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Car accelerating on its own when changing down from 4 to 3 whilst passing nuetral even with feet off all pedals. I have just got the first speeding ticket I have ever had in 46 years of driving,

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  • Bob Stevenson
    Bob Stevenson Feb 14, 2014

    Should be in the Car section and i am talking about a new Toledo

  • quinn lintorn-terry Feb 14, 2014

    if it is a new car take it back and ask the dealer to fix it. you should have warranty for it.

    what brand is the car? how old exactly is it, can you see if its a cable driven accelerator or an electrically controlled one? is it auto or manual?

  • Bob Stevenson
    Bob Stevenson Feb 14, 2014

    Seat Toledo 1.6 Tdi 6 months old electronic throttle. also fitted with stall protection and start stop electronics I have booked an inspection since this post and have been advised that the anti stall can cause the car to accelerate on changing down.

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Stall protection on cars should not be making the car accelerate above a given RPM range. unless you are changing from say 3rd to 5th and when the clutch is released the rpm drops to below idle RPM the car should not be accelerating. usually stall protection automatically applies throttle only to keep itself at 1000 rpm or just below. if its operating above 1000RPM take it into the dealership and tell them its not working properly. it could just be a small sensor recalibration needed

Posted on Feb 15, 2014

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  • Accelerator Pedal Position Sensor

    Description & Operation

    A power supply is applied on the Accelerator Pedal Position (APP) Sensor (main) power terminal from the PCM. The ground terminal is grounded with PCM. When the accelerator pedal is moved from the idle position to the fully opened position, the resistance between the accelerator pedal position sensor (main) output terminal and ground terminal will increase according to the depression.
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Testing

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  2. Turn the ignition switch to the ON position.
  3. Measure the voltage at the PCM terminal and ground with connectors connected:

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  4. If any check above does not meet the specifications, check connectors and wiring between the sensor and PCM. If ok, replace PCM.
  5. If the measured values are outside the standard value range, or if the load % and/or voltage does not change smoothly, replace the sensor.
  1. Connect a suitable scan tool to the diagnostic connector. Select APP1 or APP2 percentage.
  2. Turn the ignition switch to the ON position.
  3. Measure the voltage at the PCM terminal and ground with connectors connected:

    APP1 %-31.0-32.4% with the accelerator pedal releasedAPP1 %-69.8-81.8% with the accelerator pedal depressedAPP2 %-20.2-21.4% with the accelerator pedal releasedAPP2 %-58.8-70.8% with the accelerator pedal depressed
  4. If any check above does not meet the specifications, check connectors and wiring between the sensor and PCM. If ok, replace PCM.
  5. If the measured values are outside the standard value range, or if the load % does not change smoothly, replace the senso

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