Copy PCM to swap in a new one with Tech 2?
- Thread starter Matthew Jeschke
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Matthew Jeschke
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Yes positive it's in the cluster. I can power up just the cluster and it shows the mileage.
Is there a tutorial or something on PCM hammer for programming clusters?
Found the code https://github.com/mikebb203/IPC-Hammer
Is there a tutorial or something on PCM hammer for programming clusters?
Found the code https://github.com/mikebb203/IPC-Hammer
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Matthew Jeschke
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I tore apart my cluster again... Bench tested it with a 10vpp square wave going to the speedometer pin A7.
Removed all modules not related to the gauge to see if one was interfering.
I also gently pressed on the board in various spots to see if possibly a trace or via broke or delaminated.
Additionally, I probed the square wave to see if something was corrupting the input. It's clean at least at the header.
Still have same issue, speedometer will not respond.
I see there's a serial data pin on the cluster. I tried wiring that directly up to the VX nano adapter.
I wondered if I could do anything with Tech 2 or PCM hammer to scan the cluster, maybe the software on it just got corrupted? Or if I have to have the cluster installed in the vehchile w/ PCM and other computers to communicate with the cluster?
Removed all modules not related to the gauge to see if one was interfering.
I also gently pressed on the board in various spots to see if possibly a trace or via broke or delaminated.
Additionally, I probed the square wave to see if something was corrupting the input. It's clean at least at the header.
Still have same issue, speedometer will not respond.
I see there's a serial data pin on the cluster. I tried wiring that directly up to the VX nano adapter.
I wondered if I could do anything with Tech 2 or PCM hammer to scan the cluster, maybe the software on it just got corrupted? Or if I have to have the cluster installed in the vehchile w/ PCM and other computers to communicate with the cluster?
mattbta
Full Access Member
I was looking for a radio bench harness and stumbled across this and filed it away for later. Not sure if it applies to a 99 though.
gmtnation.com
SOLVED! - How to Make A "GYMKO" Tech 2 Bench-Top Test Harness
I'm sorry if this Topic has been neglected by me since March 20th, 2018... but there always seem to be other more pressing projects and repairs that must supersede a project like this that, while interesting for the sake of exploring these ideas and possibilities... are not absolutely necessary...
gmtnation.com
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Matthew Jeschke
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@mattbta thanks! I'll go through it 
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Matthew Jeschke
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Welp I was able to wire up the VCX Nano to the instrument cluster. I think it is working, but the PCM Hammer for IPC isn't compatible with whatever is on this cluster form the looks of it. Unless I did something wrong. I simply did Pin 2 OBD2 connector to Pin A11 on the cluster for serial data. Then of course powered everything up. For sake of completeness I have the PCM also hooked up.
I'm now trying to use this Tech2Win to see what I can do with it for self checks. Confused though...
What do I select here? Seems to make no difference either way...
This screen is just blank... I cannot get it to populate with anything.
If I click cancel it will bring up Tech2Win but only allows year 2003 or 2002 for Chevrolete? My corvette is a 1999
I'm now trying to use this Tech2Win to see what I can do with it for self checks. Confused though...
What do I select here? Seems to make no difference either way...
This screen is just blank... I cannot get it to populate with anything.
If I click cancel it will bring up Tech2Win but only allows year 2003 or 2002 for Chevrolete? My corvette is a 1999
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