Throttle Problem

Discussion in 'Fiat' started by kensteve, Apr 16, 2013.

  1. kensteve

    kensteve

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    Some help please.
    2010 Fiat Ducato Maxi 3.0 When i start engine it will not rev up but idles and misfires, if i turn it off and start again everything is normal. The Yellow ECU light is lit all the time had my local garage check the ECU. it reads "P0638 Throttle Control Valve". My local Fiat dealer does not have a clue when i phoned them. And cannot book it in till 13th May. Has anyone had this problem if so what is the solution ? Many Thanks Ken
     
  2. Mel

    Mel Funster

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    First thing change Fiat dealer.

    Are they a Fiat Professional dealer.
     
  3. Mel

    Mel Funster

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    I think from that code it should be strait forward for them.

    Mel
     
  4. kensteve

    kensteve

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    Yes they are a Fiat Professional Dealer.

    There are not that many around Gloucestershire :Angry:
     
  5. Mel

    Mel Funster

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    Do you have a Iveco dealer or is it the same dealer.

    The 3lt engine is Iveco
     
  6. Mel

    Mel Funster

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    You can phone freefone fiat famper and they will tel you what it is.
     
  7. tofo

    tofo Funster

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    Does it need a run to clear the catalyser

    Daughters vw beetle56 plate
    had a yellow light come on took it for a 15 mile thrash light went out

    Have you tried the fiat forum
    you may get a workshop fella on there give you a reply

    Probably the same answers as on here granted:thumb:


    Edit http://www.fiatforum.com/
    :thumb::thumb::thumb:
     
    Last edited: Apr 16, 2013
  8. Techno

    Techno Funster Life Member

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    Last edited: Apr 16, 2013
  9. jhorsf

    jhorsf Read Only Funster

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  10. kensteve

    kensteve

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    Contacted Camper Assistance they said they will come back to me, 2 days later nothing. Thanks Fiat :Sad:
     
  11. CHRI$

    CHRI$ Funster

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    OBD Code P0638refers to
    The Powertrain Control Module (PCM) compares the actual Throttle Possition (TP) with the target TP when the engine is running. If the difference is more than the specification, the PCM determines that there is a throttle actuator control circuit range/performance problem.
    Symptoms
    Possible sumptoms of OBD code P0638
    - Engine Light ON (or Service Engine Soon Warning Light)
    Causes
    Possible causes of OBD code P0638
    - Drive-by-wire control system malfunction - Throttle actuator malfunction - Throttle valve malfunction - PCM malfunction
     
  12. pappajohn

    pappajohn Funster Life Member

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    30 second google..... :RollEyes:



    Causes

    Possible causes of OBD code P0638
    - Drive-by-wire control system malfunction - Throttle actuator malfunction - Throttle valve malfunction - PCM malfunction

    My money is on the throttle actuator but could be any of the above faults or even some not listed.

    as already said....dump your fiat dealer.

    if they cant diagnose this fault then they aint worth bothering with......or they can but want to rip you off to the tune of £100 just to put the code reader on.

    try in independant/fiat franchised garage
     
  13. pappajohn

    pappajohn Funster Life Member

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    the throttle position can be recalibrated very easily.

    its usually just a slow throttle press from fully up to fully down and back again but you usually need access to the PCM to do it and i dont know how to access the program in the PCM on a fiat..
     
  14. chaser

    chaser Funster

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    Don't know about modern engines but years ago that would sound like heater plugs gone down
     
  15. motorhomelover

    motorhomelover

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    one wonders why they can not pin point problem if they are professional dealer
    with access to all the fiat data codes ?

    me thinks they may be trying to hide some thing here,..... may be their fully trained mechanic has left their employ and are up a creak with out the proverbial paddle :Sad: so gives you the we don`t know runaround
    get in touch with another dealer in next county
     
  16. andyman

    andyman Read Only Funster

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    The problem is a code reader will only give you a clue as to what the fault is. It could be a failed component or a bad connection.
    Easy to moan about the main dealer but if I read the OP correct it was not them who diagnosed the fault. If they sold you a new unit and the fault was still there, would you be happy if they would not give a refund on the part.

    Andy
     
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  17. pappajohn

    pappajohn Funster Life Member

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    the actual fiat wording for code P0638 is 'throttle valve command' which sounds like an electrical communication fault between the PCM and the throttle valve motor.

    could be something as simple as water from the front scuttle panel getting into the multi pin plug on the valve motor.

    nothing to lose but time removing the various plugs on the inlet tract and checking for contamination.
     
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  18. CHRI$

    CHRI$ Funster

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    i agree:thumb:
    had the same problem on my son's golf diesel,it would start but not rev,did a code read and throttle position sensor came up,after 2 hours getting the dam thing out from under the dash it was full of water,dried it out,sprayed some contact cleaner in it and running sweet again:thumb:
     
  19. kensteve

    kensteve

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    Fiat dealer confirms that Throttle Valve Body needs to be replaced. at a cost of £400 for the body which now make by a different manufacturer , £134 for wiring loom, & £3 for the gasket. plus 2 Hours labour. My Scout is over 3 years old and only done 5814 miles and has been serviced 4 times . But does the fact that the Throttle is made by a different manufacturer and a new loom is required mean the current one was" not fit for the purpose". So therefore should be replaced Free of charge ?.
     
  20. jhorsf

    jhorsf Read Only Funster

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    I would ask for a contribution towards the work from Fiat as this is a known problem to them
     
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