I've been searching the forums for info on the PCM not triggering the fans per the ECT settings. There are several posts that have a somewhat similar scenario but I'm not finding any resolution. The project is a modified GEN 3 5.3 swap into a 3rd gen Camaro using a 1999 F-body P01 PCM, custom stand alone harness and 98-02 f-body cooling fans using the matching f-body ls1 three relay fan harness. I had just gotten my MAF scaling for the custom CAI and LS7 card MAF dialed in close enough to allow me to warm the engine up to operating temp and start fine tuning the idle when I noticed that the low speed fan had not kicked on. The engine temp was up to 200 degrees according to the scanner and the set points for fan 1 were 190 "on" 185 "off". I was not able to warm the engine to a higher temp as I had also noticed my heater core had developed a leak. Using the VCM scanner both low and high speed seem to be functioning as they should but even by lowering the "on" and "off" temps in the editor to below ambient I am not able to get the fans to trigger on. I'm not sure if this makes any difference but I do have the f-body 3 pin AC pressure switch plugged into the harness. I do not however have the AC compressor plugged in. Still need a couple custom hoses to complete the AC system. What am I missing here? Ill attach the tune but keep in mind it still has a long way to go. Like I said I've just got the MAF and IAT scale close enough for idle tuning. Now I'm working the idle up using another users bulletin for idle tuning with a larger cam.
HP tuners bullitin bigger cam tuning 2.hpt