badu

Hi guys, I am just a little concerned to see a red "1 UP" message (actually the whole speedometer turns red) when I am doing hard acceleration in the 1st gear in M mode. My car only has 2k miles and I haven't really pushed it too much, but I don't see the same message in any other gears? Is this normal?

GHAZAN

change gear

callmiro

It's called a Shift Light

It will do it in every gear when you get close to the optimal shift point or redline

It's there so you don't have to look at the tach to shift

ZephyrAMG

Change your diaper light.

E500C70

I had to

black-clk500

totally normal, happens to me every time I go WOT
it is a little unnerving, but I don't think it does any damage, I can't believe it took you that long to "see the light"

ZephyrAMG

Welcome back buddy, We missed your sexy ***...

black-clk500

thanks, glad to be back

ZephyrAMG

The weather has gotta to be getting better over there so we expect a full report on your P31 beast as you stretch her legs this spring...!

black-clk500

still have a ton of snow on the ground, I thought it would never stop!
I can't wait to get out there again, it will be like getting a new car all over again

Viper98912

Don't worry, if you continue to bounce it continually off the limiter it'll eventually change itself.

C63newdude

Not on manual mode. It will stay on whatever gear you are.

jvanbrecht

I have not tried it.. but does the limiter not kick in when you hit the maximum redline RPM's
Even true manual clutched vehicles do that, its the self preservation mode that almost every new engine I know of has.....

In case no one has actually hit the limiter, usually you lose all power for a very short period and the rpm's drop, at a certain point, probably around 2 to 3k below redline, you regain power (atleast my VW did that).

Sincity

+1

black-clk500

Thanks Sin, I'll try to keep it clean, no pun intended

MiamiAMG

It's a shift light. It's letting you know that it's time to shift gears! Now!

azadian22

I have noticed when you don't drive the car that hard theshift lights will be at differant points...like after driving normal for a week or more the lights will come on at a lower rpms then when I reset the tcu. Has anyone else notice this? Or did I just think that was happening and not realise it?

khmergod

When I tried it on Manual, braking drops my gears, but it won't shift up unless it bounces off redline too much correct? Letting it shift itself doesn't have a sonic boom effect. I love downshifting...but I get about 5 miles a gallon. And welcome back BLACK CLK! Finally got my car bish!

GHAZAN

there is no tcu reset for our car unless you pull the battery maybe....mine was about 5600-5800krpm today, little low

azadian22

Sorry I thought wheb you reset the ecu,(turn the key, hold the gass ect.) It reset both the tcu and ecu but it must be just the ecu but I'm still almost positve that, that would change the shift points.

jvanbrecht

There is a reset for the TCU, you cannot reset the ECU. TCU is just for the transmission, the ECU controls the entire vehicle..

azadian22

Okay so I was right the first time, I knew one of them can be reset.

bushburninc63

so what is the proper method to reset the tcu? I've read differing answers. Some said it can be done and other said it can't.

Sheep

Take off the start button; use your key to turn to position two (2) just before engine start; fully depress gas for 5-10 seconds; turn the car off and wait for at least 2 minutes.

Sheep

GHAZAN

There is no sneaky reset for these cars with gas pedals or turning keys