Could anyone help, we have a 2003/4 CLK 55 AMG convertible, the suction fan is permanently on as soon as the ignition is turned on and it shows the warning, coolant visit workshop. We have put the car on MB Star and it has a current stored fault in engine which we can not erase, it says pP2073-001 Electric suction fan for engine or air con, short circuit to positive (p1999) current and stored. Fuses checked along with relays. We have checked the suction fan module which proves ok, we have also retro fitted a section of loom as shown on MB Star which fits between fan module and loom plug. Everything seems to be pointing to the ecu, but at £1186.00 we need to make sure, any advice would be greatly appreciated.
CLK 55 AMG suction fan - advice needed!
alibally
Active Member
How many wires are going to the fan motor? If its only 2 then the is a fan control unit under the wing. These can cause your problem as they get water damaged. There is a heavy permanent feed and earth, an ignition feed and a PWM signal wire from the control unit.
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Check the fuses in the front right SAM module.
headcreeps
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There are 2 wires between engine control unit and the fan control unit.
One of these is also connected to a fuse and relay, so I assume this is the "ignition feed", which means the other one is the PMW signal.
The PMW signal is a ECU output correct? An oscilloscope would ideal to visualize the pulses, but will a multimeter produce any idea if this ECU line is moving?
