Cruise control malfunction
 

Just picked up my FT86 last week, and the cruise control died over the weekend. After a couple of days it started working again. The check engine light was also coming on, but it seems okay now too. The dealer replaced some solonoid before delivery as there was a recall related to the cam gear which, as far as I can tell, caused the check engine light to come on incorrectly. He said the fix for that was to replace the solonoid (easy) or replace the cam gear (not so easy), and the new solonoid seemed to fix the problem.

Has anyone had a cruise control problem yet? or a check engine light problem? Needless to say this is very disappointing. Hope I don't have a lemon. :sigh:

Cruise control will not work if the car is throwing a code (CEL).

Have you taken a look at issues/warranty/recal/tsb page?
There are 8 CEL threads just on the first page.
http://www.ft86club.com/forums/forumdisplay.php?f=72

CEL just kicked in yo!

Cruise control doesn't work in limp mode.

This is kind of crazy to me. Why should a CEL matter as far as the cruise is concerned? Are you going to drive sixty-five differently just b/c of a light?

Wait...Am I hearing this correctly?...You just got the car last week and you're already using the Cruise Control feature before the car/engine is even broken in?...

Owner's manual clearly states not to stay in constant engine speed (RPM) before the stated mileage.

engine speed during break in
 

My owner's manual says not to drive at the same speed "for a long time" during break in. I did vary the speed some. Got the car on Aug 30 and it was broken in by Sep 2 :) The problem started during break in (around 700 miles) and continued until around 1300 miles.

I waz broken in, in 3 days lol

I had a blast -- still am now that the CEL isn't coming on.

Good to know
 

Thanks, that's a relief. At least the cruise control isn't messed up too.

CEL light comes on
 

Thanks, very helpful. Evidently this is a big problem.

The only thing that could be messed up is the cruise control buttons. There are no extra parts to run the cruise control - the car already has an electronic throttle so no extra solenoids or actuators are needed for the computer to control the throttle.

Your car is under warranty, get it fixed for free at the dealer...

-Charlie

Where is the link to the SCion TSB for the VVT control valve?

All I see are words on the form and no link to factory / dealer TSB's or recalls.

The only TSB i've seen here around is the one from Subaru. But someone said that it was taken down and revised?

Thread revival...

I just installed an AEM wideband and removed the O2 sensor downstream of the cat in order to prep for FI. Of course the CEL came on but consequently noticed that cruise control doesn’t work anymore.

Does a CEL really disable cruise control??


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yes

Well yes and no. Depends on what the CEL is for.

Any idea as to the reasoning and logic behind disabling cruise control when there’s a catalyst inefficiency?


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It thinks the inefficacy is a failure of the system and is trying to protect the engine from damage. The system doesn't know why the issue occurred it just knows it did.
Pretty much any CEL that could cause damage triggers what is nicknamed "limp mode".

@kimcheefists
This. It's a liability issue for toyota and subaru for the P0420 codes and other catalyst codes. Because your AFR data reads "incorrect'" now and the pre cat and post cat O2 data is also "incorrect" letting cruise control run would be dangerous, it could very well go full throttle and lean the car out, or make its acceleration choppy and sporadic in an effort to counter the engine issue. Making a cruise control system that takes into account engine codes and does a limp home cruise control type deal would be very difficult and also defeat the purpose of being efficient.

This is why your tuner will disable the P0420 code when you finish the FI install, or when others install things like a header.