More Power
06-16-2004, 11:44
I visited the local GM dealer yesterday to have the various modules and computers re-programmed for the current truck configuration. I learned a few things while there that I thought I'd pass on.
The 2001 ECM (Engine Control Module) was overwritten with the same VIN number as that found on my 2001 GMC, as well as the most recent programming offered by GM. One of the updates included code for busy shifting when the cruise control is engaged, reduced idle surge and new code that helps the engine meet emissions certification. The engine appears to run a little smoother with the new code.
The BCM (body control module) was re-flashed with code and updates matching the new VIN, but unfortunately, that did not correct the Service 4WD message. As it turns out, the BCM doesn't have anything to do with the operation of the transfer case.
The TCCM (Transfer Case Control Module) I have installed is not the NP1 version I need for the NVG-263 pushbutton selectable transfer case. The technician determined through interpreting the related troublecodes that I currently have an NP8 module, which was designed for an automatic 4WD system (light-duty all-wheel-drive systems). So, I had them order the correct module. Once that has been installed, all necessary systems should function without setting any related codes. The TCCM is not programmable for different applications.
The programming that came in the 2002 TCM (Transmission Control Module) was left intact. I'm currently using a 2001 ECM and a 2002 TCM. John Kennedy informed me that this combination shouldn't be a problem, and it allows me to upgrade to a 2002 ECM at a later date if the aftermarket programmers aren't able to alter the vehicle speed limiter and engine governor setting in the 2001 module - both of which will need to be altered at some point during the final phase of the performance testing.
I also discovered that my "key in ignition" switch wasn't functioning as expected - though I had not seen any indication of that. I also asked the tech to test the operation of the APP (Accelerator Pedal), looking for the correct range of 0-100% on all three elements of the module. This APP module is one produced for an electronic 6.5, but with the 2001 wiring re-configured to match the 6.5 APP input/outputs. We found that the APP module performs exactly like those made for a Duramax application. I thought it would, but I wanted to also make sure I was getting a full 100% with full pedal.
I had planned to have the dealership update the odometer and hour meter to reflect actual mileage and time for this powertrain. But, the instrument panel cluster can't be altered using a Tech II scan tool. You must remove it from the vehicle and input new numbers using GM's Techline Terminal. So, I thought I'd leave it alone for the time being. The instrument panel had 1930 miles and 67 hours on it when I first powered it up. No big….
MP
The 2001 ECM (Engine Control Module) was overwritten with the same VIN number as that found on my 2001 GMC, as well as the most recent programming offered by GM. One of the updates included code for busy shifting when the cruise control is engaged, reduced idle surge and new code that helps the engine meet emissions certification. The engine appears to run a little smoother with the new code.
The BCM (body control module) was re-flashed with code and updates matching the new VIN, but unfortunately, that did not correct the Service 4WD message. As it turns out, the BCM doesn't have anything to do with the operation of the transfer case.
The TCCM (Transfer Case Control Module) I have installed is not the NP1 version I need for the NVG-263 pushbutton selectable transfer case. The technician determined through interpreting the related troublecodes that I currently have an NP8 module, which was designed for an automatic 4WD system (light-duty all-wheel-drive systems). So, I had them order the correct module. Once that has been installed, all necessary systems should function without setting any related codes. The TCCM is not programmable for different applications.
The programming that came in the 2002 TCM (Transmission Control Module) was left intact. I'm currently using a 2001 ECM and a 2002 TCM. John Kennedy informed me that this combination shouldn't be a problem, and it allows me to upgrade to a 2002 ECM at a later date if the aftermarket programmers aren't able to alter the vehicle speed limiter and engine governor setting in the 2001 module - both of which will need to be altered at some point during the final phase of the performance testing.
I also discovered that my "key in ignition" switch wasn't functioning as expected - though I had not seen any indication of that. I also asked the tech to test the operation of the APP (Accelerator Pedal), looking for the correct range of 0-100% on all three elements of the module. This APP module is one produced for an electronic 6.5, but with the 2001 wiring re-configured to match the 6.5 APP input/outputs. We found that the APP module performs exactly like those made for a Duramax application. I thought it would, but I wanted to also make sure I was getting a full 100% with full pedal.
I had planned to have the dealership update the odometer and hour meter to reflect actual mileage and time for this powertrain. But, the instrument panel cluster can't be altered using a Tech II scan tool. You must remove it from the vehicle and input new numbers using GM's Techline Terminal. So, I thought I'd leave it alone for the time being. The instrument panel had 1930 miles and 67 hours on it when I first powered it up. No big….
MP