Burn the stock bin file, if it still does that then look into the eprom programmer settings or the programmer itself might be bad. However if all is fine with the stock file then you might have a checksum problem.
Burn the stock bin file, if it still does that then look into the eprom programmer settings or the programmer itself might be bad. However if all is fine with the stock file then you might have a checksum problem.
-Carl
I know this might sound dumb, but I've done this myself...
Are you sure you have the ribbon cable installed correctly in the MEMCAL adapter?
About checksum. TP automatically updates checksum when you save a bin, so if you're burning EEPROMs, disabling Checksum is not needed. If you're uploading whole bins to an emulator, sometimes you can get away without checksum being disabled, however, if you're truly emulating, where only singular changes are being made checksum absolutely has to be disabled. That being said I have had a couple instances where it wasn't disabled, and emulating SEEMED to work, but wasn't really working properly.
Installing an unmodified MEMCAL, does the engine start?
The man who says something is impossible, is usually interrupted by the man doing it.
well, no, not exactly. The ICM fires it, when it's time for the .bin to take over, it chokes. This happens with checksum disabled as well. That's being said it has 36lb injectors on it, so the one time it started, it was rough and I'm 99% my limp mode for the 19lb'ers were running it. I didn't let it run long.
I double checked my cable, it seemed fine. I have a question. I've heard (read) about hitting the ecm with a bad checksum could brick it. Now I've tried multiple ecms, but they have all been hit with the same bin at one time or another, during this fiasco.
Is the checksum regenerated/updated when you make changes in emulation, i.e. like changes fueling etc?
No, bad checksum will not brink an ECM, at least not OBD1 ECMs.
No, checksum is only updated when the bin is saved. This is why checksum needs to be disabled during emulation.
So are you saying that it runs on base timing, but not when timing is being commanded by the ECM?
The man who says something is impossible, is usually interrupted by the man doing it.
Correct. that's what I believe is occuring. Where I'm getting confused is this happens regardless of what bin you use. Even a factory unmodified bin that never hits tunerpro, just straight to the prom, gets you a flickering light.
Same with emulation. The one exception; in beginning an emulation session, disabling checksum gets you no CEL, but what I perceive as the base timing only issue. With the flickering light, you don't even get the stumble.
I've got WB02 wired in, otherwise a fairly solid/stock wiring harness throughout the car. I would blame my chip burner, seeing as how you get the issue bypassing TP, but I can't get through with emulation either.
Possible electrical? what would (if anything) invoke this ECM behavior if it electrical and not in the bin/hardware?
First test, and best. Key off for 30 seconds or more. Then turn key on but do not start car. CEL shoould light for 5-10 seconds, turn off for several seconds, then turn on and stay on. If this does not happen then you shouldn't bother trying to start the engine. This test indicates the PCM is able to execute code, the code is working, and the checksum is not incorrect (or engineering mode is active). If the light behaves as expected you should stop chasing checksum/bin/ecm issues.
For my own curiousity, did you modify anything in code for the 3 BAR MAP? Using 3 BAR MAP with an unmodified 2 BAR calibration can produce bad results such is vastly incorrect timing and fuel values for the engine.for what it's worth, it's a 1989 Corsica hatchback. Five speed swap, LG5 turbo. LS springs, roller rockers and it's got a three-bar map in it. '730.
Apologize for the gap in time, I've been away for the Easter holiday..
I've gotten back at it, got the noid light set out. I get one flash of the noid light whenever you first turn the key on and crank. Injectors then have no pulse. I unplugged the injector harness at the back of the upper intake, and ran the noid light pre-injectors via a little engineering. Same result, one quick flash, nothing else there after. This points to a wiring issue, no?
I'm going to get out there again first thing in the a.m., start checking the harness over, with the multimeter. Its a healthy harness, and I see no breaks or shorts. I guess I'm not convinced it's still not in the .bin I'm running
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