I had my original ECU bite the dust back in '04 and replaced it with a new stock unit, sans Upsolute chip. I saved the old ECU in hopes it could be repaired. When problems first started, the symptom was no boost and DTCs indicated a short or open circuit in the N75 system. As the N75 checked out, it had to be the ECU. I had some success with piping cold air (thermoelectric cooling module)to the ECU but this was only stopgap as it soon failed completely.
Fast forward to yeasterday when I popped the cover and went on a 10x magnification problem hunt. Sure enough, I found the bad solder joint! An SMD diode (freewheeling diode) on the N75 circuit had some soldering flux between the board and device, causing thermal-induced mechanical stress on the solder joint.
Since I don't have any lead-free solder, I "washed" the pads with eutectic SnPb, using a solder vac to remove the junk. Then I was able to use real solder to fix the joint.
After adapting it to the immoblizer and clearing the DTC's (from 2004! talk about non-volitale memory!), I took it out for a test drive. Must remember, PP520s with an original Upsolute program are NOT friendly combination to a stock DMF clutch!
But I am happy. And have a spare stock ECU!
Yes, it smokes.
Fast forward to yeasterday when I popped the cover and went on a 10x magnification problem hunt. Sure enough, I found the bad solder joint! An SMD diode (freewheeling diode) on the N75 circuit had some soldering flux between the board and device, causing thermal-induced mechanical stress on the solder joint.
Since I don't have any lead-free solder, I "washed" the pads with eutectic SnPb, using a solder vac to remove the junk. Then I was able to use real solder to fix the joint.
After adapting it to the immoblizer and clearing the DTC's (from 2004! talk about non-volitale memory!), I took it out for a test drive. Must remember, PP520s with an original Upsolute program are NOT friendly combination to a stock DMF clutch!
But I am happy. And have a spare stock ECU!
Yes, it smokes.