need help transfer case is in neutral
#11
Thanks for your help. I think first I will "clean" the tccm.I read in another forum that there is a way to clear it by taking of the 4wd fuse. If that doesenīt work Iīll take it in 2wd mode the hard way and drive to a friends workshop to read and clear the tccm. I think thatīs the best way at the moment.
Remember that driving with the encoder motor and/or TCCM unhooked will certainly set a code and you will need to reinstall the encoder motor at your friend's shop or a code will immediately be set. If he is a good friend, push for him to bring his scanner to you!! Still at some point you will want to make sure the transfer case will physically move through the gear selections.
Let us know how things turn out. Please keep in mind that a bad encoder motor can short out and ruin the TCCM too. That is the case that I had with mine - but it was blowing the 20A ATC fuse under the hood. Most common problem with TCCMs is corrosion at the big red wire at the TCCM connector. Second most common problem is position sensor in encoder motor goes bad.
Best wishes,
Last edited by LesMyer; 04-28-2016 at 09:59 AM.
#12
next day next step...I took of the t-case motor and took it out of neutral...donīt know if 2hi or 4hi....and drove to my Buddys workshop. Took the t-case back onto neutral, put the encoder motor back onto the t-case and made a scan. He uses the Bosch interface and this one wonīt go into the tccm or elsewhere, but the next problem was shown. My speedometer is on 200km/h and stays there. Is there another encoder or something else at the plugs of the encoder motor?? I think I have to look for another interface that works with my Blazer
#13
next day next step...I took of the t-case motor and took it out of neutral...donīt know if 2hi or 4hi....and drove to my Buddys workshop. Took the t-case back onto neutral, put the encoder motor back onto the t-case and made a scan. He uses the Bosch interface and this one wonīt go into the tccm or elsewhere, but the next problem was shown. My speedometer is on 200km/h and stays there. Is there another encoder or something else at the plugs of the encoder motor?? I think I have to look for another interface that works with my Blazer
Interfaces that connect to the 4WD TCCM are very uncommon. Tech 2 is the ony one I know that connects in a nice interface without sending/receiving hexadecimal. If anyone else knows of any other options, now would be the time.......
If you want to do the hexadecimal thing to communicate with your TCCM, here is the OBD2 interface that I successfully used:
https://www.scantool.net/scan-tools/obdlink-sx/
I used Scan XL Pro software on a Windows Netbook in a "custom terminal" to accomplish the communication. Unfortunately this software is $150.
This OBDLinkSX scan tool happens to come with complimentary software called OBD2WIZ, and it also is supposed to have an OBD2 terminal built in. See KEY features here. They call it an OBD Console:
https://www.scantool.net/obdwiz/
I have never installed this software but I do have it. If you are seriously interested in buying the OBDLinkSX and using this complimentary software for hexadecimal communication with your TCCM, I will try it out to make sure it works for successful communication first. Based on my negative experience with terminals on Android phone through bluetooth device, to me there is question if you can type hexadecimal directly into the OBD2Wiz terminal the way I have done it. Let me know how you want to proceed.
Last edited by LesMyer; 04-29-2016 at 11:07 AM.
#14
Yesterday we made the next steps....Mr.Postman deliverd my OBD cable and we looked at the TCCM. It seams that everything is ok.Than we decided to take a look at the t-case motor. Took it out and checked it....it looks like that this is the problem īcause the motor is dead. Now I have to order a new one but thatīs not so easy to get a cheap one here in Germany.
#17
Today Rockauto deliverd the new Transfer case motor and the Blazer is running....but only with the original "damaged" TCCM. I think the second one that I bought is damaged and killed my old t-case motor īcause it gave no signal to the new one but clicked inside. I changed it to the old original one and it was on 4Hi. After a little bit "playing" and talking good to gm the old one went into 2Hi but with the 4wd service lamp on.After two new starts the 4wd light was off and didnīt come back until now. Iīthink Iīll buy a new TCCM with the same number like my original one and hope that my 4WD will work "normal" THX for your help Les
#18
Today Rockauto deliverd the new Transfer case motor and the Blazer is running....but only with the original "damaged" TCCM. I think the second one that I bought is damaged and killed my old t-case motor īcause it gave no signal to the new one but clicked inside. I changed it to the old original one and it was on 4Hi. After a little bit "playing" and talking good to gm the old one went into 2Hi but with the 4wd service lamp on.After two new starts the 4wd light was off and didnīt come back until now. Iīthink Iīll buy a new TCCM with the same number like my original one and hope that my 4WD will work "normal" THX for your help Les
Best regards,
Les
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