Jo LeForce Posted January 12, 2017 Report Share Posted January 12, 2017 Got a G4 Extreme plug'n'play Evo 4-8 ECU, the wiring loom is of an Evo 7. I'm not getting any signal out of auxiliaries to operate the fan! I assigned the fan to 3 different auxiliaries to no avail. The fan works fine when fan wire is grounded which eliminates any fuse/fan motor issue. Using a multimeter I found that the ECU is not outputting a signal through the assigned AUX when fan conditions are met! Any suggestions ? Quote Link to comment Share on other sites More sharing options...
Scott Posted January 13, 2017 Report Share Posted January 13, 2017 The engine fan system does vary across the Evo 4 to 9 models.Most Evo 4 to 6's will have the engine fan work by grounding pins 20, 32, and 34 through Aux-Ignition 4.Some Evo 7 and 8's and all Evo 9's will control the engine fan by applying a PWM signal to pin 21 via Aux output 1. I believe 100% in the duty cycle table will give 0% fan and 0% in the table will give 100% fan. The relationship is inverse.Scott Ttpcar 1 Quote Link to comment Share on other sites More sharing options...
Simon Posted January 16, 2017 Report Share Posted January 16, 2017 When testing are you using the function as FAN and then lowering the on temp? As if doing this the ECU requires a RPM signal before turning on the fans. Quote Link to comment Share on other sites More sharing options...
Grant Baker Posted August 4, 2017 Report Share Posted August 4, 2017 Out of interest, would this work with a straight on/off output or do you have to use a GP PWM output?Any examples of setup? We tend to use aftermarket fans and go with a simple on-off relay, but have got a fairly stock car here at the moment that I'm setting up with stock fan controller. Quote Link to comment Share on other sites More sharing options...
Simon Posted August 6, 2017 Report Share Posted August 6, 2017 That bulk of stock controllers will be a simple set up of high low and maybe a medium speed controlled via simple on off type signals.But there are some that use a PWM signal and in that case will need to use a GP PWM out put EVO being one example. Quote Link to comment Share on other sites More sharing options...
Grant Baker Posted August 7, 2017 Report Share Posted August 7, 2017 Using this video:https://vdoubleyou-scott.tinytake.com/sf/Mzc0NTYwXzIxMjE0NTU(Thanks!)The fan works well on PWM, but for some reason, still runs with engine off... Quote Link to comment Share on other sites More sharing options...
Simon Posted August 7, 2017 Report Share Posted August 7, 2017 Is that engine off, key on or engine off, key off? Quote Link to comment Share on other sites More sharing options...
Grant Baker Posted August 7, 2017 Report Share Posted August 7, 2017 Engine off, key on.I've sorted it now by doing the fans how I prefer doing them! Quote Link to comment Share on other sites More sharing options...
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