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Old 08-16-2010, 01:02 PM   #1
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Default parallel megasquirt install fans don't work


With all your help I've got my 97 miata running fantasticly.. except for one small detail. Apparently the fans don't come on. I expected the stock ECU to kick them on, but it's not happening.

I am going to go to a standalone configuration to simplify the situation.

From the wiki I see the easiest way to control fan is D15.

From the photo here.

Do you remove D15? I assume that you no longer need JS0 connection or the Diode.

I do however need to put the diode on the harness between the AC fan and the standard fan..

If I want to test the fans without a computer plugged in, do I just give 12V to 1A and 1B?

Thanks again!
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Old 08-16-2010, 01:28 PM   #2
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If you want to test the fans operation, open your diagnostics connector and jump TFA and GND.

the ECU controls the fans, so if you have a MS running the show, it needs to be modded to run fan should only use the D15 circuit for fan control if you've replaced the 3904 transistor with a 2PN2222
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