S13Sky Posted October 12, 2022 Report Share Posted October 12, 2022 not sure why the ac fan turns on only on key on position. i am using stock wiring (93 240sx coupe se 2 pin plug) connected to a 10" spal fan. fuel table Cold Start2A (11).pclx Quote Link to comment Share on other sites More sharing options...
S13Sky Posted October 12, 2022 Author Report Share Posted October 12, 2022 Sorry I meant accessory Quote Link to comment Share on other sites More sharing options...
Adamw Posted October 13, 2022 Report Share Posted October 13, 2022 Have you got the jumpers in the 91-93 positions? Quote Link to comment Share on other sites More sharing options...
S13Sky Posted October 13, 2022 Author Report Share Posted October 13, 2022 Yes originally they weren’t so I swapped it to correct config Quote Link to comment Share on other sites More sharing options...
Adamw Posted October 14, 2022 Report Share Posted October 14, 2022 So are you saying that solved your problem, or you now have the problem after changing the jumpers? Quote Link to comment Share on other sites More sharing options...
S13Sky Posted October 14, 2022 Author Report Share Posted October 14, 2022 Before I had my jumpers wrong and my car wouldn’t start but still had the fan issue. My car runs now but still same fan issue So basically always had this issue since I ran this ecu. Quote Link to comment Share on other sites More sharing options...
Adamw Posted October 14, 2022 Report Share Posted October 14, 2022 Can you give us a pic of your jumpers as they are now. The AC running issue you are experiencing sounds very much like a backfeed through an aux output. But looking at the ecu schematic and the factory wiring diagram I cant see anyway for that to happen if the jumpers are in the right position. As a further test to help rule out some possibilities, could you also completely remove these 2 or 3 bottom jumpers (so you just have 6 bare pins sticking up), then turn ign on to ACC and tell me if the fan still runs. Quote Link to comment Share on other sites More sharing options...
S13Sky Posted October 17, 2022 Author Report Share Posted October 17, 2022 Removed the 2 jumpers. Turned to acc and fans still run Quote Link to comment Share on other sites More sharing options...
Adamw Posted October 17, 2022 Report Share Posted October 17, 2022 With those J5/6/7 jumpers removed the fan relay wire (pin 9 or 10) wouldnt be connected to anything as far as I can see. I cant see how the ecu could be causing this fan to run unless someone has moved its wire to some other pin? Quote Link to comment Share on other sites More sharing options...
S13Sky Posted October 22, 2022 Author Report Share Posted October 22, 2022 I connected my stock 62/63 ecu just to test and it worked. Not sure if one of my settings in the program is making this happen. Quote Link to comment Share on other sites More sharing options...
Adamw Posted October 23, 2022 Report Share Posted October 23, 2022 Can you tell us what ecu pin your fan relay is connected to. Quote Link to comment Share on other sites More sharing options...
S13Sky Posted October 24, 2022 Author Report Share Posted October 24, 2022 Pin 11 aux3 for AC clutch. Pin106 inj6 for ac fan. Quote Link to comment Share on other sites More sharing options...
Adamw Posted October 24, 2022 Report Share Posted October 24, 2022 7 hours ago, S13Sky said: Pin 11 aux3 for AC clutch. Pin106 inj6 for ac fan. Are you sure? All documentation I can find shows the opposite. With the ignition on, if you set inj6 between "test on" and Off, does the fan turn on and off? Same with Aux 3, if you set it to test mode and back, do you hear the AC clutch click? Quote Link to comment Share on other sites More sharing options...
S13Sky Posted October 24, 2022 Author Report Share Posted October 24, 2022 sorry the cal file wasnt updated. basically whichever way i set it, aux 3 was always ac fan and inj6 was always ac clutch. should i swap pins on the ecu? fuel table Cold Start2A (DI EDITTED).pclx Just swapped it just to see. Same problem but instead of my fan turning on my ac clutch engages. So something Is wrong with pin 11 AUX 3 Quote Link to comment Share on other sites More sharing options...
Adamw Posted October 25, 2022 Report Share Posted October 25, 2022 This is a back feed issue as I mentioned earlier. Inj drives dont have a flywheel diode so wont back feed, aux outputs do have a flywheel diode so will back feed if the aux device has power when the ecu is off. So the problem is the 12V supply to your AC clutch and Fan relay must be connected to a supply that turns on in the ACC position rather than only in Ign position like it should. Quote Link to comment Share on other sites More sharing options...
S13Sky Posted October 25, 2022 Author Report Share Posted October 25, 2022 Okay so just trace the wires coming off the two relays? Quote Link to comment Share on other sites More sharing options...
S13Sky Posted October 25, 2022 Author Report Share Posted October 25, 2022 Or could you point me in the right direction? I didn’t touch stock wiring so idk how that’ll happen Quote Link to comment Share on other sites More sharing options...
Adamw Posted October 26, 2022 Report Share Posted October 26, 2022 Here is the factory wiring diagram. ECU Pin 11 goes to the AC relay, the AC relay coil gets its supply from ign "on", fuse #5. And here is the EL power section that is referenced in the first diagram - showing fuse 5 only gets 12V with ign in ON position, there is no connection in Off, ACC or Start positions. Quote Link to comment Share on other sites More sharing options...
S13Sky Posted October 26, 2022 Author Report Share Posted October 26, 2022 Is this for 1993 s13? Not seeing and 7.5 amp fuses in my car. Looking through a nico fsm right now Quote Link to comment Share on other sites More sharing options...
S13Sky Posted November 28, 2022 Author Report Share Posted November 28, 2022 only way i could fix this was to depin #11 (aux 3) and move it over to pin #115 (injector 8 [aux]), then assigned injector 8 to engine fan 1. will this work in the long run? Quote Link to comment Share on other sites More sharing options...
Adamw Posted November 29, 2022 Report Share Posted November 29, 2022 Yes, injector drives dont have flywheel diodes so wont back feed. Quote Link to comment Share on other sites More sharing options...
S13Sky Posted November 30, 2022 Author Report Share Posted November 30, 2022 Thank you! Quote Link to comment Share on other sites More sharing options...
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