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Thread: Tps short ,

  1. #1
    ianturbo's Avatar

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    Tps short ,

    Hi all ,Zeddy found tps short ,I've stripped the wires back as far as the main loom ,no breaks in the wires to the plug , any ideas were it goes to after here or were abouts to look next ,
    Many thanks Ian



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    Last edited by Humpty's Revenge; 03-11-2021 at 04:32 PM. Reason: Yet another thread started that has to be moved to the correct area !!!!

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    You've just got to keep going until you find the break/short.

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    Quote Originally Posted by Confused View Post
    You've just got to keep going until you find the break/short.
    Do they go to the ecu or the gearbox ecu ? I have 5volts to the feed so it isn't that one ,I'm thinking of just re wire to were ever they go to ,

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    The signal wire goes (eventually) to engine ECU, gearbox ECU, and AYC ECU.

    It usually splits off inside the car - however as you're having failed with all of them, I'd say it's probably in the engine bay area.
    @elnevio had a fun intermittent wiring fault on his car, where it goes through the inner arch, if I remember correctly, the support bracket that holds the loom to the gearbox wasn't reattached properly, which allowed the loom to move and chafe.

  5. #5
    ianturbo's Avatar

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    Quote Originally Posted by Confused View Post
    The signal wire goes (eventually) to engine ECU, gearbox ECU, and AYC ECU.

    It usually splits off inside the car - however as you're having failed with all of them, I'd say it's probably in the engine bay area.
    @elnevio had a fun intermittent wiring fault on his car, where it goes through the inner arch, if I remember correctly, the support bracket that holds the loom to the gearbox wasn't reattached properly, which allowed the loom to move and chafe.
    Thank you , its my daily driver and when it plays up it can't make its mind what gear to be in ,

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    Where the loom from the fuse box goes through the inner wing, there is a large oval grommet with plastic tabs. On mine, one of the tabs was bent the wrong way, so had been exerting pressure on the loom, eventually wearing through the covering and the insulation.

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  7. #7
    ianturbo's Avatar

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    Quote Originally Posted by elnevio View Post
    Where the loom from the fuse box goes through the inner wing, there is a large oval grommet with plastic tabs. On mine, one of the tabs was bent the wrong way, so had been exerting pressure on the loom, eventually wearing through the covering and the insulation.

    20211103_183505.jpg
    Cheers I'll strip it all down and have a look ,

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    when you testing the wiring are you checking %v to battery ground/chassis gnd or are you check to sensor gnd.
    if you check to battery gnd and 5 V ok then check to the sensor Gnd and 5v is not at the connector you know there is an issue with the sensor gnd.but if you still get the 5V present then the sensor ground wire should be OK.
    and it can only be one of the other 2wires.

    for the next bit you need to know the control type on the TPS sensor. Then back probe the sensor connector wires and you can probably check the wire with nothing more than test light.
    this will allow you to apply a gnd or 5V to the other two wires and use evoscan to to see if the throttle position changes in eveoscan.
    but you have to know if applying a Gnd and %v is ok for the ecu circuit or not which why you need to know the type of circuit control in the ECU.

    this should be what you have for the TPS.
    this wiring diagram is for the uk spec galant but the TPS should be the same.

    Capture.JPG

    you need to measure the following with the TPS sensor fitted in place.
    Pin function

    pin 1 5V sensor supply
    pin 2 TPS output to ECU Voltage between 0-5V changes with TPS movement.
    pin 3 Voltage between 0-5V
    pin 4 sensor gnd

    measure voltage between:-

    red lead black lead

    pin 1 to battery gnd
    pin 1 to pin 4
    pin 3 to battery gnd
    pin 3 to pin 4
    pin 2 to battery gnd
    pin 2 to pin 4

    the result of these measurements will tell mw which wire is broken and how easy it will be to fix it.
    Last edited by Davezj; 04-11-2021 at 02:08 AM.

    Bye for Now!

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    Quote Originally Posted by Davezj View Post
    when you testing the wiring are you checking %v to battery ground/chassis gnd or are you check to sensor gnd.
    if you check to battery gnd and 5 V ok then check to the sensor Gnd and 5v is not at the connector you know there is an issue with the sensor gnd.but if you still get the 5V present then the sensor ground wire should be OK.
    and it can only be one of the other 2wires.

    for the next bit you need to know the control type on the TPS sensor. Then back probe the sensor connector wires and you can probably check the wire with nothing more than test light.
    this will allow you to apply a gnd or 5V to the other two wires and use evoscan to to see if the throttle position changes in eveoscan.
    but you have to know if applying a Gnd and %v is ok for the ecu circuit or not which why you need to know the type of circuit control in the ECU.
    Dave if i think it would make it to yours I'd nip over for you to have a look , sadly I'm lucky to nip into town and back

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  10. #10
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    I might be able to come up at some point to have a look, but i have a sticking rear calliper at the moment so i will have to sort that out first.

    do you have off road parking or a garage that the car can be put in.
    this would maximise the opportunity for me to pop up and take a look one evening.

    depending if the wire break can be found or not, it might be easier to replace the wire from the ecu to the TPS sensor, but that means getting to the back the centre consul area to get to the ECU.

  11. #11
    ianturbo's Avatar

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    Quote Originally Posted by Davezj View Post
    I might be able to come up at some point to have a look, but i have a sticking rear calliper at the moment so i will have to sort that out first.

    do you have off road parking or a garage that the car can be put in.
    this would maximise the opportunity for me to pop up and take a look one evening.

    depending if the wire break can be found or not, it might be easier to replace the wire from the ecu to the TPS sensor, but that means getting to the back the centre consul area to get to the ECU.
    Hi Dave I don't have a garage, to be honest I'm getting p#@sed off with it , just went to get my newspaper and i had to drive in reverse to get it back home , it wouldn't drive in any mode ,

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  12. #12
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    what difference does it make driving forwards or backwards?
    the throttle opens the same way and the TPS works in the same way if you are going backward or forwards the only part that makes the car go in a different direction is the Gerabox.

    are you saying there is something working with the gear box which does not allow it to go forwards.

  13. #13
    ianturbo's Avatar

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    Quote Originally Posted by Davezj View Post
    what difference does it make driving forwards or backwards?
    the throttle opens the same way and the TPS works in the same way if you are going backward or forwards the only part that makes the car go in a different direction is the Gerabox.

    are you saying there is something working with the gear box which does not allow it to go forwards.
    It went up the hill in reverse, it wouldn't go up in 1st in auto or trip mode? I did another flashing dash tonight and got 14 on the gearbox and 14 on the engine, both tps faults, its bonfire night tomorrow

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  14. #14
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    It is still pointing to the tps not being adjusted correctly.
    Probably not seeing the idle position of the TPS correctly.
    When the TPS is closed the idle position out should be active. And as soon as you crack the throttle open slightly the idle position out should deactivate. This is what you are setting up with the feeler gauge.

    As your car is an auto you have an TPS (throttle position sensor) and an APS (accelerator position sensor).
    Both of which have to be setup correctly.

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    ianturbo's Avatar

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    Quote Originally Posted by Davezj View Post
    It is still pointing to the tps not being adjusted correctly.
    Probably not seeing the idle position of the TPS correctly.
    When the TPS is closed the idle position out should be active. And as soon as you crack the throttle open slightly the idle position out should deactivate. This is what you are setting up with the feeler gauge.

    As your car is an auto you have an TPS (throttle position sensor) and an APS (accelerator position sensor).
    Both of which have to be setup correctly.
    Ive got a throttle body to try off Zeddy

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    Which sensor where you adjusting.
    The TPS on the back of the throttle body or the aps on the front of the throttle body.
    Least I think it is that way round the one with the idle switch is the 4 wire sensor.

    It will be good to see if the throttle fixed you issue.
    It will make you happy to get you far back up and running.

  17. #17
    ianturbo's Avatar

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    Quote Originally Posted by Davezj View Post
    Which sensor where you adjusting.
    The TPS on the back of the throttle body or the aps on the front of the throttle body.
    Least I think it is that way round the one with the idle switch is the 4 wire sensor.

    It will be good to see if the throttle fixed you issue.
    It will make you happy to get you far back up and running.
    I got it running, all was fine till i came to go home , now the immobiliser has kicked in and it wont start , been told it "could " be tge 10 amp fuse to it

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  18. #18
    ianturbo's Avatar

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    Quote Originally Posted by ianturbo View Post
    I got it running, all was fine till i came to go home , now the immobiliser has kicked in and it wont start , been told it "could " be tge 10 amp fuse to it

    Sent from my SM-G780F using Tapatalk
    There is only the tps front one on mine ,I've spent 60 quid on sensors even after following videos off people on here it wasn't for working,

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    Hmmm does not sound good.
    So you got a known working throttle body from Mo.
    Fitted this, the TPS started to work, and now it is not working again.
    Then the immobiliser kicked in and you can't start the car.
    Is that right?

  20. #20
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    Quote Originally Posted by Davezj View Post
    Hmmm does not sound good.
    So you got a known working throttle body from Mo.
    Fitted this, the TPS started to work, and now it is not working again.
    Then the immobiliser kicked in and you can't start the car.
    Is that right?
    Its running now , but I'm not sure its right, ( to be honest I'm starting to lose faith in it ) Mot Friday, I'll see what happens then

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