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  1. G

    Gen 2 Yellowbox calibrator

    Thanks. Tested everything as you described and this is what I found: the positive and grund gives 13v when the car is running, so no problems there. I did put the jumper on and the speedo worked as normal. No issues with the speed signal in other words. Could it be a non working yellowbox? I...
  2. G

    Gen 2 Yellowbox calibrator

    Just tested the black and blue ground pin nr 4 but it isn’t grounded to the chassi. It is ”sensor ground”. Is this OK for ground or should it be a constant grounded wire? Like pin nr 31 and 32 that are grunded to chassi?
  3. G

    Gen 2 Yellowbox calibrator

    I used pin 2 and pin 4 without succes. Do you know if pin 28, speed sensor, is correct or should I use nr 27, speedometer signal?
  4. G

    Gen 2 Yellowbox calibrator

    Hi The speedo on my 1999 GTS need to be calibrated due to bigger wheels and different gearing. I just got my yellow box and tried to install it without succes. I was following the instruction and those are the problems I run into: 1. In the harness leading to the black PCM connector, I was...
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