WTB/T: P72 GSR HEAD
12-12-2008, 01:25 AM
#12
3.0 BAR
Join Date: Mar 2006
Posts: 5,631
Re: WTB/T: P72 GSR HEAD
01-07-2009, 02:32 PM
#18
0.0 BAR
Join Date: Feb 2003
Posts: 0
Re: WTB/T: P72 GSR HEAD
I broke them out Sunday and have been hammering on them. Bad IACV/ghost CEL4/fuel pump is no problem, but the ones that were chipped wrong might have to live the rest of their lives as de-chipped and stock, if they are salvageable. I haven't gone fully over the circuits yet (much more complex than simple actuator troubleshooting) but the four I fixed with jumper wires that test good between every pin of the EPROM and wtfever it goes... meh, still solid CEL. If it's just something simple like 373 latch or 541 buffer fried, no problem, but the MCU and OKI 82C55 ASIC aren't shelf parts as well as 42+ pin PITAs to swap even if a supply of them could be located.
BTW, p28.pdf has some clerical errors and shouldn't be fully trusted without double checking.
Also, very interesting, two of the (virgin) ECUs CEL 0 with no fuel pump activation. I only see that when there's no chip installed/wrong .bin (like, motherboard firmware flashed to the chip by accident, don't ask how I know) and J1 is bridged, I'm thinking the stock program is wiped and they might be fixable by chipping. I'm likely wrong, but it's an idea.
BTW, p28.pdf has some clerical errors and shouldn't be fully trusted without double checking.
Also, very interesting, two of the (virgin) ECUs CEL 0 with no fuel pump activation. I only see that when there's no chip installed/wrong .bin (like, motherboard firmware flashed to the chip by accident, don't ask how I know) and J1 is bridged, I'm thinking the stock program is wiped and they might be fixable by chipping. I'm likely wrong, but it's an idea.
