Michele Z - Mercedes-Benz Forum

 
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post #1 of 5 (permalink) Old 04-14-2012, 06:29 PM Thread Starter
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Michele Z

Hi everyone, I have a 1999 E320 Sedan, I've had it for 6yrs now. Never had any real problems with my benz, but recently I had to change my water pump and the thermastat. Now I got a error code P0115, which is the coolant temperature sensor. Checked the sensor and found that it was not connected, now my fan is constantly running when the engine is on and the temperature gauge is not moving, do anyone know what can cause this?

Michele Z.
Wisconsin
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post #2 of 5 (permalink) Old 04-14-2012, 07:51 PM
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post #3 of 5 (permalink) Old 04-14-2012, 08:50 PM
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I got a error code P0115, which is the coolant temperature sensor. Checked the sensor and found that it was not connected,
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post #4 of 5 (permalink) Old 04-14-2012, 11:47 PM
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Lightbulb

There have been several cases of this that have found either the fan control unit, or the m.e. control unit to be the culprit. The way to differentiate this, is to remove the signal wire from the fan control unit (without removing its power & ground) to see if the fan is continuing to run. If so, it's time for a new fan. If not, then you should check signal voltage output from the m.e. control unit. If signal voltage is constant, then the m.e. is to blame.
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post #5 of 5 (permalink) Old 04-15-2012, 04:44 AM
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