Research Qs on my 91 16V AT valve body....LONG and semi-Technical
 

First off........is anyone selling an automatic transmission valve body for
me to examine? <g>

How much power is supplied to the solenoids and AT fluid temperature inside
of the transmission?
Is it possible to activate the solenoids at the valve body's wiring plug
with an external power supply to check the operation of the individual
solenoids?

From my testing of the wiring, I did a test of the valve body wiring at the
transmission plug.
I got a slightly high reading of 70 and 68 Ohms for Solenoids #2 and #4
(should be 55-65 Ohms)
I will also have to recheck #6 solenoid and I wonder why it uses a different
power supply pin from everything else inside of the valve body even the AT
fluid temp sensor. AND THAT IS THE ONLY SOLENOID NOT CREATING A DTC.
Is this correct??? I kinda want to imagine what is happening before I pull
out the valve body.

(Total of 10 pins/terminals at the Valve Body Wiring Plug)

Solenoids
1-TCM pin 22
2-TCM pin 23
3-TCM pin 3
4-TCM pin 2
5-TCM pin 24
6-TCM pin 25
7-TCM pin 21

1 pin - ATF temperature sensor uses TCM pins 30 +31 (TCM pin 31 is not
recorded in the Bentley wiring diagram)
2 pins used for power supply at the Valve Body Wiring Plug both originate
from TCM pin 18
(#6 solenoid uses 1 of the these pins, while all the other solenoids
and temperature sensor uses the other)
TCM pin 18 supplies the power to the solenoids and the other pins ground
them out as needed.

Here are the results of my DTCs that force my trans to be put in 3H (Limp
Mode)

VAG-COM Version: Release 303.1

Control Module Part Number: 096 927 731 M
Component and/or Version: DIGIMAT 0811
Software Coding: Diagnose VW
Work Shop Code:
7 Faults Found:
00258 - Solenoid Valve 1 (N88)
36-00 - Open Circuit
00260 - Solenoid Valve 2 (N89)
36-00 - Open Circuit
00262 - Solenoid Valve 3 (N90)
36-00 - Open Circuit
00264 - Solenoid Valve 4 (N91)
36-00 - Open Circuit
00266 - Solenoid Valve 5 (N92)
36-00 - Open Circuit
00270 - Solenoid Valve 7 (N94)
36-00 - Open Circuit
00300 - Transmission Fluid Temp. Sensor (G93)
34-00 - No Malfunction Detected

Dave, you oughtta copy this entire post and paste it into a message on
the tech auto tranny forum on vortex, if you haven't already. Hopefully
Tantalus will read and respond. He knows all. Hope you figure out your
troubles (saw your posts in yahoo, too).

'luck - Chris

One out of many daves wrote:
> First off........is anyone selling an automatic transmission valve body for
> me to examine? <g>
>
> How much power is supplied to the solenoids and AT fluid temperature inside
> of the transmission?
> Is it possible to activate the solenoids at the valve body's wiring plug
> with an external power supply to check the operation of the individual
> solenoids?
>
> From my testing of the wiring, I did a test of the valve body wiring at the
> transmission plug.
> I got a slightly high reading of 70 and 68 Ohms for Solenoids #2 and #4
> (should be 55-65 Ohms)
> I will also have to recheck #6 solenoid and I wonder why it uses a different
> power supply pin from everything else inside of the valve body even the AT
> fluid temp sensor. AND THAT IS THE ONLY SOLENOID NOT CREATING A DTC.
> Is this correct??? I kinda want to imagine what is happening before I pull
> out the valve body.
>
> (Total of 10 pins/terminals at the Valve Body Wiring Plug)
>
> Solenoids
> 1-TCM pin 22
> 2-TCM pin 23
> 3-TCM pin 3
> 4-TCM pin 2
> 5-TCM pin 24
> 6-TCM pin 25
> 7-TCM pin 21
>
> 1 pin - ATF temperature sensor uses TCM pins 30 +31 (TCM pin 31 is not
> recorded in the Bentley wiring diagram)
> 2 pins used for power supply at the Valve Body Wiring Plug both originate
> from TCM pin 18
> (#6 solenoid uses 1 of the these pins, while all the other solenoids
> and temperature sensor uses the other)
> TCM pin 18 supplies the power to the solenoids and the other pins ground
> them out as needed.
>
> Here are the results of my DTCs that force my trans to be put in 3H (Limp
> Mode)
>
> VAG-COM Version: Release 303.1
>
> Control Module Part Number: 096 927 731 M
> Component and/or Version: DIGIMAT 0811
> Software Coding: Diagnose VW
> Work Shop Code:
> 7 Faults Found:
> 00258 - Solenoid Valve 1 (N88)
> 36-00 - Open Circuit
> 00260 - Solenoid Valve 2 (N89)
> 36-00 - Open Circuit
> 00262 - Solenoid Valve 3 (N90)
> 36-00 - Open Circuit
> 00264 - Solenoid Valve 4 (N91)
> 36-00 - Open Circuit
> 00266 - Solenoid Valve 5 (N92)
> 36-00 - Open Circuit
> 00270 - Solenoid Valve 7 (N94)
> 36-00 - Open Circuit
> 00300 - Transmission Fluid Temp. Sensor (G93)
> 34-00 - No Malfunction Detected
>
>

thanks Chris
I will try that route also. ;-)
later,
dave
(One out of many daves)


"starburst" > wrote in message
...
> Dave, you oughtta copy this entire post and paste it into a message on the
> tech auto tranny forum on vortex, if you haven't already. Hopefully
> Tantalus will read and respond. He knows all. Hope you figure out your
> troubles (saw your posts in yahoo, too).
>
> 'luck - Chris
>
> One out of many daves wrote:
>> First off........is anyone selling an automatic transmission valve body
>> for
>> me to examine? <g>

Just in case I did not close this thread, and someone was waiting for the
solution...............

It was damaged insulation allowing water and dirt to create electrical
problems with the auto trans shifting correctly.
http://vwdoc1.tripod.com/personal/in...into_trans.jpg

FIXED now, but I removed the Valve Body harness to thoroughly inspect it.
http://vwdoc1.tripod.com/personal/in...ess_sealed.jpg

The Valve Body was fine!

later all,
dave
(One out of many daves)

i bett you have a messed up round 10 pins plug at the end of the wiring
loom...
i should know trust me!

Well thanks for the reply
It was bad/broken insulation causing a change in electrical resistance
inside of the Valve Body Harness.
After finding the problem, cleaning up the area and sealing it with some
silicone..............ALL IS FINE AGAIN.
later,
dave
(One out of many daves)

"avishaym" > wrote in message
lkaboutautos.com...
>i bett you have a messed up round 10 pins plug at the end of the wiring
> loom...
> i should know trust me!
>