Hi, I'm Eric from Baltimore. I have Mercedes C180S. Sometimes my MB C180 speedometer doesn't work. It works mainly when they are at a speed of 60 or 70, but not at a speed below 60. Any suggestions? What could it be? and How can I fix it?
Answer:
Hello! This is a very common problem for German vehicles!
I have often seen what you describe. The speedometer does not work or is defective. It is more than likely that the speedometer is defective. It's not the speed sensor because it can't cause these problems. It works like this.
The speedometer works electrically (I don't mean digital!) Therefore, there is nothing to put on weight in the speedometer system, since everything is electronic components. This means that there is no cable to break the speedometer!
You must first check if there is a sufficient signal from the speed sensor. To measure the signal, it is necessary to automatically connect and measure the cable and check the AC voltage. It will be small and will go up and down with the speed of the vehicle. A good square wave in a telescope.
If no signal is present, the speed sensor must be replaced. Otherwise, go to the speedometer.
The main chip integrated into the tachograph card is probably defective, which leads to incorrect speedometer / odometer operation or operation without a speedometer / odometer.
The problem cannot be solved. You need to get a new or used speedometer! !
I hope this helps. Good luck.
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