I have a serious engine problem

Mike · 07-31-2010, 11:52 PM

I think I know the problem, but I am sharing my friends car for the track day anyways.

We came back from the awards dinner and my brake lights were on, on the trailer. They were on earlier, but I thought it was the exit/entry sentry lights,.

I also know that you can't power brake this car without pulling the abs fuse. brakes on, engine wont rev, period

I think my brake light switch or brake pressure switch has failed. that would explain no codes and cut power

fullmonty · 08-01-2010, 12:06 AM

Quote:

Originally Posted by Mike

I think I know the problem, but I am sharing my friends car for the track day anyways.

We came back from the awards dinner and my brake lights were on, on the trailer. They were on earlier, but I thought it was the exit/entry sentry lights,.

I also know that you can't power brake this car without pulling the abs fuse. brakes on, engine wont rev, period

I think my brake light switch or brake pressure switch has failed. that would explain no codes and cut power

Damn that would be a helluva thing

Chris@FsP · 08-01-2010, 04:20 PM

Quote:

Originally Posted by Mike

I think I know the problem, but I am sharing my friends car for the track day anyways.

We came back from the awards dinner and my brake lights were on, on the trailer. They were on earlier, but I thought it was the exit/entry sentry lights,.

I also know that you can't power brake this car without pulling the abs fuse. brakes on, engine wont rev, period

I think my brake light switch or brake pressure switch has failed. that would explain no codes and cut power

Could like a faulty relay. Hope you get it all worked out!

1slow370 · 08-01-2010, 04:55 PM

think it could be another ipdm the seemed to be faulty a while ago but then people stopped hearing about them.

Mike · 08-02-2010, 09:50 PM

nope, it was the brake switch. Stopped by Gwinnett Place Nissan on the way home today, and the mechanic came out and looked at it on the trailer, and the switch was out of adjustment. 5 minutes with a wrench under the dash and he fixed it, we didn't even do any paperwork or anything.

Although, the parts manager, who is a friend of mine said they have been seeing a fairly large number of switch failures lately at Nissan on the Zs.

semtex · 08-02-2010, 09:59 PM

Thanks for sharing the fix, Mike! This is good info.

PapoZalsa · 08-02-2010, 10:12 PM

Good you found the problem!

Jordo! · 08-02-2010, 11:34 PM

Huh? I don't get why the brake switch would cause the problems you were having with TPS readings

Did the ECU think the brake was fully depressed when it wasn't?

Mike · 08-03-2010, 12:17 AM

Quote:

Originally Posted by Jordo!

Huh? I don't get why the brake switch would cause the problems you were having with TPS readings

Did the ECU think the brake was fully depressed when it wasn't?

yes, the 350 and 370 both have this feature programmed in that says if you are braking, there is no reason you should also be accelerating, so it won't let the throttle open more than 15% if the brakes are applied. With the switch sending the signal that the brakes are on, it was restricting the throttles.

Anyone that drag races these with slicks knows they have to pull the abs fuse to power brake it and do a burn out. Try it sometime without doing that, the car won't do it.

Jeffblue · 08-03-2010, 12:44 AM

Quote:

Originally Posted by Mike

yes, the 350 and 370 both have this feature programmed in that says if you are braking, there is no reason you should also be accelerating, so it won't let the throttle open more than 15% if the brakes are applied. With the switch sending the signal that the brakes are on, it was restricting the throttles.

Anyone that drag races these with slicks knows they have to pull the abs fuse to power brake it and do a burn out. Try it sometime without doing that, the car won't do it.

how do people heal toe with this feature?

HKYStormFront · 08-03-2010, 12:57 AM

Quote:

Originally Posted by Jeffblue

how do people heal toe with this feature?

you don't need hardly any throttle to rev the engine with the clutch in and besides, with the rev match shifting the 370 does, you don't need it anyway.

that sucks you didn't get to drive your own car mike but at least bryan let you take some laps in his. i'm hoping to get some seat time in the beast at the next A/V track weekend coming up

Jordo! · 08-03-2010, 01:51 AM

Quote:

Originally Posted by Mike

yes, the 350 and 370 both have this feature programmed in that says if you are braking, there is no reason you should also be accelerating, so it won't let the throttle open more than 15% if the brakes are applied. With the switch sending the signal that the brakes are on, it was restricting the throttles.

Anyone that drag races these with slicks knows they have to pull the abs fuse to power brake it and do a burn out. Try it sometime without doing that, the car won't do it.

Huh. So no brake-stand launches for the autos then...?

WarmAndSCSI · 08-03-2010, 03:15 AM

Quote:

Originally Posted by Jordo!

Huh. So no brake-stand launches for the autos then...?

Indeed. I'm no noob to launching or doing a burnout in an automatic, so we took the Z out to the middle of the desert (literally) and I tried a few burnouts/launches. As Mike describes, as soon as you apply throttle while braking, the engine cuts power. I was able to get maybe 1.5 sec of brake-torquing before the engine cut power. Needless to say, no burnouts were achieved that day.

It actually makes for a very poor launch...

Jordo! · 08-03-2010, 06:27 AM

Quote:

Originally Posted by WarmAndSCSI

Indeed. I'm no noob to launching or doing a burnout in an automatic, so we took the Z out to the middle of the desert (literally) and I tried a few burnouts/launches. As Mike describes, as soon as you apply throttle while braking, the engine cuts power. I was able to get maybe 1.5 sec of brake-torquing before the engine cut power. Needless to say, no burnouts were achieved that day.

It actually makes for a very poor launch...

Well that sucks.

I guess it's just as well since we have no way of checking to see if the ATF is burnt from doing that...

I was able to lay wheels pretty nicely just flooring with the traction control off tho

Chris@FsP · 08-03-2010, 11:17 AM

You could always install a switch on the brake wire going into the ecu to disable that function when racing.

07-31-2010, 11:52 PM	#16 (permalink)
Mike The370Z.com Sponsor Join Date: Jun 2009 Location: Loganville, GA Posts: 5,944 Drives: 370z Rep Power: 2186	I think I know the problem, but I am sharing my friends car for the track day anyways. We came back from the awards dinner and my brake lights were on, on the trailer. They were on earlier, but I thought it was the exit/entry sentry lights,. I also know that you can't power brake this car without pulling the abs fuse. brakes on, engine wont rev, period I think my brake light switch or brake pressure switch has failed. that would explain no codes and cut power __________________ NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z Porsche: 93 968 / 23 Macan GTS / 93 968

08-01-2010, 04:55 PM	#19 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	think it could be another ipdm the seemed to be faulty a while ago but then people stopped hearing about them. __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

08-02-2010, 09:50 PM	#20 (permalink)
Mike The370Z.com Sponsor Join Date: Jun 2009 Location: Loganville, GA Posts: 5,944 Drives: 370z Rep Power: 2186	nope, it was the brake switch. Stopped by Gwinnett Place Nissan on the way home today, and the mechanic came out and looked at it on the trailer, and the switch was out of adjustment. 5 minutes with a wrench under the dash and he fixed it, we didn't even do any paperwork or anything. Although, the parts manager, who is a friend of mine said they have been seeing a fairly large number of switch failures lately at Nissan on the Zs. __________________ NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z Porsche: 93 968 / 23 Macan GTS / 93 968

08-02-2010, 09:59 PM	#21 (permalink)
semtex A True Z Fanatic Join Date: Jan 2009 Location: Behind enemy lines Age: 54 Posts: 5,995 Drives: People to drink Rep Power: 32	Thanks for sharing the fix, Mike! This is good info. __________________ "There are no small accidents on this circuit." -- Ayrton Senna 316.8whp & 248 ft/lbs (Dyno Dynamics) \| 319whp & 256 ft/lbs (DynoJet) (04/23/10) Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

08-02-2010, 10:12 PM	#22 (permalink)
PapoZalsa A True Z Fanatic Join Date: Nov 2009 Location: Not in Sunny Florida Posts: 6,358 Drives: 16 Nismo w/Tech Pack Rep Power: 4500	Good you found the problem! __________________ 2009 370Z MB Base w/Sport Package 6MT Modshack's Custom Air Intakes /3M Clear Bra/ Illuminated Kick Plates / F. I CBE w/12" resonators / EVO-R Front Lip / Rear Hatch Wing / Tein S-Tech Springs /Ilegal Tint in the Rep. of VA/4x20mm Z1 Spacers/ Vinyl Roof/Liquid Carbon Designs

08-02-2010, 11:34 PM	#23 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 418	Huh? I don't get why the brake switch would cause the problems you were having with TPS readings Did the ECU think the brake was fully depressed when it wasn't? __________________ Enjoy it. Destroy it.

08-03-2010, 11:17 AM	#30 (permalink)
Chris@FsP Enthusiast Member Join Date: Dec 2009 Location: Tulsa, OK Posts: 430 Drives: 2008 350Z TT Rep Power: 368	You could always install a switch on the brake wire going into the ecu to disable that function when racing.

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