LT1 ECM Programming Problems
LT1 ECM Programming Problems Has anyone experienced issues with corrupt data taking out an OBD1 ECM? We managed to corrupt two ECM's after each successfully took 5 to 6 updates before crapping out. The battery had plenty of charge, no disruptions made during the flash, and TunerCATS showed a successful data flash in all cases. Was surprised to find that I was left a car that wouldn't start & fans that kick on immediately after you turn the ignition on. No rhyme or reason that we could find causing the issue. Has anyone experienced this in the past, or have any idea's where to look?? Is it possible to program the chip external from the ECM?? I had a TPI car, that I could flash the chip separate from the ECM...not sure if there is away to do that for an OBD1 computer from a 94 to 97 LT1 car. Can a corrupt ECM be salvaged?? Replacing ECM's is getting expensive. Nothing like getting 
twice on the dyno today..... Any help you can pass along would be appreciated. Thanks!!!
twice on the dyno today..... Any help you can pass along would be appreciated. Thanks!!! Has anyone experienced issues with corrupt data taking out an OBD1 ECM? We managed to corrupt two ECM's after each successfully took 5 to 6 updates before crapping out. The battery had plenty of charge, no disruptions made during the flash, and TunerCATS showed a successful data flash in all cases. Was surprised to find that I was left a car that wouldn't start & fans that kick on immediately after you turn the ignition on. No rhyme or reason that we could find causing the issue. Has anyone experienced this in the past, or have any idea's where to look?? Is it possible to program the chip external from the ECM?? I had a TPI car, that I could flash the chip separate from the ECM...not sure if there is away to do that for an OBD1 computer from a 94 to 97 LT1 car. Can a corrupt ECM be salvaged?? Replacing ECM's is getting expensive. Nothing like getting twice on the dyno today..... Any help you can pass along would be appreciated. Thanks!!!
twice on the dyno today..... Any help you can pass along would be appreciated. Thanks!!! My .bin files are created by a friend who dyno tunes professionally. I completely trust those. I started tearing into the factory wire harness yesterday, focusing on ground feeds to the PCM. Is there a recovery file or a way to salvage a PCM? Is there a way to program the EEProm out of the car like in the older gen's?
My .bin files are created by a friend who dyno tunes professionally. I completely trust those. I started tearing into the factory wire harness yesterday, focusing on ground feeds to the PCM. Is there a recovery file or a way to salvage a PCM? Is there a way to program the EEProm out of the car like in the older gen's?
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Verdad Gallardo True - however unless the root cause of the "corruption" is found - corrupted .bins, grounding issues, etc... then I would not spend one dime getting a PCM resocketed as it will likely just happen again.
TECH Enthusiast
Joined: Mar 2009
Posts: 680
Likes: 8
From: Clearwater
you might need the "b" version of the $EE definition file? i only noticed 2 parts on the contstant table swapped around which was the giveaway for which version was needed. could be way off base but maybe that has been causing the problem.
i just recently made my own harness to run out of the car but for now it still requires me to connect it directly to the battery because i do not have a power supply yet to support it. if you are gettin less than 12.5v on all power connections to the PCM then you might be experiencing the intermittent tuning issues i have been having.
i just recently made my own harness to run out of the car but for now it still requires me to connect it directly to the battery because i do not have a power supply yet to support it. if you are gettin less than 12.5v on all power connections to the PCM then you might be experiencing the intermittent tuning issues i have been having.
TunerCATS said they could salvage a smoked PCM for $25.00 - thought that seemed like a decent deal. My OBD1 PCM has 4 plugs with a total of 64 pins populated & the PCM wiring diagram I have shows 6 of those to be grounding pins. I assume those 6 pins should read 0 ohm resistance in a continuity test when grounded to the chassis correct? Thanks to everyone who has posted here! This is such a great site!!!
Launching!
Joined: Jul 2003
Posts: 258
Likes: 0
From: Rancho Cucamonga, CA
Resurrecting this question since I'll be diagnosing my PCM soon. :/
TunerCATS said they could salvage a smoked PCM for $25.00 - thought that seemed like a decent deal. My OBD1 PCM has 4 plugs with a total of 64 pins populated & the PCM wiring diagram I have shows 6 of those to be grounding pins. I assume those 6 pins should read 0 ohm resistance in a continuity test when grounded to the chassis correct? Thanks to everyone who has posted here! This is such a great site!!!
