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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 05-05-2010, 01:00 PM   #1 (permalink)
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2001 e46 318i Touring - Testing engine cooling fan

Hi All,

Does anyone know how to test the electric cooling fan on a 2001 e46. The unit is not relay controlled but has an electronic FCM (fan control unit), mounted on the fan frame, which has a permanent 12 volt supply and controls the fan speed using a PWM signal from the management control unit.

Does anyone know how to test for presence of the PWM signal that the FCM should get to turn the fan on?

Does anyone know if applying 12 volts to the terminals of the fan itself will damage the FCM (it may not like having 12 volts applied across its output terminals)

Regard and thanks.
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Old 05-05-2010, 02:57 PM   #2 (permalink)
OMFG another one!?
 
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Does the car have A/C? Turning the A/C on should switch on both fans even with a cool engine.
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Old 05-06-2010, 04:49 AM   #3 (permalink)
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Yes car has A/C and the fan only ever runs sporadically; one day it will cut in, another day it won't but the conditions are the same.

Cheers.
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Old 05-06-2010, 09:20 AM   #4 (permalink)
OMFG another one!?
 
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That seems like a loose connection issue.
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Old 05-11-2010, 01:03 PM   #5 (permalink)
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No loose wires.
Fan runs if coolant temperature sensor is disconnected.
New temp sensor interacts with cam sensor and drives ECU potty, see http://www.bimmerwerkz.com/forum/3-s...ecu-70418.html
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