Cooling fan always on? Wtf?
#25
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Brain, I tested just like you said, and it didn't work... Even though I set everything for outpu 4 (LED18 to Output4, Fan Control in the other panel, and set the temperatures roughly to what you said) but the fan kept on running. I was able to observe that, with LED18 set to Warmup (like it was) the Output4 gave an ON signal on Megatune's dashboard, and with it set to Output4, the Output4 gave an OFF signal. Regardless, the fan kept on running.
Also I noticed it only runs IF the engine is running. I thought it did on ignition, but nope, it's only with the engine revving. On ignition, the fan stays off.
Also I noticed it only runs IF the engine is running. I thought it did on ignition, but nope, it's only with the engine revving. On ignition, the fan stays off.
#31
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Okay so I'm back with NEW problems regarding this...
After I set the X2/JS0 to Fan Output like I said before, it all worked fine until recently. A new relay got stuck AGAIN! Only this time it was clicking while the car was cold.
I checked the relay wires with a multimeter. Between the main tabs, there's a differential of 12V which, when shunted, turns on the fan. That checks out.
I then checked the relay activation line. It measures a despisable amount of voltage when ignition is on (< 0.05V ), it measures a variable amount of voltage with the engine ON, and when the Fan is finally at the set temperature, it shows 14V as it should.
Now the odd thing is... The values it shows on the voltmeter with the engine running while below fan threshold are odd. They vary between 1-2V on the display, but from the relay clicks I figured the relay is momentarily activated at the same rate as the engine turns. It is as if there was an impulse signal to the relay when the fan is below threshold but the engine is running.
Could this be caused by a bad earth somewhere, a misconfiguration in my MS, or should I be looking into damage inside the MS itself?
Any help would be appreciated as this almost cost me my engine a few days ago when the car overheated badly because of this...
After I set the X2/JS0 to Fan Output like I said before, it all worked fine until recently. A new relay got stuck AGAIN! Only this time it was clicking while the car was cold.
I checked the relay wires with a multimeter. Between the main tabs, there's a differential of 12V which, when shunted, turns on the fan. That checks out.
I then checked the relay activation line. It measures a despisable amount of voltage when ignition is on (< 0.05V ), it measures a variable amount of voltage with the engine ON, and when the Fan is finally at the set temperature, it shows 14V as it should.
Now the odd thing is... The values it shows on the voltmeter with the engine running while below fan threshold are odd. They vary between 1-2V on the display, but from the relay clicks I figured the relay is momentarily activated at the same rate as the engine turns. It is as if there was an impulse signal to the relay when the fan is below threshold but the engine is running.
Could this be caused by a bad earth somewhere, a misconfiguration in my MS, or should I be looking into damage inside the MS itself?
Any help would be appreciated as this almost cost me my engine a few days ago when the car overheated badly because of this...
#34
![Unhappy](https://www.miataturbo.net/images/icons/icon9.gif)
My 91 Miata continues to drain the battery during the night sitting in my garage with the ignition off. I changed out the relay that I thought was the issue and changed the battery as the old one was weak. I walked out a week later to find the Miata fan running full blast with the ignition off. Could the temperature sensor cause this issue with the ignition turned off or does anyone have any other ideas? thanks
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