In recent times, isc computersciencepracticalquestion paper has become increasingly relevant in various contexts. Troubleshooting ECU drivers and the ISC - GalantVR4.org. I'll test the ISC tomorrow to confirm it's bad, but suffice it to say something bad happened and completely fried the ISC driver. The ECU seemed fine up until recently, when I installed the WB. I mentioned this to Thomas, who seemed to think the WB install couldn't have caused the issue. Let's talk FIAV and ISC block off plates!
The ISC did just fine, though as stated already - took a few more cranks and sometimes a second of throttle to get it idling normally. Btw, 3 out of 4 adjusters were easy as pie to adjust down.. the runt of the litter was a B*tch! Blow torch and all it took like an hour and a half to get it all of the way down.
ECU/ISC Driver question - GalantVR4.org. As I work through many, many issues with 1587, I have found that I have a blown ISC driver (IC105). According to ECM Tuning, the drivers do the following functions: IC104 controls ECU pin 14 ('90) or 6 ('91+), MAF Reset signal. The other half of the chip is unused on US DSMs. Setting BISS and ISC Range - GalantVR4.org.
You want the ISC in the middle of it's range, while adjusting the BISS for optimal setting (Our idle should be 800 RPMs). Equally important, but what exactly is the middle of it's range? If you log it, I think it goes anywhere from 0-100+.
Does anybody have hard evidence on where it should properly be set @ idle with a logger using MMCD? In relation to this, iSC replacement options. Seems the ISC driver kursploded from a short, which explains why it was unplugged. The OEM replacement seems to be big money.
Has anyone had any luck with the one offered by Rock Auto? Are there better options I'm not finding? I have yet to OHM mine out but with the motor unplugged and the damage I'd say there's a good chance it's bad. isc not working - GalantVR4.org. So replaced the ISC after my last ecu blew a driver, I replaced the ecu and rewired the pump as some of you may remember, I have a bad idle surge now, and I adjusted the biss all the way in and still idles and fluctuates around 12-1600 rpms, The ISC I pulled out to see if it'd move with the key...
ISC Failed - GalantVR4.org. I want my ISC because it makes the car much nicer to drive in traffic and it saves on the footwork needed to keep it from stalling. I had no ISC for a long time and it sucked having to balance between lights being on, fans being on, etc vs having a livable idle speed plus during the winter its 30-40 degrees in the morning and 60-80 in the ... OP, if your car has boost leaks, misadjusted TPS, misadjusted ISC, misadjusted base ignition timing, dead o2, over heating, forget it dude.
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