4th gear

Woosh · 06-03-2006, 11:21 AM

Using direct scan, i can see that ECM is stuck in 4th gear all the time, even if i go into park/neutral, both P/N and 4th is still displayed. Where is the 4th gear wire?

Tonka · 06-03-2006, 11:25 AM

You could unplug the four pin connector from the side of the trans, see if the indication goes away--helps to narrow down the problem.

pacecarta · 06-03-2006, 12:38 PM

pin C8 (lt blue) at the ecm to pin B at the trans

but i guess you want a diagram

you have the service manual so turn to section 8a- 21-3

do you have a brf trans ?

Woosh · 06-03-2006, 01:11 PM

Quote:

Originally Posted by pacecarta

you have the service manual so turn to section 8a- 21-3

great thanks!

pacecarta · 06-03-2006, 01:18 PM

heres the trans wiring diagram , its in the trans section of the manual

TurboDave · 06-03-2006, 02:07 PM

Good diagrams. My gues would be, since your 3rd gear indicator isn't stuck on, the wiring's probably still intact, and possibly the connection on the 4th gear pressure switch on the valve body may have come loose.
But that would take a tranny pan pull to verify/fix.
Here's a quick check. Since those switches are N.C. (normally closed) and attached to ground, then just measure pin B at the tranny connector for continuity to ground. I'd bet it's open (not grounded) indicating a "no connection" condition.

gbsean · 06-03-2006, 02:26 PM

would he not just have to drop the pan to check the switches and wires. 3rd gear switch and 4th gear are the same part # but 2 different switches which can be changed without pulling the trans..at least that was what I was told from my last DS file 3rd gear was on and off a # of times and it was reccomended that I change both

pacecarta · 06-03-2006, 02:38 PM

sean he said

Quote:

Originally Posted by TurboDave

But that would take a tranny pan pull to verify/fix.
.

so yep dropping the pan is all thats need to get at the switches

wooshes car is a hybrid of sorts so depending on which trans he has he may have no connection to pin b

gbsean · 06-03-2006, 03:12 PM

ok so what trans does he have if he running DS it has to be an 87 ecm and probally a 200r4

Woosh · 06-03-2006, 07:52 PM

You are right pacecarta, i have 200r4 OZ tranny (olds V8), which only has 4th gear switch.(no 3rd)
Only 3 wires in a tranny plug. But i'll check for ground continuity, that might be the problem, i probably missed that wire somewhere...

TurboDave · 06-04-2006, 07:03 AM

Quote:

Originally Posted by gbsean

would he not just have to drop the pan to check the switches and wires. 3rd gear switch and 4th gear are the same part # but 2 different switches which can be changed without pulling the trans..at least that was what I was told from my last DS file 3rd gear was on and off a # of times and it was reccomended that I change both

Yes, I mearly mentioned using a meter to check the wire first, before having to go through the incredibly messy hassle of pulling the pan.

Woosh · 06-04-2006, 08:34 AM

Quote:

Originally Posted by TurboDave

Yes, I mearly mentioned using a meter to check the wire first, before having to go through the incredibly messy hassle of pulling the pan.

heeheh, i installed drain plug last time i had to change fluid, should be easier now!

gbsean · 06-04-2006, 07:30 PM

Quote:

Originally Posted by pacecarta

sean he said

so yep dropping the pan is all thats need to get at the switches

wooshes car is a hybrid of sorts so depending on which trans he has he may have no connection to pin b

i missed the "pan" part sorry read it as pull the trans...

06-03-2006, 11:21 AM	#1 (permalink)
Woosh Unregistered Abuser Join Date: Aug 2005 Location: ON Posts: 421	4th gear Using direct scan, i can see that ECM is stuck in 4th gear all the time, even if i go into park/neutral, both P/N and 4th is still displayed. Where is the 4th gear wire? __________________ 12.97 @ 105 1.85 60ft stock turbo

06-03-2006, 11:25 AM	#2 (permalink)
Tonka Registered User Join Date: May 2001 Location: Western ND Posts: 486	You could unplug the four pin connector from the side of the trans, see if the indication goes away--helps to narrow down the problem. __________________ Troy best 1/4: best 1/8: 7.32@93.4mph, 1.64 60ft (22psi, 18 deg)

06-03-2006, 12:38 PM	#3 (permalink)
pacecarta MAGNABUICK.com .. NJ rep Join Date: Oct 2004 Posts: 2,335	pin C8 (lt blue) at the ecm to pin B at the trans but i guess you want a diagram you have the service manual so turn to section 8a- 21-3 do you have a brf trans ? __________________ paul the 86 10.41, the 87 11.50 http://videos.streetfire.net/video/e...8c013e4547.htm Last edited by pacecarta : 06-03-2006 at 12:59 PM.

06-03-2006, 01:18 PM	#5 (permalink)
pacecarta MAGNABUICK.com .. NJ rep Join Date: Oct 2004 Posts: 2,335	heres the trans wiring diagram , its in the trans section of the manual __________________ paul the 86 10.41, the 87 11.50 http://videos.streetfire.net/video/e...8c013e4547.htm

06-03-2006, 02:07 PM	#6 (permalink)
TurboDave Cell Phone Doc Join Date: Sep 2000 Location: Seymour, TN Posts: 1,536	Good diagrams. My gues would be, since your 3rd gear indicator isn't stuck on, the wiring's probably still intact, and possibly the connection on the 4th gear pressure switch on the valve body may have come loose. But that would take a tranny pan pull to verify/fix. Here's a quick check. Since those switches are N.C. (normally closed) and attached to ground, then just measure pin B at the tranny connector for continuity to ground. I'd bet it's open (not grounded) indicating a "no connection" condition. __________________ TurboDave EWCS(SW) USN ret.(1965-1988) My Photo Gallery Email Us Sevierville, TN TranslatorPro MAFless fuel, spark and boost management 86 GN11.67@117.51(MAFTPro on speed density w/boost & fuel pump control/Extender Pro,PLX-WB) (original owner) 87 GN 12.95@105.50(Stock) (second owner) 84 Z28 L69 (original owner) 01 Excursion LTD TTS"race" chip 7.3L PSD(power stroke diesel) Turbo 4X2 08 Honda Accord EX-L, 270HP 3.5 V6

06-03-2006, 02:26 PM	#7 (permalink)
gbsean 1 of 64,000,000 Join Date: Jul 2005 Location: Flanders, N.J. Posts: 10,656	would he not just have to drop the pan to check the switches and wires. 3rd gear switch and 4th gear are the same part # but 2 different switches which can be changed without pulling the trans..at least that was what I was told from my last DS file 3rd gear was on and off a # of times and it was reccomended that I change both __________________ 11.599 @ 119.91 eat that Ferret Joe and JoeNational Tuning in Progress Sean Ryder Buick Performance Group Vice-Chairman www.buickperformancegroup.com see thread for Engine Specs http://www.turbobuicks.com/forums/wa...tml#post680751 happy now Rich

06-03-2006, 03:12 PM	#9 (permalink)
gbsean 1 of 64,000,000 Join Date: Jul 2005 Location: Flanders, N.J. Posts: 10,656	ok so what trans does he have if he running DS it has to be an 87 ecm and probally a 200r4 __________________ 11.599 @ 119.91 eat that Ferret Joe and JoeNational Tuning in Progress Sean Ryder Buick Performance Group Vice-Chairman www.buickperformancegroup.com see thread for Engine Specs http://www.turbobuicks.com/forums/wa...tml#post680751 happy now Rich

06-03-2006, 07:52 PM	#10 (permalink)
Woosh Unregistered Abuser Join Date: Aug 2005 Location: ON Posts: 421	You are right pacecarta, i have 200r4 OZ tranny (olds V8), which only has 4th gear switch.(no 3rd) Only 3 wires in a tranny plug. But i'll check for ground continuity, that might be the problem, i probably missed that wire somewhere... __________________ 12.97 @ 105 1.85 60ft stock turbo Last edited by Woosh : 06-03-2006 at 10:11 PM.

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