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Thread: 51 Vectra Z18XE - P1555 error, throttle position sensor?

  
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    51 Vectra Z18XE - P1555 error, throttle position sensor?

    My wife's car (seems to be contagious!) threw the emissions light on today, pedal test returns P1555 which is "Throttle position sensor, load signal, not plausible with engine load"

    Would it seem obvious that this is the throttle position sensor or could it be something else? Google suggests it can be down to a faulty/dirty throttle body but there's also mention of a faulty MAF?

    Would a TECH2 be of use here to help pinpoint the fault? Car is using petrol quite heavily at the moment.

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    poss ecu prob

    i think its the engine ecu at fault,it loses the 5volt feed to pedal,some1 at work has done a few after been to other garages and had pedals fitted

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    I hope it isn't ECU, it'd be more expensive than a new pedal!

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    all P1555 ive seen have just needed a damn good cleaning of the TB

    just use petrol instead of messing about with carb cleaner - so much more effective and of course cheaper

    of course the above suggestion is very plausible but at least whip the intake off to see the state of the TB

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    I've got a can of carb cleaner from when I gave mine a little clean, I've been doing a bit more Googling and loads of people have cleaned the TB with positive results so it can't do any harm, cheers Marti

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    Ahhh it must be P1555 that another member on here was referring to my throttle body.

    Said member suggested (IIRC) that my TB needed cleaning, except i'd taken it off the car & given it a damn good clean.
    They got back to me saying that possibly the electrical side of the TB may be a bit iffy/knackered/on its way sort of thing. Apparently it's common on this age of Astra 2000-2002 i think he gave (without checking my PM box), and it could only be sorted really with fitting a new one & having Tech2 on it.

    At 200+ for a new TB, i said beggar that & will just roll with it until it really goes haywire.


    Not saying this is your problem though

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    Given the car (Vectra) does 99% short runs, it'd not be surprising to find a mucky gunged up TB. When I looked at my TB on the Astra it was almost spotless yet it'd covered 140,000 without a TB clean...

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    Gave it a good squirt around with carb cleaner, made a right mess of a Costco microfibre cloth (cheers Marti!) in the process, started engine and no light on. Had a 20 mile trip up the motorway today and the light stayed off, so I guess it's a case of wait and see now!

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    Light came back on yesterday, pedal test is now returning two codes:

    P1555 - same as above
    P0115:

    P0115 Engine Coolant Temperature Circuit High Input C-11
    P0115 Engine Coolant Temperature Circuit Low Input C-11
    P0115 Engine coolant temperature circuit malfunction C-11

    I'm a tad lost as to what this could be? The coolant temp sensor was replaced last year though I recall reading that these are prone to fail? At a guess, this error is what is throwing up the P1555 one?

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    Something I finally found r.e. P0115

    "This is due to a known fault with the connectors at the coolant temp sensor plug which have been modified and can be retrofitted if you order the mod kit from Vauxhall."

    I've no clue if the garage fitted this with the CTS last year, I will try to find out if they can remember - at a guess they probably didn't. Seems it can be this, the coolant module itself (or wiring to it), worst case is a faulty ECU...

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