scans of 1720 board
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| Continuity tests chipping obd1 ecus http://forum.pgmfi.org/viewtopic.php?f=54&t=15500 |
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| Author: | jheybry [ Sat Feb 02, 2008 6:08 pm ] |
| Post subject: | Continuity tests chipping obd1 ecus |
i am troubleshooting some solid cell ecus (some w/ J1, some w/o J1) here's some info i got. i think it's useful in identifying bad solder of sockets for IC3 and IC4 (IC3 = 27256 and IC4 = 74hc373) consists of continuitys with ohms of resistance and noted observations. hardware info from: 37820-po6-a51 testing tool: craftsman mod#82139 digital multimeter 1720-1500 UNCHIPPED AUTO -OKI = OKI66207 MCU top side edu --27256 top half, left to right = 1-14, ECU plugs to left test lead sequence: red - black 1-2 = 11.9m 1 cont w/ c52 and 27256 bottom half 2 2 cont w/ OKI 15 2-3 = ol 3 cont w/ OKI 14 3-4, 4-5, 5-6, 6-7 = ol 7 cont w/ R52 2 and OKI 23 7-8, 8-9, 9-10 = ol ** 9-10 = 11.3k 9 cont w/ R54 1 10-11, 11-12, 12-13, 13-14 = 19.99k --27256 bottom half, left to right=1-14 , ECU plugs to left test lead sequence: red - blk 1-2 = 21.08m 2 cont w/ OKI 13 2-3, 3-4, 4-5, 5-6, 6-7, 7-8, 8-9, 9-10, 10-11, 11-12 = ol **11-12 = 20k 12-13 = 19.9k 13-14 = 10.3k 14 cont w/tracing around **after adding c51, c52, r54, and j1 jumpered NO VALUES CHANGED FOR 74hc373 when socketed and ** --74hc373 top half, left to right=1-14, ECU plugs to left test lead sequence: red - blk 1-2, 2-3 = ol 1 cont w/RM3 1 3-4 = 19.9k 4 cont w/ IC9 (74hc541) top 5 4-5, 5-6, 6-7 = ol 7 cont w/RM3 9 and then OKI 8 7-8 = 19.9k 8 cont w/RM3 8 and then OKI 7 8-9, 9-10 = ol 9 cont w/ IC9 ? (can't see under IC9) --74hc373 bottom half, ECU plugs to left test lead sequence: red - blk 1-2, 2-3 = ol 1 cont w/ tracing around it 3 cont w/RM3 2 3-4 = 20k 4 cont w/RM3 3 4-5, 5-6, 6-7, = ol 7 cont w/RM3 4 and IC9 top 8 7-8 - 19.9k 8 cont w/ RM3 5 and IC9 bottom 10 = 10.3k 8-9, 9-10 = ol 10 cont w/tracing around --other observations from top side of ECU J1 1 cont/ OKI 27 J1 2 cont/ tracing around it (incl OKI 32, R54 2 ...) c52 2 cont/ tracing around it (incl OKI 32, R54 2 ..) c51 2 cont/ tracing around it (incl C30 2, CN2 3...) BOTTOM ECU OBSERVATIONS ECU PLUGS to LEFT --27256 ECU top, bottom half, left to right =1-14 1 to RP3, RP7, RP17, RP5, RP13, CN2 3,... 11 to IC9 top, top 10, then to 74hc373 top, bot 3 12 to IC9 top, top 9, then to 74hc373 top, bot 4 13 to 74hc373 top, bot 7 14 cont w/tracing around it --27256 ECU top, top half 1 to RM3 top, top 1 4 to OKI 9 5 to OKI 10 6 to OKI 12 8 to OKI 11 10 to RM3 9 11 to RM3 8 12 to RM3 7 13 to RM3 6 14 to RM3 5 74hc373 top, bottom half, left-right = 1-14 1 cont w/tracing around it 2 through board to 27256 top, bot 10 3 to IC9 top, top 10 4 to IC9 top, top 9 5 through board to 27256 top, bot 9 6 through board to 27256 top, bot 8 7 to 27256 top, bot 13 9 through board to 27256 top, bot 7 74hc373 top, top half, left-right=1-14 1 to c51, r50, etc, ... also through and through to 27256 top,top 1 2 through to 27256 top, bot 6 3 through to IC9 top, top 6 5 through to 27256 top, bot 5 6 throught to 27256 top, bot 3 7 through to IC9 top, top 3 8 through to IC9 top, top 4 |
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| Author: | 88civichbz6 [ Sat Feb 02, 2008 8:50 pm ] |
| Post subject: | Re: Continuity tests chipping obd1 ecus |
great info i always test my work before sending it out. |
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| Author: | JaredKaragen [ Mon Feb 04, 2008 4:21 pm ] |
| Post subject: | Re: Continuity tests chipping obd1 ecus |
same here, but I have traced the wires soo many times now I just know where to look, every once in a while I am a pin off =P |
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| Author: | jheybry [ Tue Feb 05, 2008 1:18 pm ] | ||
| Post subject: | Re: Continuity tests chipping obd1 ecus | ||
scans of 1720 board
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| Author: | jheybry [ Tue Feb 05, 2008 1:29 pm ] | ||
| Post subject: | Re: Continuity tests chipping obd1 ecus | ||
more
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| Author: | HeathN [ Sun Feb 10, 2008 8:00 pm ] |
| Post subject: | Re: Continuity tests chipping obd1 ecus |
Keep the good info coming. |
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