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Old 23-10-2019, 12:44   #1
nplatenkamp
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Question [Evo X] When pressing brake pedal engine revs to 2000 rpm

Hi,
my last issue is now the above. Engine revs to 2000+ when using brake, throttle position goes to 20 % exact for 1-2 seconds then rpm goes to idle.

Also the throttle is very responsive, 1 mm and engine jumps to 2200 rpm.

I flashed an oem rom 52680022.
Tested Map sensor, air leaks and brake booster all are good.
TPS also is working ok.

Anyone an idea ? I suspect a wiring issue....
Thanks,
Rico
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Old 27-10-2019, 15:32   #2
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Hi, nobody a clue ? I checked all vacuum lines and also disconnected brake booster but
still same issue.
If I press the brake slowly, idle is ok, when releasing and brake light goes off the engine (throttle -> 20%) revs again to 2000-2200 rpm. Then goes back to idle.
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Old 28-10-2019, 09:45   #3
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Have you reset base idle?


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Old 28-10-2019, 10:16   #4
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Hi, no after cold start the idle is ok. As set in the map.
Thanks
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Old 28-10-2019, 14:13   #5
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Hi, I found when unplugging brake light switch (at pedal), the brake issue is gone....

Maybe related to not using AYC ecu ?
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Old 28-10-2019, 21:38   #6
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Quote:
Originally Posted by nplatenkamp View Post
Hi, I found when unplugging brake light switch (at pedal), the brake issue is gone....

Maybe related to not using AYC ecu ?
Brake issue? Don't you mean the rpm increase?

What do you mean by "not using ayc ecu"? Have you disengaged it's functionality? These cars are very complex electronically and even the most basic of actions can trigger unexpected consequences.
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Old 28-10-2019, 22:06   #7
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Yes, I mean idle stays the same. I do not use AYC so did not plug in the ayc ecu.

I will test again tomorrow and if needed I will change ETACS and see.
Thanks
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Old 29-10-2019, 09:48   #8
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My MX5 has what to me is a slightly off putting and irritating feature that results in revs rising as you try to trickle away in first gear even though the throttle pedal hasn't been touched! In this instance I'm advised that it's some kind of pre-programmed anti-stall feature, and I'm pretty sure it's handled totally within the ecu (ie with the trigger being that an initial rpm drop is detected). But I also have a Merc with fly by wire brakes and for one of the features associated with this system to work (called SBC) it specifically needs to know several bits of info from various other seemingly unrelated sub-systems on the car. This can (and did in this SBC failure instance) make a troubleshooting quite tricky.

In your case you have clearly identified a link to the brake pedal switch, but sounds like there must be other conditions that are at play too?

Had the AYC system been disconnected for some time prior to first experiencing the rpm rise phenomenon?
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