Hi guys 2005 c6 .
Faulty tcm replaced with brand new one.
Downloaded software to programme it from gm website to tech 2
Recognised vin number etc fine si download was successful.
Tried to upload / programme new tcm with software but tech 2 wont communicate with the virgin tcm
Any ideas guys
Kind regards Steve

 

Sounds like a can bus/wire problem, and the old TCM may have been fine.
Can you communicate with the TCM now, but it will not reflash,?


If you can not communicate with the TCM now,

Run a continuity test up from the TCM can bus pins on the connector to as far up line as you can to check for continuity on the can bus wire for the TCM.

PDF in the post for the lan system wires
https://www.corvetteforum.com/forums...-0n-06-c6.html

Hence the fender area begin the wheel well can get water flooded, and although the connectors do have a water seal to the ECM/TCM sockets, the back of the connector wires are pretty much wide open to get water flooded instead (lead wires to the connectors pins get corroded and the wires are not longer making contact to the connector pins, hence may need to check the entire TCM connector pins to all the wires to make sure that there is not a short in one of them and the TCM may not even be getting power).

As for reprogramming it you can comnicate with the TCM on the lan, it straight forward,

Doc#1466621
Service Programming System (SPS)
For step-by-step programming instructions, please refer to the techline information system (TIS) terminal.

Review the information below to ensure proper programming protocol.

Important:

• DO NOT program a control module unless you are directed by a service procedure or you are directed by a General Motors Corporation service bulletin. Programming a control module at any other time will not permanently correct a customers concern.

• It is essential that the Tech 2, MDI and the TIS terminal are all equipped with the latest software before performing service programming.

• Due to the time requirements of programming a controller, it is recommended that an external power source be used to maintain system voltage. Stable battery voltage is critical during programming. Any fluctuation, spiking, over voltage or loss of voltage will interrupt programming. To ensure trouble-free programming, GM recommends using one of the following external power sources:

- A Midtronics PSC charger

- A fully charged 12V jumper or booster pack disconnected from the AC voltage supply

• Some modules will require additional programming/setup events performed before or after programming.


TCM Reprogramming Procedure
If the TCM is reprogrammed, the following procedures must be performed:

Refer to Service Programming System (SPS) (listed above) .

Ensure the following conditions exist in order to prepare for TCM programming or reprogramming:

• The battery is fully charged.

• The ignition switch is in the RUN position.

• The Techline equipment cable connection at the data link connector (DLC) is secure.

Program the TCM using the latest software matching the vehicle. Refer to up-to-date Techline equipment user instructions.

If the TCM fails to program, proceed as follows:

• Ensure the TCM connection is good.

• Inspect the Techline equipment for the latest software version.

• Attempt to program the TCM. If the TCM still cannot be programmed properly, replace the TCM.


• Some vehicles may require the use of a CANDi or MDI module for programming.

• Review the appropriate service information for these procedures.

• DTCs may set during programming. Clear DTCs after programming is complete.

• Clearing powertrain DTCs will set the Inspection/Maintenance (I/M) system status indicators to NO.


Ensure the following conditions are met before programming a control module:

• Vehicle system voltage:

- There is not a charging system concern. All charging system concerns must be repaired before programming a control module.

- Battery voltage is greater than 12 volts but less than 16 volts. The battery must be fully charged before programming the control module.

- Turn OFF or disable any system that may put a load on the vehicles battery, such as the following components:

• Twilight sentinel

• Interior lights

• Daytime running lights (DRL)--Applying the parking brake, on most vehicles, disables the DRL system

• Heating, ventilation, and air conditioning (HVAC) systems

• Engine cooling fans, radio, etc.

• The ignition switch must be in the proper position. SPS prompts you to turn ON the ignition, with the engine OFF. DO NOT change the position of the ignition switch during the programming procedure, unless instructed to do so.

• Make certain all tool connections are secure, including the following components and circuits:

- Tech 2

• The RS-232 communication cable port

• The connection at the data link connector (DLC)

• The voltage supply circuits

- MDI

• The USB, Ethernet or Wireless communication port

• The connection at the data link connector (DLC)

• DO NOT disturb the tool harnesses while programming. If an interruption occurs during the programming procedure, programming failure or control module damage may occur.

• DO NOT turn OFF the ignition if the programming procedure is interrupted or unsuccessful. Ensure that all control module and DLC connections are secure and the TIS terminal operating software is up to date. Attempt to reprogram the control module. If the control module cannot be programmed, replace the control module.


P.S. The Vin check came from the ECM to be able to download the firmware for the re-flash, so again, make sure that you are able to communicate with the TCM on the lan first. If can not, then you have a wiring problem to the TCM that needs to be solved first.