- Joined
- Dec 22, 2017
- Messages
- 73
- Reaction score
- 15
- Location
- San Diego, USA
- VCDS Serial number
- C?ID=345556
1993 Eurovan Auto Transmission - 098
TCM part number - 098927731 B (photos of my TCM)
Main question - if an Auto-Scan for Chassis type 70 - VW Transporter/Multivan 91-96 (01 Digifant, 02 Auto Trans, 03, 08, 15, 22, 25) only detects the 01-Digifant (no other items detected, especially the 02-Auto Trans), would that typically indicate that the TCM or wiring to the TCM is bad? If it can be something else, what are the other possibilities?
Background
On a road trip about 8 years ago, I made the mistake of taking 395 in California/Nevada with my Eurovan loaded heavy. It had a difficult time with the passes. I also had a coolant leak that got worse on the trip, and the transmission got hot enough to melt the Auto Transmission connection wire because it had rested on a part of the trans block.
The Eurovan went into Limp Mode (stuck in 3rd gear). I made it to Reno, and I went to a local shop that said they'd take a look. They initially couldn't diagnose until finally they discovered the wire melted mess. After exhausting all attempts to find a wire harness, I asked if they could install a set of replacement wires to remove the bad 6" section. It was/is only 10 wires, and the tech successfully repaired it. At first, it didn't seem like it took. But I found that there is an Auto Transmission reset procedure on the 1993 Eurovan, and to my surprise it worked.
I drove with that repair for nearly 8 years. The wire is a part of a large harness that would be expensive and difficult to replace. Finally, the repair fatigued and corroded. My transmission went weird and I limped (3rd gear) into Transmission Repair shop, and they performed a basic service (fluid, filter). They didn't see anything to indicate damage to the mechanical (shavings were normal).
I thought maybe I should just find a perfect match portion of wire/connection. I was advised that a 90's Jetta would be a perfect match. So I redid the repair simply matching colors. Once again, something was off. I pinned out again, and it was a match with the 2001. Hmm. Maybe my 1993 Eurovan wire/connector pin out from the hacked repair wire/connector was wrong. I checked and double checked using a voltmeter. There was still a difference from the Jetta and the 2001 Eurovan.
I could really use an diagram expert with a Bentley to tell me the 1993 Eurovan wire/connector pinouts. Anybody?
Anyway, I realized that I had been very careless when performing this wire reconnection work. I had left the battery connected, and it is very likely that some wires might have touched and possible shorted.
With this said, I'm very new to TCM/ECM stuff. I would assume that this could damage the TCM. Am I correct that this is a possibility?
I ask, because I have previous VCDS scans from my Eurovan where the 098 Auto Transmission - 02 module is detected.
But now, it doesn't find it. Nothing for 02-Auto Trans.
It really makes me wonder that my TCM is shot. They aren't very easy to come by (I've seen them advertised for as high as $1000+). I did see that the same part number (but without a B designation) is available from a Passat B3 for a reasonable cost (about $100). I've also seen other TCMs advertised with other letter designations. Yet, I'm curious if that is a simple revision, or an actual design variation.
I'm in the process of examining my TCM again (located near passenger footwell).
Any Eurovan Auto Trans TCM/wire/connector 098 experts on here? And know of any compatible other VW models with compatible TCM 098927731?
TCM part number - 098927731 B (photos of my TCM)
Main question - if an Auto-Scan for Chassis type 70 - VW Transporter/Multivan 91-96 (01 Digifant, 02 Auto Trans, 03, 08, 15, 22, 25) only detects the 01-Digifant (no other items detected, especially the 02-Auto Trans), would that typically indicate that the TCM or wiring to the TCM is bad? If it can be something else, what are the other possibilities?
Background
On a road trip about 8 years ago, I made the mistake of taking 395 in California/Nevada with my Eurovan loaded heavy. It had a difficult time with the passes. I also had a coolant leak that got worse on the trip, and the transmission got hot enough to melt the Auto Transmission connection wire because it had rested on a part of the trans block.
The Eurovan went into Limp Mode (stuck in 3rd gear). I made it to Reno, and I went to a local shop that said they'd take a look. They initially couldn't diagnose until finally they discovered the wire melted mess. After exhausting all attempts to find a wire harness, I asked if they could install a set of replacement wires to remove the bad 6" section. It was/is only 10 wires, and the tech successfully repaired it. At first, it didn't seem like it took. But I found that there is an Auto Transmission reset procedure on the 1993 Eurovan, and to my surprise it worked.
I drove with that repair for nearly 8 years. The wire is a part of a large harness that would be expensive and difficult to replace. Finally, the repair fatigued and corroded. My transmission went weird and I limped (3rd gear) into Transmission Repair shop, and they performed a basic service (fluid, filter). They didn't see anything to indicate damage to the mechanical (shavings were normal).
I thought maybe I should just find a perfect match portion of wire/connection. I was advised that a 90's Jetta would be a perfect match. So I redid the repair simply matching colors. Once again, something was off. I pinned out again, and it was a match with the 2001. Hmm. Maybe my 1993 Eurovan wire/connector pin out from the hacked repair wire/connector was wrong. I checked and double checked using a voltmeter. There was still a difference from the Jetta and the 2001 Eurovan.
I could really use an diagram expert with a Bentley to tell me the 1993 Eurovan wire/connector pinouts. Anybody?
Anyway, I realized that I had been very careless when performing this wire reconnection work. I had left the battery connected, and it is very likely that some wires might have touched and possible shorted.
With this said, I'm very new to TCM/ECM stuff. I would assume that this could damage the TCM. Am I correct that this is a possibility?
I ask, because I have previous VCDS scans from my Eurovan where the 098 Auto Transmission - 02 module is detected.
But now, it doesn't find it. Nothing for 02-Auto Trans.
It really makes me wonder that my TCM is shot. They aren't very easy to come by (I've seen them advertised for as high as $1000+). I did see that the same part number (but without a B designation) is available from a Passat B3 for a reasonable cost (about $100). I've also seen other TCMs advertised with other letter designations. Yet, I'm curious if that is a simple revision, or an actual design variation.
I'm in the process of examining my TCM again (located near passenger footwell).
Any Eurovan Auto Trans TCM/wire/connector 098 experts on here? And know of any compatible other VW models with compatible TCM 098927731?
