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| Shift light stays on in deceleration, stumbe (Page 2/2) |
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olejoedad
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MAR 22, 07:55 PM
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Patrick, there is no feedback from the drivetrain to the ECU relative to what gear a manual transmission is in.
None at all.
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PatrickTRoof
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MAR 23, 02:24 PM
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| quote | Originally posted by olejoedad:
Patrick, there is no feedback from the drivetrain to the ECU relative to what gear a manual transmission is in.
None at all. |
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I realize this. But like you said, it's in the chip.
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PatrickTRoof
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MAR 25, 05:04 PM
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Update: The issue kept returning, no matter how I fiddled with the connector. I think the connector got messed up from changing the ICM a whole bunch of times thanks to the distributor making me think the ICM was bad (see my other post: http://www.fiero.nl/forum/Forum2/HTML/144767.html ). This was annoying, as I had only recently replaced the original connector with a replacement.
Luckily I had ordered an extra connector a while ago. I cut out the other one, spliced this one in, and haven't had the issue since (knocks on wood, kisses the rabbit's foot and throws salt over the shoulder).
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Dennis LaGrua
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MAR 26, 03:14 PM
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| quote | Originally posted by olejoedad:
Patrick, there is no feedback from the drivetrain to the ECU relative to what gear a manual transmission is in.
None at all. |
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Absolutely, I believe the ECM uses a comparison between speed and RPM's to energize the shift light. In view of this there may be different prom chips that define those speed v RPM points relative to the FDR's. Last I looked the shift light can be turned on and off by unchecking the feature flag in the program. ------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "
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olejoedad
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MAR 28, 06:19 PM
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Shift light actuation is most likely due to MAP sensor vacuum signal.
I'm on vacation and away from my factory service manuals, so that is conjecture at this point.
There is probably and answer in the Drivability section.
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PatrickTRoof
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MAR 30, 05:21 PM
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No worries, I fixed it by replacing the 4-pin connector to the ICM.
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olejoedad
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MAR 30, 05:34 PM
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PatrickTRoof
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APR 02, 07:40 PM
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Welp, I thought I fixed it. I drove the car to work today, and it started in with it again. I got to work, unplugged the 4 pin connector, plugged it back in and drove it, no problem.
On my break I went for a drive. It was fine for a few minutes, then started acting up again. I'm out of ideas.
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PatrickTRoof
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APR 03, 10:27 PM
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This is going to be one of those gremlin issues that comes and goes, driving me crazy. I'm leaning toward the TPS now.
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PatrickTRoof
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APR 05, 07:16 AM
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I replaced the TPS. I don't want to jinx myself, but yeah..... 
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