Volvo 2.5T AWD 2003 Automatic delay 3 to 4

[firstv70volvo]

**********************************************************************************************************************
Hello again
Did the measurement and I got 19.5mm from the edge of the wood to the marking I did with a saw blade.
This was with the piston pushed all the way in and pushing against the small flat surface

Subtracting 12mm from the 19.5mm = 7.5mm which is .74mm greater than the 6.76mm max travel spec.

Assuming all the measurements are accurate and the method is sound this measurement is saying there's too much travel for the servo and likely the 3rd gear brake band is worn. They do have different length servo pins to bring this travel within spec. What's the ID marking on the tip of your servo pin? Number of rings? A pin with no rings (ID mark) is a servo pin 76.2mm in length, four rings is a pin 78.2mm in length. There's also servo pins with 1,2 and 3 ID marks.

What I don't know is if the 0.74mm greater than spec servo travel is causing the delay in shifting or not but you could try a longer servo pin to bring back the servo travel into the correct spec range.

Looks like GM sells the servo kits and these parts look identical to the volvo servo pin but no guarantee. You would need a pin with 2 to 3 more ID rings.

GM sells servo kits for the different length pins
4ID marks 78.2mm
https://www.carid.com/acdelco/genuine-g ... 20760.html
3 ID marks 77.7mm
https://www.carid.com/acdelco/genuine-g ... 20759.html
2 ID marks 77.2mm
https://www.carid.com/acdelco/genuine-g ... 20758.html

1 ID Mark 76.7mm
https://www.carid.com/acdelco/genuine-g ... 20757.html
NO ID mark 76.2mm
https://www.carid.com/acdelco/genuine-g ... 20756.html

[greffel]

**********************************************************************************************************************
Hello again
Did the measurement and I got 19.5mm from the edge of the wood to the marking I did with a saw blade.
This was with the piston pushed all the way in and pushing against the small flat surface

Subtracting 12mm from the 19.5mm = 7.5mm which is .74mm greater than the 6.76mm max travel spec.

Assuming all the measurements are accurate and the method is sound this measurement is saying there's too much travel for the servo and likely the 3rd gear brake band is worn. They do have different length servo pins to bring this travel within spec. What's the ID marking on the tip of your servo pin? Number of rings? A pin with no rings (ID mark) is a servo pin 76.2mm in length, four rings is a pin 78.2mm in length. There's also servo pins with 1,2 and 3 ID marks.

What I don't know is if the 0.74mm greater than spec servo travel is causing the delay in shifting or not but you could try a longer servo pin to bring back the servo travel into the correct spec range.

Looks like GM sells the servo kits and these parts look identical to the volvo servo pin but no guarantee. You would need a pin with 2 to 3 more ID rings.

GM sells servo kits for the different length pins
4ID marks 78.2mm
https://www.carid.com/acdelco/genuine-g ... 20760.html
3 ID marks 77.7mm
https://www.carid.com/acdelco/genuine-g ... 20759.html
2 ID marks 77.2mm
https://www.carid.com/acdelco/genuine-g ... 20758.html

1 ID Mark 76.7mm
https://www.carid.com/acdelco/genuine-g ... 20757.html
NO ID mark 76.2mm
https://www.carid.com/acdelco/genuine-g ... 20756.html

Hello
I think mine is ID1 ?

[greffel]

Before continuing this B4 case....

Just got code TCM-0117 "signal missing SLT..."

From a cold start I can drive for about 10min before I get "transmisson service req" in DIM
and the selected gear in DIM is not showing (P R N D) anymore.

Removed the TCM and checked for corrosion, still the same problem
Removed B4 and servo piston, still the same problem. ( did take the opportunity to measure and report back in this thread)
Checked the gearbox connections, looked normal.

Now the confusing part begins ...

With a warm car inside the garage the transmission error appars after 5 sec with the key in position II (engine not started)
Now I want to use a ohm meter to measure the SLT solenoid in the connection.
According to Vida it should be connector D and pins D3 and D4, the problem is that the colors doesn't match acording to my photos?
So a little bit of help here please, which pins are the SLT coil

when I assembled my new valve body I took this picture, showing the wires should be green/grey

according to Vida I should measure D3 / D4 but they are a different color ??

[firstv70volvo]

Before continuing this B4 case....

Just got code TCM-0117 "signal missing SLT..."

From a cold start I can drive for about 10min before I get "transmisson service req" in DIM
and the selected gear in DIM is not showing (P R N D) anymore.

Removed the TCM and checked for corrosion, still the same problem
Removed B4 and servo piston, still the same problem. ( did take the opportunity to measure and report back in this thread)
Checked the gearbox connections, looked normal.

Now the confusing part begins ...

With a warm car inside the garage the transmission error appars after 5 sec with the key in position II (engine not started)
Now I want to use a ohm meter to measure the SLT solenoid in the connection.
According to Vida it should be connector D and pins D3 and D4, the problem is that the colors doesn't match acording to my photos?
So a little bit of help here please, which pins are the SLT coil

when I assembled my new valve body I took this picture, showing the wires should be green/grey
Inkedunnamed_LI.jpg

according to Vida I should measure D3 / D4 but they are a different color ??
Inked20210601_184619_LI.jpg
Inked20210601_184643_LI.jpg

From the 2002 wiring diagram I have the SLT wire colors from the TCM to the connector are gray and violet/white as shown in your photo D3 and D4. I have a picture from my transmission showing the color of the SLT wires at the solenoid connector as gray and green and that looks like your photo also so it appears there's a color change in wiring from the connector to the solenoids. To me it looks like the violet/white wire changes to green after the connector, the valve body wiring harness side.
I've read those solenoid connectors can become damaged from prying them apart with a pick and the pick contacting the fragile sockets or pins. The linear solenoid connectors are difficult to pry apart and you have to be careful not to break off the retaining clip section of the connector. If the wire continuity checks out okay then carefully inspect the pins and sockets of the two pin solenoid connector. The linear solenoids should measure between 5 and 5.6 ohms.
Edit, I'm attaching a testing speed sensors document which has the TCM socket locations for the SLT solenoid. You can measure across these two socket locations (A52 and A70) to check the wiring, connectors and solenoid from the TCM to the solenoid. You do have to be careful with TCM sockets though, to measure you'll need to insert a very small diameter wire or pin for meter connect points but don't insert anything too large into the sockets that would damage them.

[greffel]

Measuring between D3 and D4 i have no contact, and according to Vida and my 2003 wiring and your info the SLT should be at those pins. If that's the case the connector on the SLT solenoid is loose or the cable is broken.

Maybe I'm tired but I can't understand where the color shift happens. Because from the connector in my second picture the cable runs directly in to the transmission ( valve body). Unless there is a connector in the RED circle and that's where the color shift happens ??

[firstv70volvo]

Measuring between D3 and D4 i have no contact, and according to Vida and my 2003 wiring and your info the SLT should be at those pins. If that's the case the connector on the SLT solenoid is loose or the cable is broken.

Maybe I'm tired but I can't understand where the color shift happens. Because from the connector in my second picture the cable runs directly in to the transmission ( valve body). Unless there is a connector in the RED circle and that's where the color shift happens ??

InkedInkedunnamed_LI.jpg

I'm uncertain where the color shift happens after seeing the connector end that actually goes to the transmission side wiring harness. I'll check my car today and measure to the SLT solenoid across the D3 and D4 pins.
Have you done a measurement of the individual wires, each D3 and D4 wire from the 8 pin connector to the solenoid connector? How about a measurement across the two solenoid pins, the solenoid by itself?

[greffel]

Measured between D3 and D4 now with a cold engine, and the result was 5.5 ohms

So I guess I can drive for 10 min again and then I will lose the connection to SLT.

[firstv70volvo]

Measuring between D3 and D4 i have no contact, and according to Vida and my 2003 wiring and your info the SLT should be at those pins. If that's the case the connector on the SLT solenoid is loose or the cable is broken.

Maybe I'm tired but I can't understand where the color shift happens. Because from the connector in my second picture the cable runs directly in to the transmission ( valve body). Unless there is a connector in the RED circle and that's where the color shift happens ??

InkedInkedunnamed_LI.jpg

I'm uncertain where the color shift happens after seeing the connector end that actually goes to the transmission side wiring harness. I'll check my car today and measure to the SLT solenoid across the D3 and D4 pins.
Have you done a measurement of the individual wires, each D3 and D4 wire from the 8 pin connector to the solenoid connector? How about a measurement across the two solenoid pins, the solenoid by itself?

I unplugged the D connector on my car and measured across D3 and D4 (SLT solenoid) measured 6.2 ohms, see photo. I also measured SLU and SLS solenoid resistance values through the D connector pins, measured between 6.2 and 6.4 ohms for the three linear solenoids. I didn't measure from the other half of the connector back to the TCM. From the valve body wiring harness connector side you should see ~ 6 ohms between D3 and D4 for the SLT solenoid.

I also attached a photo when I replaced the valve body in my car to show the wire color code going to the SLT solenoid. I can't explain the wire color code at the solenoid and difference at the D connector (wiring diagram colors) but from the looks of it there are also other wire color code differences in the valve body, it's almost as if the wires are spliced within the wire harness jacket somewhere. In any case you should measure a solenoid resistance value across D3 and D4.
If you're not seeing the expected resistance value you'll need to unplugged at the solenoid connector and check the individual wires and solenoid itself.
If you are seeing the expected resistance value with the D connector unplugged then you'll have to plug the D connector back together and check again at the TCM pin sockets to check the wiring between the TCM and D connector. .

[firstv70volvo]

Measured between D3 and D4 now with a cold engine, and the result was 5.5 ohms

So I guess I can drive for 10 min again and then I will lose the connection to SLT.

I just now saw this while I was posting the previous response. So you do measure for the expected SLT resistance value across D3 and D4 but when the engine is warm you see an open? If so then the the problem is between the D connector and solenoid, which narrow things down to the SLT solenoid itself and wiring/connectors. Because it's temperature dependent I would suspect the solenoid first then the wiring/connectors. Did this problem just start or have you seen it before in the past?

[greffel]

* 5,5 ohm with cold engine
* and open connection when warm

Seems to act like this, at least from these two days of testing.
Have never seen this problem before not on the old valve body or the new one.

If possible I would like to not drop the subframe again and remove the oil pan to the valve body.
We all know that the solenoids can become sticky when warm but I have never heard of a coil that break and then cool down and fixes it self.

I'm really interested where the wires change color, just to see if there is a bad contact in that spot.
Must be where I put a red circle in the photo.