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MattKing

Finding my way
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Posts posted by MattKing

  1. 10 minutes ago, KevC_Derby said:

     

    I think you mean a higher current.

    The contamination is more likely to be on the Connections and not the Contacts.

    There is a difference between a Switch and a Sensor, a Sensor will be variable analogue output and the output will be monitored (4-20mA or 0.5-4.5v) and parameters will be set to determine position.

    The Switch or Sensor will be sealed to at least IP65, submerging it won’t help the internals.

    VAG ECU inputs have a whetting current that ensures a current larger than the minimum recommended switch rating is passed through the Switch.

    I’d also guess that this is a SiL2 rated assembly and replacing the Switch or Sensor outside of an assembly line with verification equipment cannot guarantee the Safety Integrity Level of the repaired assembly.

    Some of you points are correct, some maybe correct and some irrelevant. 

     

    Regarding the last point on functional safety, I don't give a monkeys. If I repair it and put it back in and it works, who cares? 

  2. 1 hour ago, MoggyTech said:

    The failure is due to what VW call silicate build up in the micro-switch for the park position. So basically corrosion, that causes a resistance that confuses the mechatronics unit and or ECU.

    The ECU will be expecting either a fully open or dead short from the switch depending on the gear selector position. i'm not sure if the switch signal path goes through the can-bus, but in any case, any deviation from the expected voltage (switch position dependant)

    will confuse the control modules, thus causing the error. 

     

    I used to see this kind of fault when I serviced video recorders, that used a mode select switch to determine the position of the mechanical parts (play, stop, record, fast forward etc.)

    Of course the switch could be got at and replaced, unlike all this modular nonsense crammed into cars these days.

    If this indeed the failure mode its common with microswitches. I'm an engineer who works with sensors that use microswitches. One fix that will stop the problem for a while is to put a much higher voltage through and operate the switch. This burns the contaminated off the contacts. It is sometimes permanent but normally returns. If you can get the switch off it can be replaced or you can put it in an ultrasonic bath with IP Alcohol.

    • Thanks 1
  3. 13 minutes ago, SashaGrace said:

    If you want to know the part number, it’s in the settings under system information. If you want to know the name of the system, if it doesn’t have sat nav, it’s a Bolero, if it does have sat nav and it has a smaller screen (5.8 or 6.5 inches on the PFL) it’s an Amundsen. If it has nav and a larger screen (8 inches  on the PFL) it’s a Columbus. On the FL, the Amundsen has an 8 inch screen with swivel wheels on it, the Columbus has a 9.2 inch screen with no swivel wheels, just some touch buttons on the left.

    Thanks for the quick response! I'm going to go and try and work it out. It's got Sat nav but not sure what size screen. 

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