Go Back   986 Forum - for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Boxster General Discussions

Reply
 
LinkBack Thread Tools Display Modes
Old 02-20-2011, 08:00 AM   #1
Registered User
 
Join Date: Jan 2008
Location: dc
Posts: 8
Blinking light between Drive and 4th gear on a 986 Tiptronic

Hi,

The below issue is for an 2002 tiptronic.

I recently fixed the secondary air injection system (it had the following codes: p0446, p0410, p1410 and p1130).

This is the second time I fix this problem, and the second time the following happens:

The gear indicator blinks/alternates between "D" and 4th gear. It only does this once the car reaches the normal operating temperature (I tad above 180). The fault code says that it is the "coolant shut off valve." The mechanic had not seen this before, any clues as to what this might be?

Thanks for any input.

IK

ikkaro is offline   Reply With Quote
Old 02-27-2011, 06:28 AM   #2
Registered User
 
Join Date: Feb 2011
Location: France
Posts: 2
Me too!

Dear Ik,
Same phenomena happened to me last week: I left the battery disconnected for almost 2 months, until last week, reconnected, start the car => everything OK.
After a few miles I discovered that blinking light between 4th ear and Drive.
The car is running fine, no problem with the auto gearbox, except the manual mode is not working. I cannot shift gears from the steering wheel.

Any idea?
I read in the forum, maybe the multi-function switch is the culprit?

Help welcome!
JC
ClaudeJS is offline   Reply With Quote
Old 02-27-2011, 07:55 AM   #3
Registered User
 
Lil bastard's Avatar
 
Join Date: Feb 2008
Location: Du Monde
Posts: 2,199
The lights flashing as you describe indicate a fault in the tranny. The coolant shut-off valve is operated electrically, so your fault may be as simple as a blown fuse - check the fuse panel for the appropriate fuse. It could also of course be a faulty shut-off valve. This can be checked by jumping the pins appropriately in the trunk control box - this procedure must be done in order to flush the cooling system. If the valve opens when jumped, it's working properly.

Another somewhat common cause of this fault is a dirty switch at the tranny. This gets exposed to mud, water, dirt and can become inoperable - usually accompanied by an inability to operate the tranny in manual mode. You can pull the switch and clean it up, fairly simple DIY.

Cheers!
__________________
1990 Porsche 964 Carrera 4 Cabriolet
1976 BMW 2002
1990 BMW 325is
1999 Porsche Boxster
(gone, but not forgotten)
http://i933.photobucket.com/albums/a...smiley-003.gif

Never drive faster than your Guardian Angel can fly!
Lil bastard is offline   Reply With Quote
Old 03-05-2011, 12:27 PM   #4
Registered User
 
Join Date: Jan 2008
Location: dc
Posts: 8
Quote:
Originally Posted by Lil bastard
The lights flashing as you describe indicate a fault in the tranny. The coolant shut-off valve is operated electrically, so your fault may be as simple as a blown fuse - check the fuse panel for the appropriate fuse. It could also of course be a faulty shut-off valve. This can be checked by jumping the pins appropriately in the trunk control box - this procedure must be done in order to flush the cooling system. If the valve opens when jumped, it's working properly.

Another somewhat common cause of this fault is a dirty switch at the tranny. This gets exposed to mud, water, dirt and can become inoperable - usually accompanied by an inability to operate the tranny in manual mode. You can pull the switch and clean it up, fairly simple DIY.

Cheers!
Thank you so much for the advise. I am going to the blown fuse first, as the car just had the cooling system flushed (so I assume the shut-off valve should be ok). Will post back with results.

Cheers,

Raul
ikkaro is offline   Reply With Quote
Old 03-12-2011, 01:21 PM   #5
Registered User
 
Join Date: Feb 2011
Location: France
Posts: 2
Problem solved

Maybe useful for all:
With an OBD code reader, I found the code P0740 "Torque Converter Clutch Circuit/Open"
I erased the fault and problem is gone, solved : no more light blinking, everything works perfectly!

So simple as that!

Lesson learnt: OBD code reader is mandaotry!

Thanks to all for the support,

JC
ClaudeJS is offline   Reply With Quote
Old 03-14-2011, 04:44 AM   #6
Registered User
 
Join Date: Dec 2010
Location: Hot Springs Village, Arkansas
Posts: 245
Simply erasing the code may not have corrected the underlying problem. My car is in the shop right now and one of the items is the 0740 code. I am hopeful that a Tiptronic service with fluid and filter replacement will have a positive effect on my car but I really won't know until I drive the car for a while. I hope your car doesn't need any additional work but simply clearing the code might not be enough. My mechanic thinks the Tip fluid gets contaminated with diff fluid and then the torque converter clutch slips. Personally I doubt it. I told him to go ahead and take a fluid sample for lab analysis but I don't know if they can really detect cross contamination or not.

I'm supposed to get my car back early this week and I'll post an update. It would be good news if the Tip service decisively fixed it because that's fairly easy and cheap. Stay tuned, as George Bush the elder used to say.
Dale_K is offline   Reply With Quote
Old 06-27-2011, 07:04 PM   #7
Registered User
 
Join Date: Jun 2011
Location: Australio
Posts: 1
Boxster S Tiptronic fault lamps

Hi, I've just joined this forum - grate source of info.

My 2001 Boxster S tiptronic has similar symptoms: some gearbox slip & alternating fault lamp indications.

I'll have to look up the fault code provided from my dealer but their suggested fix was a gearbox overhaul as they claimed the torque converter was worn and residue evident in pan. I took the car to a transmission specialist who had trouble identifying any problems but we agreed to an oil & filter change and some further fault diagnosis. The specialist indicated no one had removed the pan previously and no evidence of residue from torque converter.

The filter & oil change improved the situation for low speed driving but at higher speeds I still get fault lamps, but not always and no slip, no noises, no fluid loss, in fact no change in performance ie can manual shift as normal.

From this forum & others it seems possible causes include wheel speed sensors, transmission plug/sensor or transmission control unit on boot (trunk) wall.

I hope others out there can sort this one!

Last edited by bcorcoran; 06-27-2011 at 07:07 PM.
bcorcoran is offline   Reply With Quote
Old 05-18-2013, 11:51 PM   #8
Registered User
 
Join Date: May 2013
Location: Nottingham
Posts: 5
Quote:
Originally Posted by Lil bastard View Post
The lights flashing as you describe indicate a fault in the tranny. The coolant shut-off valve is operated electrically, so your fault may be as simple as a blown fuse - check the fuse panel for the appropriate fuse. It could also of course be a faulty shut-off valve. This can be checked by jumping the pins appropriately in the trunk control box - this procedure must be done in order to flush the cooling system. If the valve opens when jumped, it's working properly.

Another somewhat common cause of this fault is a dirty switch at the tranny. This gets exposed to mud, water, dirt and can become inoperable - usually accompanied by an inability to operate the tranny in manual mode. You can pull the switch and clean it up, fairly simple DIY.

Cheers!
Ive got the same flashing D and 4 lights, Where is this tranny switch located to check it?

And which pins need shorting to operate the coolant valve to check that?

Thanks
Malty123 is offline   Reply With Quote
Old 04-15-2019, 07:01 AM   #9
Registered User
 
tonythetiger's Avatar
 
Join Date: Mar 2017
Location: East Coast
Posts: 323
Garage
similar problem and new questions

I will revive this thread rather then start a new one.
2002 tip, 986 S with 80K

Flashing 4th and D after warm up, however transmission works fine and the normal lights come back in a minute or so, go to 4th and D again, etc as I drive. Automatic and manual function fine, just dont get the feedback in the dash lights when its out.

I have heard this could be the transmission’s coolant vacuum valve. Does this circulate coolant through the transmission? That seems to be the simple fix and makes sense.

I had the transmission serviced, new fluid, filter etc about 6 months ago, but the problem didn't completely resolve. Now with the warmer weather, I'm thinking I should iron out this issue.
I have a durametric scanner, but it only shows alarm fault codes (historic, none present now) to be honest, I am not sure I'm using the durametric to its potential, it seems pretty lame when I do the short test on all modules, so I would welcome advice on this as well.
tonythetiger is offline   Reply With Quote
Old 04-16-2019, 08:33 AM   #10
Registered User
 
tonythetiger's Avatar
 
Join Date: Mar 2017
Location: East Coast
Posts: 323
Garage
to add to my question...would a faulty coolant vacuum valve potentially lead to heat issues with the tiptronic, manifesting in the 4th and D flashing?
tonythetiger is offline   Reply With Quote
Old 05-27-2019, 11:21 PM   #11
Registered User
 
Join Date: May 2019
Location: Australia
Posts: 2
Had the same problem with the 'D' and 4th blinking lights once the engine and transmission was at operating temperature, and this was after I changed the coolant valve due to leakage. The problem continued until I started to have gear shifts without any reason, so as a precaution i changed the transmission oil and filter. The lights continued to blink after the oil change. What I did eventually find thorough some troubleshooting was that the transmission selector switch was faulty. I replaced the switch
and have not had a problem since. I have driven several thousand kms since the switch replacement, Blinking lights gone, transmission operating normal.
Note you will need an OBD reader to clear the blinking lights once you have changed the switch.
snottas is offline   Reply With Quote
Old 05-28-2019, 07:57 AM   #12
Registered User
 
tonythetiger's Avatar
 
Join Date: Mar 2017
Location: East Coast
Posts: 323
Garage
Quote:
Originally Posted by snottas View Post
Had the same problem with the 'D' and 4th blinking lights once the engine and transmission was at operating temperature, and this was after I changed the coolant valve due to leakage. The problem continued until I started to have gear shifts without any reason, so as a precaution i changed the transmission oil and filter. The lights continued to blink after the oil change. What I did eventually find thorough some troubleshooting was that the transmission selector switch was faulty. I replaced the switch
and have not had a problem since. I have driven several thousand kms since the switch replacement, Blinking lights gone, transmission operating normal.
Note you will need an OBD reader to clear the blinking lights once you have changed the switch.
the switch is 400 bucks...how did you determine it was a bad switch?
My tranny is shifting fine, BTW, but the fans run and it is acting as if it is slightly overheating. I am trying the coolant valve first, but honestly, I would be surprised if the coolant flowing makes this big of a difference. Still leaning towards faulty thermistor in internal harness as I heard the tranny ran dry for a short period of time with previous owner. (he had the tranny serviced and they forgot to put in fluid afterwards.
tonythetiger is offline   Reply With Quote
Old 05-28-2019, 10:44 PM   #13
Registered User
 
Join Date: May 2019
Location: Australia
Posts: 2
I was able to stop the lights from blinking (4th to D) and the irregular gear changes by minor adjustment of the cable at the switch or at the gear lever. This only temporarily fixed the problem as the next time I went to drive I had the same problem which again could be temporarily fixed by adjustment but with the same outcome until I changed the switch.
Note:- the original problem was the lights blinking which occurred each time I drove the vehicle.
snottas is offline   Reply With Quote
Old 05-29-2019, 08:24 AM   #14
Registered User
 
tonythetiger's Avatar
 
Join Date: Mar 2017
Location: East Coast
Posts: 323
Garage
Quote:
Originally Posted by snottas View Post
I was able to stop the lights from blinking (4th to D) and the irregular gear changes by minor adjustment of the cable at the switch or at the gear lever. This only temporarily fixed the problem as the next time I went to drive I had the same problem which again could be temporarily fixed by adjustment but with the same outcome until I changed the switch.
Note:- the original problem was the lights blinking which occurred each time I drove the vehicle.
im pretty sure mine is related to heat...never does it cold, starts up after driving, happens quicker in hot weather and the fans run incessantly. I have a thermo to check the tranny temp ready for next time I drive the car and Im going to get into the engine bay this weekend to poke around, plus replace the coolant vacuum valve thingy. I expect my fix is the internal harness, but not sure yet.
tonythetiger is offline   Reply With Quote
Old 06-07-2019, 09:03 AM   #15
Registered User
 
Join Date: Nov 2013
Location: Hong Kong
Posts: 20
Hi guys,

In stead of opening new thread I would just continue on this one. I have replaced my Gear Selection Switch about 5 years ago when first time I have the flashing “4” & “P” (Not “D”). Early last year I have a flashing “4” & “D” with code P0740 and I able to just clear the code and continue driving without issue until two days ago.

This time I have flashing “4” & “D” again and the code is 0035 “Multi-function Switch”. I believe this code is from TCU not ECU. Anyobe know what is “Multi-Function Switch” is? Or better yet have the part number for it?

Thx
2001 Boxster S Tip with 100K KM
KuaiThunder is offline   Reply With Quote
Old 07-07-2019, 12:54 AM   #16
Registered User
 
Join Date: Jul 2019
Location: somerset
Posts: 1
Quote:
Originally Posted by snottas View Post
Had the same problem with the 'D' and 4th blinking lights once the engine and transmission was at operating temperature, and this was after I changed the coolant valve due to leakage. The problem continued until I started to have gear shifts without any reason, so as a precaution i changed the transmission oil and filter. The lights continued to blink after the oil change. What I did eventually find thorough some troubleshooting was that the transmission selector switch was faulty. I replaced the switch
and have not had a problem since. I have driven several thousand kms since the switch replacement, Blinking lights gone, transmission operating normal.
Note you will need an OBD reader to clear the blinking lights once you have changed the switch.
hi and thanks for your info regarding the blinking lights etc. I have a 996 (98) and the same thing happened to me a couple of days ago. now I have a question, is it a matter of removing the centre console and simply swapping over the switch?

regards gaz
gazufo is offline   Reply With Quote
Old 07-07-2019, 04:37 AM   #17
1998 Boxster Silver/Red
 
Join Date: Sep 2017
Location: 92262
Posts: 1,735
Quote:
Originally Posted by gazufo View Post
hi and thanks for your info regarding the blinking lights etc. I have a 996 (98) and the same thing happened to me a couple of days ago. now I have a question, is it a matter of removing the centre console and simply swapping over the switch?

regards gaz
Do you own the repair manual?
__________________
1998 Porsche Boxster
1986 BMW 325es
2012 Ford Edge Sport

"Ignore the guilt, and take your turn"
Starter986 is offline   Reply With Quote
Old 07-07-2019, 07:00 AM   #18
Registered User
 
SC-986's Avatar
 
Join Date: Oct 2011
Location: Upstate, SC
Posts: 105
Garage
Quote:
Originally Posted by Starter986 View Post
Do you own the repair manual?
Do you make these condescending comments to increase your post count?
Why not be a little more welcoming for the guys first post - or better yet don’t comment at all if you have nothing productive or informative to offer.
__________________
2002 Boxster base - Seal Grey, 5spd trans.,ROW M030 upgrade
2004 550 Spyder Anniversary Edition, #1541,Tip, TechnoFix DOF IMSB upgrade
SC-986 is offline   Reply With Quote
Old 07-07-2019, 07:26 AM   #19
Registered User
 
tonythetiger's Avatar
 
Join Date: Mar 2017
Location: East Coast
Posts: 323
Garage
Quote:
Originally Posted by SC-986 View Post
Do you make these condescending comments to increase your post count?

Why not be a little more welcoming for the guys first post - or better yet don’t comment at all if you have nothing productive or informative to offer.


I don’t think this is condescending. Starter is pretty chill and always helpful. We all are.

I would look at the switch back by the tranny and make sure it’s well connected and clean. That could help and the manual can guide you.

Welcome


Sent from my iPhone using Tapatalk

tonythetiger is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 08:23 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page