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Thread: No throttle response

  1. #1
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    Vehicle : Vauxhall

    Trim : Vectra C

    Engine : 1.9 CDTI

    Year : 2006

    Default No throttle response

    Good evening gents and any laides present,

    Newbie to the site and looking for any available assistance for a problem with my 2006 1.9cdti 8v vectra C, a problem which has lamost got me defeated.

    Having issues with no throttle response and self revving at around 13k revs, I changed the throttle body few months ago, however, the problem has re-occured. RAC read the following fault codes:

    P0340, Camshaft position sensor
    P0641, 5V reference circuit 1
    P1125, Throttle Actuator feedback circuit
    P0638, Electronic throttle control
    P0105, Boost pressure sensor
    P0110, IAT

    I have seen this issue is very common on forums, but never really find anyone getting to the bottom of it? Hoping someone may have solved this and can shed some light on it, also hoping someone could pass on or inform myself where I can locate the wiring diagrams for this motor so I can check earth points, confirm if the above sensors are all on the one circuit and maybe help me trace this 5v reference circuit problem.

    Any advice or diagrams will be greatfully appreciated.

    Scott

    P.S I have checked the resistance in the above sensors and seem ok, physicaly checked the wiring and no sign off damage, I have also had the ECU tested at BBA and there is no fualt with this apparantley.

  2. #2
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    I would look at the circuit diagram and see if the 5v reference feeds all of the sensors first. If they do then I'd remove all of those sensors, measure the 5v signal and then plug on each sensor one by one until the 5v voltage level drops. I'd remove that sensor and then add the others to check that the 5v level remains. You've then narrowed that down to the sensor that is causing a partial short causing the 5v voltage drop that would in turn give the fault code errors on all of the sensors.

    Testing the ecu on its own on the bench the ecu testing place would check for the 5v level but not necessarily under load with the sensors in place.

    I would hazard a guess that it would possibly be the:

    "P1125, Throttle Actuator feedback circuit"

    as this is a typical voltage potentiometer circuit that is a 'wiper' over a resistor and is a physical wearable item. Note I'm not saying this is the actual fault, as I haven't diagnosed your car or seen it.

    Good luck with it.
    Last edited by NickT; 9th August 2018 at 22:49.

  3. #3
    Regular Member rmsNoel's Avatar
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    Vehicle : vectra Cdti

    Trim : design+

    Engine : cdti 120

    Year : 2005

    Mileage : 51,321

    Default

    Is this like the one where the solder comes away from the board on throttle body and causes all sorts of chaos

  4. #4
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    Vehicle : Vauxhall

    Trim : Vectra C

    Engine : 1.9 CDTI

    Year : 2006

    Default

    Quote Originally Posted by NickT View Post
    I would look at the circuit diagram and see if the 5v reference feeds all of the sensors first. If they do then I'd remove all of those sensors, measure the 5v signal and then plug on each sensor one by one until the 5v voltage level drops. I'd remove that sensor and then add the others to check that the 5v level remains. You've then narrowed that down to the sensor that is causing a partial short causing the 5v voltage drop that would in turn give the fault code errors on all of the sensors.

    Testing the ecu on its own on the bench the ecu testing place would check for the 5v level but not necessarily under load with the sensors in place.

    I would hazard a guess that it would possibly be the:

    "P1125, Throttle Actuator feedback circuit"

    as this is a typical voltage potentiometer circuit that is a 'wiper' over a resistor and is a physical wearable item. Note I'm not saying this is the actual fault, as I haven't diagnosed your car or seen it.

    Good luck with it.
    Hey Nic thanks for the reply, should have the ECU back today and will carry out the above checks, only drama I am facing, and hoping someone on here could assist with, is getting a hold of the schematics. I have hunted the web to no luck, Haynes doesnt show the power distribution that I require.

    I was reading last night of a fella with an astra and had similiar symptoms, there was a mention that the pedal wiring went from acc pedal to ECU via UEC, which is prone to water ingress, corrosion etc, and can cause a continuity problem, I had the UEC off the other day, however, it looked ok, but I didnt clean it so will try that too.

    If it is was to be the 'Throttle Actuator feedback circuit' I will be pretty P'd off as I have changed the throttle body for a brand new part.

  5. #5
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    Vehicle : Vauxhall

    Trim : Vectra C

    Engine : 1.9 CDTI

    Year : 2006

    Default

    Quote Originally Posted by rmsNoel View Post
    Is this like the one where the solder comes away from the board on throttle body and causes all sorts of chaos
    Hey rmsNoel, Ye apparantley that can be a fix, but wasnt in my case. I went as far as removing the old solder joints completley and putting new
    on, but the porblem was still there so replaced the unit, which I thought had done the trick until it re-appeared a couple weeks ago.

  6. #6
    Midlands - Head case Organiser Dog_Book's Avatar
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    Vehicle : Vectra Estate

    Trim : VXR

    Engine : Z28NEH

    Year : 07

    Default

    Quote Originally Posted by scottyw83 View Post
    Hey Nic thanks for the reply, should have the ECU back today and will carry out the above checks, only drama I am facing, and hoping someone on here could assist with, is getting a hold of the schematics. I have hunted the web to no luck, Haynes doesnt show the power distribution that I require.

    I was reading last night of a fella with an astra and had similiar symptoms, there was a mention that the pedal wiring went from acc pedal to ECU via UEC, which is prone to water ingress, corrosion etc, and can cause a continuity problem, I had the UEC off the other day, however, it looked ok, but I didnt clean it so will try that too.

    If it is was to be the 'Throttle Actuator feedback circuit' I will be pretty P'd off as I have changed the throttle body for a brand new part.
    The TB does not control engine speed so could be leading you down the wrong path, this might be a worn track on the throttle pedal. Could try getting a used one and replacing it see if it works?
    I don’t even know why the TB has so much electronics in it all it does is close on shutdown then open back up
    Vectra VXR estate 2007 Sapphire Black
    Teapot Tuned 245/300
    Eibachs B8's, fully loaded factory options

    https://www.vectra-c.com/forum/calendar.php

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