Jump to content
The mkiv Supra Owners Club

Warning light coming on after boost


neilp9876

Recommended Posts

Its just started this morning, but after overtaking someone the triangle warning light came on about half a second after letting off the gas. I tried it a couple of times after that and it did it again but not every time.

 

Nothing sounds untoward and it all feels fine. Doesn't do it if i brake hard though so it may not be levels.

 

Anyone have any thoughts as to anything common? is there an easy way to read the error codes?

Link to comment
Share on other sites

Oil level and brake fluid is ok, PAS level looks to be at the top. Autobox level maybe low though.

 

Funny thing is though that the car hasnt really been used since it did a trackday a month ago and it didn't show up any errors on the track.

 

Its the warning triangle and the small "handbrake warning light", I think thats a general light though isnt it?

Link to comment
Share on other sites

Oil level and brake fluid is ok, PAS level looks to be at the top. Autobox level maybe low though.

 

Funny thing is though that the car hasnt really been used since it did a trackday a month ago and it didn't show up any errors on the track.

 

Its the warning triangle and the small "handbrake warning light", I think thats a general light though isnt it?

 

The one in the middle and the one at the bottom or just the triangle in the middle ?

 

If it's both then it's a handbrake issue, possibly a faulty sensor ?

Link to comment
Share on other sites

The one in the middle and the one at the bottom or just the triangle in the middle ?

 

If it's both then it's a handbrake issue, possibly a faulty sensor ?

 

Both, the big one in the middle and the handbrake warning light. Surely the big exclamation mark in the middle doesnt come on just because the handbrake is on though does it?

Link to comment
Share on other sites

Could be fuel cut if it's going over 1 bar. The weather's colder now, so will make the car boost higher, and also, if you were going uphill, the engine would be working harder, so that may show it up quicker.

 

Mine goes slightly over 1 bar if it's cold enough, or I'm going up a hill. It's never jerked as though the fuel's cutting out, but a few warning lights come on for about 5 seconds.

 

Edit: If the car has a FCD, or maybe something has gone wrong with the FCD.

Link to comment
Share on other sites

Could be fuel cut if it's going over 1 bar. The weather's colder now, so will make the car boost higher, and also, if you were going uphill, the engine would be working harder, so that may show it up quicker.

 

Mine goes slightly over 1 bar if it's cold enough, or I'm going up a hill. It's never jerked as though the fuel's cutting out, but a few warning lights come on for about 5 seconds.

 

That wouldn't make the handbrake light come on though.

Link to comment
Share on other sites

Could be fuel cut if it's going over 1 bar. The weather's colder now, so will make the car boost higher, and also, if you were going uphill, the engine would be working harder, so that may show it up quicker.

 

Mine goes slightly over 1 bar if it's cold enough, or I'm going up a hill. It's never jerked as though the fuel's cutting out, but a few warning lights come on for about 5 seconds.

 

Edit: If the car has a FCD, or maybe something has gone wrong with the FCD.

 

The warnings are coming on after I stop using the boost so I don't think its the FCD or fuel cut. Its always been happy boosting up to 1.2 bar and its turned down at the moment, the controller is showing it at most getting to 1.03.

 

Is there an easy way to read the diagnostic errors?

Link to comment
Share on other sites

I believe there is a way to do it but I can't remember how, will do a search.

 

here http://www.mkivsupra.net/vbb/showthread.php?35920-How-To-Check-the-diagnostics-codes&highlight=reading+error+codes

 

Thanks for that.

 

There are no errors stored in the ECU. Does anyone know if the autobox has its own diagnostic port?

 

(And I will search myself for the answer this time!)

Link to comment
Share on other sites

Not that I know that much but my guess would be loose wire on the handbrake sensor / faulty sensor.

 

Silly question but are you sure the handbrake was all the way off ? Has it done it since ?

 

I actually tried pulling the handbrake on at the time, the handbrake light comes on and off with the handbrake so I figured it was fine. I didnt recall the big exclamation mark coming on with the handbrake though but I will check that again.

 

It only did it lifting off after accelerating hard, even then it didnt do it every time. (It was a bit slippy this morning to do to much playing).

Link to comment
Share on other sites

I have this problem also. Would both lights come up if the transmssion fluid is low also? I have a new box and filled up with fluid but cant get a proper reading on the dip stick.

 

Not sue what warning lights come on for the gearbox, but to measure the oil the engine has to be running and you should move the selector through the gears before looking at the dipstick.

Link to comment
Share on other sites

Not sue what warning lights come on for the gearbox, but to measure the oil the engine has to be running and you should move the selector through the gears before looking at the dipstick.

 

Yeah engine was running but only getting a cold reading. But its hard to tell as one side is dry and the other side has fluid on.

Link to comment
Share on other sites

i have the same problem also occurred about two weeks ago. Was trying my supra on the motorway drove full boost when the lights came up, and pushed the breakpedal a little immediately it's gone out. After this i couldn't reproduce thus failure, but in the latter time it's succedded. I thought lot of things but neither came in. For example: it's necessary to build in some BPU parts(FCD, downpipe), because i turned up 1.2bar the pressure to the test. I thought also the break fluid and the transmission fluid are low. I saw yesterday the breakfluid level and diagnosed the fluid little up above the min line. The transmission fluid was OK. there is still the direkt filters may be didn't clear long since but drow fast this idea. In this week im trying to fill after break fluid and waiting the effect.

Link to comment
Share on other sites

i have the same problem also occurred about two weeks ago. Was trying my supra on the motorway drove full boost when the lights came up, and pushed the breakpedal a little immediately it's gone out. After this i couldn't reproduce thus failure, but in the latter time it's succedded. I thought lot of things but neither came in. For example: it's necessary to build in some BPU parts(FCD, downpipe), because i turned up 1.2bar the pressure to the test. I thought also the break fluid and the transmission fluid are low. I saw yesterday the breakfluid level and diagnosed the fluid little up above the min line. The transmission fluid was OK. there is still the direkt filters may be didn't clear long since but drow fast this idea. In this week im trying to fill after break fluid and waiting the effect.

 

I think if your brake fluid is near the minimum then it will be that causing the warning. Mine has to be at the max level and maybe slightly above.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. You might also be interested in our Guidelines, Privacy Policy and Terms of Use.