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

Reply
 
LinkBack Thread Tools Display Modes
Old 04-16-2019, 03:41 PM   #1
Registered User
 
tonythetiger's Avatar
 
Join Date: Mar 2017
Location: East Coast
Posts: 323
Garage
flashing 4th and D Tiptronic

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 transmissionís 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.

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 04-16-2019, 03:51 PM   #2
Need For Speed
 
KRAM36's Avatar
 
Join Date: Feb 2013
Location: Funville
Posts: 2,108
Garage
Curious, have you changed the exhaust system on the car? Especially putting in secondary cat delete pipes?
__________________
2003 Boxster S
| 987 Air Box | K&N Air Filter | 76mm Intake Pipe| 996 76mm TB | 997 Distribution T | Secondary Cat Delete Pipes | Borla Muffler | NHP 200 Cell Exhaust Headers |
KRAM36 is offline   Reply With Quote
Old 04-17-2019, 06:20 AM   #3
Registered User
 
tonythetiger's Avatar
 
Join Date: Mar 2017
Location: East Coast
Posts: 323
Garage
Quote:
Originally Posted by KRAM36 View Post
Curious, have you changed the exhaust system on the car? Especially putting in secondary cat delete pipes?
nope, stock exhaust and wondering if the cooling system is integrated with the tranny for cooling and replacing the coolant vacuum valve would assist in cooling transmission.
tonythetiger is offline   Reply With Quote
Old 04-17-2019, 06:51 AM   #4
Registered User
 
Join Date: Mar 2017
Location: Arizona
Posts: 67
Quote:
Originally Posted by tonythetiger View Post
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 transmissionís 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.

would a faulty coolant vacuum valve potentially lead to heat issues with the tiptronic, manifesting in the 4th and D flashing?

That controls the coolant that goes to the trans cooler mounted on the transmission.
Mine broke in half and car had to be towed it's only time. It's also a lot of fun to replace, it's the same type of valve that controls coolant to the heater. Valve is not very expensive.
azlvr is offline   Reply With Quote
Old 04-22-2019, 06:04 AM   #5
Registered User
 
tonythetiger's Avatar
 
Join Date: Mar 2017
Location: East Coast
Posts: 323
Garage
P0710 Transmission temperature sensor
P1823 Pressure Regulator3
P1818 Pressure Regulator2

transmission works normal, recent transmission service (tranny was already exhibiting the flashing lights) and fluid didnt look burnt or anything.

I heard from the previous owner that when he got the car, the tranny was very low on ATF and he had it topped off. (it was not flashing the error lights) Again, I serviced the tranny after a couple of months and noticed the lights, this didnt stop the flashing.

I am considering running a cleaner/flush in the tranny before doing a series of drain/fill operations with the hope that I can clean up the regulators of varnish before I give up and swap this out with an extra tranny I have.

Anybody have a product in mind for this?
tonythetiger is offline   Reply With Quote
Old 04-24-2019, 01:10 PM   #6
Registered User
 
tonythetiger's Avatar
 
Join Date: Mar 2017
Location: East Coast
Posts: 323
Garage
From a user on another forum, good information in here that I have validated as accurate. Sharing for the greater good...

Our gearbox, a ZF type 5HP19FL, is nothing special; it's in oodles of Audis, BMWs and VWs through the same years as the 986 Boxster.
Submerged in the fluid inside is a wiring harness that connects to various bits.
There is a 2-wire thermistor that pokes its head out of this wiring harness; this is the ATF temperature sensor. It would appear that its plastic shrouding breaks down with heat and age, causing the device to malfunction and transmit spurious and/or no signals to the transmission control module.

In my case the removed harness also displayed evidence of similar brittleness with the plastic electrical connectors that connect to the various solenoid valves.

To sum up, if you have

the D-4 flashing thingo happening on your dash AND
the transmission does not go into 'limp' mode during those occurrences then the ATF temperature sensor in your Tiptronic is playing up.

Replace the gearbox internal wiring harness and your problem will be solved. (You have to buy the whole thing as the thermistor is intergral and cannot be purchased separately)
Don't take notice of comments about the transmission fluid level or purity, it's a furphy - in any case you'll have to drop the bottom to access the harness, so you will need to replenish with new fluid.

Happy motoring!

Wiring Harness Part Nos
Porsche 986 325 611 00
ZF 1056 227 046 01
tonythetiger is offline   Reply With Quote
Old 05-18-2019, 10:15 AM   #7
Registered User
 
tonythetiger's Avatar
 
Join Date: Mar 2017
Location: East Coast
Posts: 323
Garage
So, this issue isn't over...I am thinking that I have an overheating transmission, the cooling fans run and they cycle for sometime after i park it. Is there a transmission cooler I should look at? I have noticed that the 2 rubber flaps that my 2000 and 2001 have for trans-axle airflow are missing on this car, for what its worth.
what should I check if I think my transmission is overheating?

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 03:56 PM.


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