e46 320d Low Engine Temperature

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  1. e46 320d Low Engine Temperature 
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    Hello to all guys, I am new here, also new owner of a bmw 320d e46 m47 engine 136 hp, which is a great car.
    I have little issues , even if the car works like a charm.
    The gauge engine temperature is now working, it stays only on the blue part, and i i run self test, that gauge is coming up until the middle(between blue and red).
    Also i checked the temperature on OBC channel test 7.0, the temperature on stationaty is -3 celsius degrees(i think not possible in reality), and it increses to 006 and stops here. What problem could be? If i start kilmatronic everything it's ok, after 4-5 km it gives hot air, and if i open the hood, the engine is pretty warm.
    What problem could be?
    Thanks.
     
     

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    It might be the temperature sensor if the readings are impossible, for example 6'C when the engine is warmed up.
     
     

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    It's strange because i don't have errors related to temperature sensor, and the air from AC is pretty hot , above 25 degrees how could be the engine so cold. The consumption is aprox 6.5 liter per 100 km on BoardComputer after warming up. First 4-5 kilometers i have around 20 liters consumption.
    At the engine module i have only these errors.
    5 Needle-motion sensor - This i know that is an injector sensor issue but didnt make problems to me.
    Signal open circuit or KS after B+
    Plausibility with Speed(rpm) sensor-Pulse
    Error sporadic
    66 Control unit DDE (EEPROM and configuration) - I think related to first error because the fuel pump doesnt receive signal from injector and it works with default values.
    adjustment checksumme
    27 Coolant temperature heater - This i think that it's auxiliary water/heater pump but i dont know if here could be the problem
    activation Open circuit or KS after B-
    16 Relay air conditioning compressor - ..Have no idea , because my AC it's working. I think that ex-onwer made a 0-1 switch on console for AC compressor to bypass some relay because i never seen at another bmw that switch, but AC is working fine.
    activation Open circuit or KS after B-
     
     

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    66 is an interesting one, has there been anything like an engine or ECU swap carried out at some point?
     
     

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    If during driving and the temp gauge does not go out of the blue then you have thermostat issue.By klimatronic I presume you mean aircon which will put an extra load on the engine so the engine gets more hot which will make the gauge go up more.During normal driving the temp gauge should be at the 12 o clock position after 5/6 miles and in obc the temp should be 88 to 92 degrees.
     
     

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    I know..must be around 90 degrees. First time i thought it was a gauge fault, or some bad contacts but i checked with INPA and still the same, around 004 005 degrees even after 30 40 km of driving. Why no thermostat related error on INPA ?
    How is possible to be the real temperature(4 degrees), because when I open the hood , the engine its hot like my ex Seat 1.6 petrol engine which worked well.
    It affects my fuel consumption ? I activate Boardcomputer and i have a very decent consumption, 6-7 liters / 100km, i think that if it was thermostat the consumption was bigger. How can i check thermostat without removing it ?
    @TheEnd thanks for the question , but as i know and MOT , the engine wasnt replaced, i dont know anything about ECU, but it is a DDE 3.0. I dont know how must run this car for 136 hp but i think that is working fine with good acceleration.
     
     

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    Are you certain you are reading the right data on the OBC?
    It's better to get an INPA lead and check the live data with the ECU.
     
     

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    Quote Originally Posted by TheEnd View Post
    Are you certain you are reading the right data on the OBC?
    It's better to get an INPA lead and check the live data with the ECU.
    I`m sure that OBC data is the right one. Test 19 -> OFF, activated hidden functions, and after that test 7.0 coolant temperature. I checked at another bmw and its ok, about 90 degrees, at me..max 007 like james bond agent
    I quit addictions for my 'girl' from BMW
     
     

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    Inpa will not tell you if a thermostat is bad as it has no sensor in it.If your gauge is staying in the blue then its most likely the main stat is bad.If the gauge reaches 12 o clock but obc temp is still low then its most likely the egr stat.
     
     

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    Quote Originally Posted by edber View Post
    Inpa will not tell you if a thermostat is bad as it has no sensor in it.If your gauge is staying in the blue then its most likely the main stat is bad.If the gauge reaches 12 o clock but obc temp is still low then its most likely the egr stat.
    Good, i understand what you mean, but there couldnt be possible a faulty temperature sensor ? I run today about 10km, i opened the hood and i've seen that engineblock is very hot, i can't put the hand on it. The digital temperature is 004, i dont think that at 4 degrees i cant put the hand on it. Can i check the thermostat without removing it ?
    I quit addictions for my 'girl' from BMW
     
     

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