Tapps33
Full Access Member
Hey guys! I’m hoping someone in the forums understands how the LR ECU handles PWM signals?
Long story short, I’m in the process of swapping to an electric water pump and electric cooling fans. The only real problem I haven’t solved (aside from how to route the serpentine) is how to fool the computer to think the fan is still there.
As far as I can tell, the ECU sends a PWM signal to the fan for rom requirements, the fan in turn sends a PWM return signal indicating how many rpm’s it’s actually turning. Thus, if it ever gives out, the fan won’t meet the required speed and you’ll throw a code.
So the big question is, does anyone have any idea how I could fool the computer? I’m guessing there’s got to be a simple logic circuit I could put together to simply mirror the rpm request into an rpm output?
Sent from my iPhone using Tapatalk Pro
Long story short, I’m in the process of swapping to an electric water pump and electric cooling fans. The only real problem I haven’t solved (aside from how to route the serpentine) is how to fool the computer to think the fan is still there.
As far as I can tell, the ECU sends a PWM signal to the fan for rom requirements, the fan in turn sends a PWM return signal indicating how many rpm’s it’s actually turning. Thus, if it ever gives out, the fan won’t meet the required speed and you’ll throw a code.
So the big question is, does anyone have any idea how I could fool the computer? I’m guessing there’s got to be a simple logic circuit I could put together to simply mirror the rpm request into an rpm output?
Sent from my iPhone using Tapatalk Pro