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Thread: Speedo not working 16V 9A

  1. #1
    ⋆⋆ CF Member ⋆⋆ 123jamesrob's Avatar
    Join Date
    22nd November 2016
    Wrexham North Wales

    Speedo not working 16V 9A

    Hi guys,

    Having issues with my speedo not working, all my other gauges i.e fuel, rpm etc is working. I'm getting no speed on the needle and no MPG or distance. Good for the mileage not great for anything else

    I've up to now replaced the widget in the gearbox, the sensor on top of the gearbox, tested the plug to see if there is power getting to it upon the ignition being on, checked that the thing is spinning when in the gearbox, checked all the connnections at the back of the clocks, even changed the clocks to a different set to see if that would solve it, honestly at odds end with it. Any advice would be massively appreciated, cheers James.

    Oh, I noticed a post about the ISV affecting the speedometer, is this a possibility as mine is running rough at the minute and the ISV is my main culprit I think, I've got one on route a the minute hoping that will resolve the rough tick over.

    '92 Flash Red Corrado 2L 16V. First Corrado. Few mods, AP coilovers, Jetex exhaust, decat, momo steering wheel, audio upgrades, cams, chipped.

  2. #2
    ⋆⋆ CF Member ⋆⋆ vw rule's Avatar
    Join Date
    9th February 2013
    Hello there,

    the idle stabiliser valve (ISV) should vibrate / hum slightly when your engine is running, according to the Bentley manual for the 9A engine,
    If you think the (ISV) isn't working you can test it with a multimeter.

    ***(With 3 wire connector plug)***
    With the ignition switched on,
    you should have 12v from the centre terminal in the plug, and approx 10v from the two outer terminals.

    Also you can check to see if the (ISV) it's self has continuity or not, by checking the resistance between the centre terminal and each of the outer terminals,
    if you don't have any continuity then the (ISV) must be dead.

    **(With 2 wire connector plug)**
    With the ignition switched on,
    you should have 12v from terminal 2 in the connector plug, also you can check continuity between the 2 terminals on the (ISV) if you don't see any on your multimeter then the (ISV) is dead.

    The (ISV) and (Cold start valve) on the MK2 Golf 16v / Corrado 16v with engine code 9A looks like the fuse for it is number 15 = (10amp fuse)

    Multi function indicator is fuse 16 (15amp)

    Also I think the MFI uses a vacuum to measure the volume i.e the amount of cylinder capacity usage to determine MPG or something like that,
    I think there's a sensor on the back of the instrument cluster, where a vacuum hose is connected which then goes through bulkhead and connects to the brake servo hose, right on or next to the one way valve which is plumbed into brake servo pipe behind inlet manifold.
    If the vacuum hose isn't connected or split then you won't receive / see any MPG readings from your MFI.

    Most of the time it's the vehicle speed sensor (VSS) which is at fault, when your electronic speedo isn't working.
    This sensor is attached to gearbox above the differential and connects to the speedo gear.
    But you've said that you tried a different sensor and had no joy.
    And you said you've tried a different instrument cluster.

    Sounds to me like you're not getting a signal from the VSS wheather that's a wiring fault or faulty sensor.
    Just seems strange how you've tried different parts and it's still not working.
    In theory you should be able to unscrew the VSS with the connector plug still attached, and turn the spindle drive within sensor you should see the speedo move, other then that it'll be a wiring problem possibly.

    The VSS plug has 3 wires,

    If you've got power and earth then it's got to be the signal wire that's at fault ?

    I'll have a look at the Bentley manual tomorrow after work and see what I can find.

    Had MK2 1.8 Scirocco Scarla 1998 to 2002
    had it lowered on original wheels,
    K&N air fitler and Janspeed exhaust system.

    Now have 94 M reg Corrado 2.0 16v since 2002 still got it,
    been off the road now since early 2015
    hoping to get it finished this year.

    Also have a 2015 Seat Ibiza TSI i-tech as my daily driver.

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