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Thread: Very slow throtle response and now won't start

  1. #1
    'LS' Member
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    Very slow throtle response and now won't start

    Hi, this is my first post here. I didn't get much joy from "All Corsa Forum" and have now discovered this one. Hope there are a few more responses. PLEASE

    My Corsa 1.3 diesel tiptronic CDTi 2004 was running very poorly for a few weeks. It had developed a very slow throttle response. Especially bad from cold engine. But it started very easily even on cold mornings. Leave engine running for a few minutes but when I tried to drive it almost ignored accelerator pedal position. Several seconds delay and then it creept up to speed. After it did pick up speed it seemed OK, but if I stopped and then accelerated away it had the same slow response. Imagine pulling out into fast flowing traffic and then driving at 5 to 10 MPH for the first 200 yards. Cars behind me were not to happy and neither was I! When pulling away, the power was almost like a very badly slipping clutch but without the high revs.
    Has a new fuel filter and a new air filter. Took it for diagnostic check and fault code said air flow meter, so I replaced that (60) but still no change. New fault code said external air temperature sensor, strange fault but I have heard that back light bulbs can put the car in F mode so replaced it anyway. It made no difference. Fault codes cleared for 10 seconds and now a new fault code has sprung up, says glow plugs fault!...put in new glow plugs. Still no joy.
    Now the car wont even start.
    Paid Auto elecrician 60 to come and read diagnostics here is a list of faults..
    U2108-4 CAN-BUS No communication with ABS
    P0725-4 Engine speed signal CAN-BUS malfunction
    P1120-4 Accelerator pedal position signal CAN-BUS malfunction
    U2105-4 CAN-BUS No communication with ECM (engine control module)
    U2107-4 CAN-BUS No communication with Body control module
    P1722-0 Gear selector serial data
    P0110-8 Intake air temperature Signal Range / Performance
    Can any one translate any of that into English please? What is a CAN-BUS?

    There is fuel pumping through filter but not sure if it is getting as far as cylinders. Help please.Any suggestions?
    Thank you.

  2. #2
    'VXR' Member Taurus's Avatar
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    CANBUS is basically the system used to provide information from sensors to the ECU, and from control modules / switches to electronic items. In older cars for example a switch was hard-wired to a component. In a CANBUS vehicle the switch sends a message to control module, which then sends a signal down a shared loom which the item it relates to recognizes and operates. It saves massive looms on modern cars with lots of electronics.

    Reading your post my first thought was a throttle fault - it's fly by wire, basically two potentiometers, one on the throttle pedal and one on the throttle body. Usually when a problem occurs it's the one on the throttle pedal which goes first. (Usually, not always!)

    Looking at the range of faults listed - did he clear them before testing? I think they were from what you say, but my experience is that these have a have a habit of throwing a multitude of faults which are transitory and don't affect running, but they do leave codes in the system.

    If those are all current codes then I suspect you've got a control module problem - which will throw all sorts of codes, none of which are actually 'real', just that the faulty module is leading to them.

    I think I'd get a meter onto the throttle potentiometers and see what they're doing. You may get lucky and that's the problem. But if that checks out OK then you're into control module issues - and to be frank the 1.3 CDTi with the semi-auto transmission can be a nightmare to sort out. I know some workshops won't even consider taking them on. In which case set a limit what you're willing to spend getting it fixed and stick to it.
    Last edited by Taurus; 15-11-2013 at 05:00 PM.
    1972 Viva restoration thread - [url]https://www.thecorsa.co.uk/projects-builds/138-1972-vauxhall-viva.html#post1534[/url]

  3. #3
    'LS' Member
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    Hi Taurus, thank you for that. I will check those potentiometers and hope that is what is causing the problems. Do you you, or anybody else have any advice on them. I don't even know what they are or where they are or how to check them. I will google it but I prefer advice from a forum.

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    'VXR' Member Taurus's Avatar
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    A multimeter can be used to measure the output from them. If you're lucky it'll be the potentiometer on the throttle pedal - at the top end of the pedal arm. You can check anywhere on the loom up to the throttle body to save crawling about under the dashboard.
    1972 Viva restoration thread - [url]https://www.thecorsa.co.uk/projects-builds/138-1972-vauxhall-viva.html#post1534[/url]

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