 RPM goes to 7750, strange problem |
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 Jan 8, 2013 - 8:25 AM
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 Enthusiast  Joined Oct 25, '11 From Tbilisi Currently Offline Reputation: 3 (100%)  |
Hello guys.
About 1 week ago I got some strange problem. Engine rpm goes to 7750 instead of 7250 and an engine light turns on. I have AEM FIC 6 installed and Apexi Gen 1 RSM. Removed AEM FIC and have same problem. Apexi RSM as I know doesn't have remove rev limiter function. personally I don't think that's it's an apexi problem. What do you think guys? This post has been edited by Red123: Jan 8, 2013 - 8:26 AM -------------------- |
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Jan 8, 2013 - 10:06 AM
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Enthusiast Joined Dec 8, '03 From Lancaster CA Currently Offline Reputation: 6 (100%) |
its definitely not the RSM, its just a REV SPEED METER. the FIC doesn't raise the rev limiter either. im guessing the crystals on the ECU might be going bad.
-------------------- 2001 Celica GT-S Turbo
1997 Supra TT 6speed 1997 Celica 3MZ/1MZ swap 1990 Celica All-Trac |
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Jan 8, 2013 - 10:24 AM
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Enthusiast Joined Oct 25, '11 From Tbilisi Currently Offline Reputation: 3 (100%) |
QUOTE (Smaay @ Jan 8, 2013 - 10:06 AM)  its definitely not the RSM, its just a REV SPEED METER. the FIC doesn't raise the rev limiter either. im guessing the crystals on the ECU might be going bad. Thanks If it's a problem of crystals in ECU , there's no chance to repair it? Should I change an ECU or what? Also can I install MR2 GT-S 1995 ECU just for testing purposes? p.s engine is working fine on that rpm, not a starting problem or any others like that. just rpm goes to 7750. This post has been edited by Red123: Jan 8, 2013 - 10:34 AM -------------------- |
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Jan 8, 2013 - 1:30 PM
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 Enthusiast Joined Feb 23, '12 From Warrior, AL Currently Offline Reputation: 0 (0%) |
Just shift at 7,200?
 It's possible to repair the ECU, but for what that'd cost you could just buy a new one.
-------------------- 2001 Miata LS 5-speed
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Mar 5, 2013 - 9:52 PM
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Enthusiast Joined Oct 25, '11 From Tbilisi Currently Offline Reputation: 3 (100%) |
Can an increased RPM be caused by damaged knock sensor?
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Mar 5, 2013 - 11:32 PM
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 Moderator Joined Nov 5, '07 From New Zealand Currently Offline Reputation: 3 (100%) |
factory ecu? could be a remaped/plug in ecu?
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Mar 6, 2013 - 10:16 AM
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Enthusiast Joined Dec 8, '03 From Lancaster CA Currently Offline Reputation: 6 (100%) |
QUOTE (Red123 @ Mar 5, 2013 - 6:52 PM) Can an increased RPM be caused by damaged knock sensor? no it would be the opposite, the ECU would be in safe mode. i wouldn't worry about it, just shift around 7000 RPMs -------------------- 2001 Celica GT-S Turbo
1997 Supra TT 6speed 1997 Celica 3MZ/1MZ swap 1990 Celica All-Trac |
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Mar 7, 2013 - 12:04 AM
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 Enthusiast Joined Feb 11, '08 From Auckland, New Zealand Currently Offline Reputation: 0 (0%) |
whats telling you 7750rpm? i find it hard to believe the ecu will allow that
-------------------- Mike W
1996 Toyota Celica ST205 GT-FOUR GT2860RS turbine, TiAL mvr44, JE 86.5φ piston, Clutchmasters FX400, APEX P-FC 269awhp / 273ft-lbs |
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Mar 7, 2013 - 10:00 AM
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Enthusiast Joined Oct 25, '11 From Tbilisi Currently Offline Reputation: 3 (100%) |
removed AEM Fic, removed Apexi RSM and still the same RPM.
After that installed 1995 GT-S MR2's ECU, and RPM goes to 7400-7500 not 7750. funny is that when I removed MR2 ecu from my car and installed it in MR2 again, MR2 has the same problem  RPM goes to 7250+. ))) BTW I have a damaged knock sensor, check engine light is on after 3000 RPM and as I read it probably caused by damaged knock sensor. Rusty CODE factory ecu? could be a remaped/plug in ecu? I have AEM FIC installed in my car, but it's the same if I remove AEM. Smaay Thanks. delusionz tachometer is telling. Also Apexi RSM. -------------------- |
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Mar 7, 2013 - 10:06 AM
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Enthusiast Joined Dec 8, '03 From Lancaster CA Currently Offline Reputation: 6 (100%) |
again you are worrying about nothing, when i had an Apexi RSM on my 7th gen, it would hit 8500 sometimes with the stock ECU. and then sometimes it would only hit 8300.
-------------------- 2001 Celica GT-S Turbo
1997 Supra TT 6speed 1997 Celica 3MZ/1MZ swap 1990 Celica All-Trac |
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Mar 7, 2013 - 10:14 AM
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Enthusiast Joined Oct 25, '11 From Tbilisi Currently Offline Reputation: 3 (100%) |
QUOTE (Smaay @ Mar 7, 2013 - 10:06 AM) again you are worrying about nothing, when i had an Apexi RSM on my 7th gen, it would hit 8500 sometimes with the stock ECU. and then sometimes it would only hit 8300. I don't worry about it. I'll shift on max 7K RPM or something, but do you think it's a wiring problem of RSM? -------------------- |
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Mar 7, 2013 - 5:18 PM
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Enthusiast Joined Dec 8, '03 From Lancaster CA Currently Offline Reputation: 6 (100%) |
no the RSM has nothing to do with it.
-------------------- 2001 Celica GT-S Turbo
1997 Supra TT 6speed 1997 Celica 3MZ/1MZ swap 1990 Celica All-Trac |
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Apr 30, 2013 - 5:16 PM
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Enthusiast Joined Oct 25, '11 From Tbilisi Currently Offline Reputation: 3 (100%) |
The check engine problem was solved by replacing a knock sensor.
and on my rpm problem I found this one: https://www.assembla.com/spaces/3SGTE_ECU/w...n_Modifications CODE Standard rev limit is 7400 RPM (The stock rev counter is not that accurate so it's widely reported the rev limit is 7200-7250).
There are 2 places in the standard code that implement the rev limit: By changing the 94h to a higher value, the rev limit can be increased. To calculate the value required take the required rev limit and divide it by 50. For example: 7400 / 50 = 94h 7750 / 50 = 9Bh This post has been edited by Red123: Apr 30, 2013 - 5:17 PM -------------------- |
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