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Thread: PWM radiator fan controller
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03-19-2026 #141
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a 10K between Ign power and the pwm signal, correct? just to be sure
Mike
69 Camaro - In the Works
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03-19-2026 #142
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That is what I would try.
Originally Posted by AEH
1969 Camaro - LSA 6L90E AME sub/IRS
1957 Buick Estate Wagon
1959 El Camino - Ironworks frame
1956 Cameo - full C5 suspension/drivetrain
1959 Apache Fleetside
03-20-2026 #143
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No luck with the pull-up resistor. My cheap oscilloscope came in. If I’m doing it right there is no pwm signal coming from the ecm. It’s also a signal generator and I was able to hook it up and control the fans. Ramp them up and down. I’m thinking my ecm may now be the right vintage and may not be capable. It’s supposed to be from a 2009 ctsv. Any other ideas to try?
Mike
69 Camaro - In the Works
03-20-2026 #144
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When you checked with the scope did you have the pull-up installed?
1969 Camaro - LSA 6L90E AME sub/IRS
1957 Buick Estate Wagon
1959 El Camino - Ironworks frame
1956 Cameo - full C5 suspension/drivetrain
1959 Apache Fleetside
03-20-2026 #145
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- Arkansas
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Yes, I tried it both ways, a bunch of ways actually. But I’m not sure if I had it hooked up correctly. The manual that came with it says nothing in 4 languages and I’m not familiar with the use. I was able to see some 500ish hz noise in the system. Form the battery charger I think.
Mike
69 Camaro - In the Works
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