valve is opened or closed by the activation of the stepper motor (incorporated within the idle air control motor in the forward or reverse direction. Battery positive voltage is supplied, by way of the MFI relay, to the coil of the stepper motor. The engine control module switches ON the power transistors (located within the engine control module) in sequential order, and, when current flows to the stepper motor coil, the stepper motor is activated in the forward or reverse direction.


Removal & Installation

  1. Disconnect the negative battery cable.
  2. Detach the electrical connector at the sensor.
  3. Remove the sensor from the throttle body.
To install:
  1. Install the sensor in the opening in the throttle body and tighten the sensor.
  2. Attach the electrical connector to the sensor.
  3. Connect the negative battery cable.


Testing
Checking Coil Resistance

  1. Disconnect the idle air control motor connector and connect the jumper (test harness).
  2. Measure the resistance between terminal (2) of the connector at the idle air control motor side and terminal (1) or terminal (3). Standard value: 28-33 ohms at 68°F
  3. Measure the resistance between terminal (5) of the connector at the idle air control motor side and terminal (6) or terminal (4). Standard value: 28-33 ohms at 68°F
  4. If not within specifications, replace the IAC Valve.
  5. If within specifications, check connectors and wiring between the sensor and ECM/PCM.
Checking Operation Sound
  1. Check that the operating sound of the stepper motor can be heard over the idle air control motor when the ignition switch is turned to the ON position (without starting the engine).
  2. If no operating sound can be heard, check the stepper motor drive circuit. (If the circuit is good, a defective stepper motor or engine control module is suspected.)

      0029f4e.gif
    IAC picture--mounted on top side of engine.
      Throttle body--loosten clamp to right of throttle body and pull hose off. Use electric parts cleaner or carb cleaner--spray on dirt with engine running. don't touch any sensors inside throttle body--sensors are delicate.
    b9362af.gif

    Oct 11, 2010 | 2005 Mitsubishi Endeavor

    1 Answer

    Misfire/boggin down/shaking


    If you cleaned the mass air flow sensor (MAF) and your still getiing the problem. You may have to replace it. But before you go there. Strat the car and listen for a lond hissing sound by the throttle body area. If you hear it you have find it .You can hunt down a vacuum leak with a propane tester and watch a tach gauge for for increase RPM's when leak is detected.
    Ignition system checks are a little tricky and time consuming. Its easier to use a scopemeter and look for the bad cylinder.
    What I believe is you need a new MAF its presenting a rich condition
    condition and its being reported as a bad air /fuel ratio.
    A rich condition could lead to misfiring.
    use the shop manual to conduct the electrical tests needed on the MAF.
    If it fail any of them reolace it . Good luck and keep me posted

    Mar 13, 2010 | 2000 Toyota Sienna

    1 Answer

    For Focus Check Engine Light P2004


    CODE P2004 INTAKE AIR SYSTEM MALFUNCTION. POSSIBLE CAUSE.TEST FOR STICKING ACCELERATOR OR SPEED CONTROL CABLE TURN OFF KEY AND DISCONNECT ACCELERATOR AND SPEED CONTROL CABLE FROM THROTTLE BODY.ROTATE THE THROTTLE BODY LINKAGE TO DETERMINE.IF IT ROTATE FREELY.THE THROTTLE BODY MAY HAVE FAILED.CHECK AIR CLEANER AND AIR INLET ASSEMBLY FOR RESTRICTIONS.CHECK THE IAC MOTOR RESPONSE.IT MAY BE DAMAGED OR STICKING.CHECK PVC SYSTEM VALVE AND HOSES FOR LEAKS AND PLUGGING.CHECK FOR SIGNS OF VACUUM LEAKS IN THE ENGINE OR COMPONENTS. TEST TP SENSOR SIGNAL DUE A SWEEP TEST AT KEY ON ENGINE OFF.

    Sep 19, 2009 | 2000 Ford Focus

    1 Answer

    Engine doen't stay idle at steady rpms rev up and down by itself


    Either you have a vacuum leak, a bad throttle body position sensor, or a bad throttle body.

    If the throttle body is drive by wire (electronic) then it would be a bad throttle body.

    If the throttle body is drive by cable (manually driven by a cable connected to the gas peddle) then it would be a bad throttle position sensor.

    If the throttle body is bad the check engine light wil lbe on. If it is on have your codes read at your local parts dealer for free, and this will give you a clue as to which pices/parts you need to replace.

    Have the car leak tested and the vacuum linse inspected for leaks as well.

    Jun 01, 2009 | 1989 Toyota Camry

    2 Answers

    2000 ford escort zx2 bank 1 running lean


    Check for a vac leak straight off the back of the throttle body. If you can't find any vac leaks, clean the MAF

    Mar 01, 2009 | 2000 Ford Escort

    2 Answers

    Check engine light on,idols rough,fine at all other speeds.


    It either has a vacuum leak or a dirty MAF. To test for vac leaks spray the engine with carb cleaner to see if the engine speed changes., if it does you fond the leak. The most common leak is pcv line coming straight off the back of the throttle body. Check there first. Also check to make sure there are no air leaks between the throttle body and the mass air flow. Don't replace the idle speed motor or the tps, they won't fix it. It is possible the o2 is the problem, but it usually isn't. P0107 Is usually always from the stuff i listed above.

    Mar 01, 2009 | 2000 Ford Escort

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