Fiat Stilo 1.9 Diesel 2003 - Engine cooling fan fault #
Posted by Dave Hill on April 23, 2010, 5:48 pm
Year of Manufacture *: 2003 Engine Code or CC *: 192A3.000 1920cc ( Optional ) ECU Type: Bosch EDC 15C ( Optional ) Scanner Used: Autodiagnos
Model STILO ACTIVE... Engine Size 1910 cc Engine Model 192A3.000 Manufactured 2003 Registered 30-04-2003 Transmission MANUAL Colour GREY
Afternoon all.
I have the car detailed above in with the cooling fan running constant at key on, as if it has defaulted "safe" to temp sensor malfunction. Live data shows a plausible coolant temp value. There is no aircon on this car. No DTC's present.
There is a fan control unit fitted top centre on the radiator, with two hefty feed/ground wires going into the controller & two hefty wires coming out & going to the fan. There are two thin control wires, one has a permanent feed & the other is pulled to ground by the engine ECU at key on. The fan has a slow start function (not simply on or off.) I would expect a pwm signal to regulate the controller, but so far I haven't found anyone with a known good one to draw a comparison. It is looking like fan controller or engine ECU, so I need to be sure.
If anyone can get their hands on one of these & take a capture of the fan control signal, I would be very grateful.
Cheers all
Dave
Re: Fiat Stilo 1.9 Diesel 2003 - Engine cooling fan fault #
I sent the PCM to ECU technologies & they informed me that it was OK. They said that they had witnessed a switch from "off" to "on", at the fan control output of the PCM. I mentioned that we had seen a PWM signal on a similar donor car & they said they would re check & let me know. Again they assured me that it was OK & they had verified it against another "known good" PCM that they have.
We took our unit back & after double checking everything I decided to order a new PCM. These are plug n play & just need injector correction factors entering. The new unit performed exactly as expected, with a nice PWM signal.
With hindsight I should have been confident in our own checks & not waisted the 35 quid on testing fees.
Here is a capture, displaying an off state through to a slow fan state.
on June 17, 2010, 7:40 pm, in reply to "
