l have a 2000 5.3 with stage 2 cam cold air and electric fans. i used lsdroid to read the ecm and it shows the OS 9381344 which apparently is not an easy OS to find .xdf files for.
a friend told me to write it with OS 12202088. i have the .xdf and .bin for 12202088 and changed a few things with tunepro. VAT off , rearend ratio, speed limiter.
before i overwrite the ecm has anyone else done this OS overwrite and were there any issues or complications i should know about?
Last edited by Oso; 01-27-2021 at 07:49 PM. Reason: incomplete info
Hello,
Yes, its been done many times but I have a few questions for you.
Is this your daily driver vehicle?
Do you have a spare PCM upon which to do the OS change?
Bench harness or flashing in the vehicle? Bench harness for me.
Have you made a file copy of your current OS?
Rick
1970 Chevy El Camino, LM7 Engine, 4L60E - Two 896 and two 0411 PCM's
It’s my DD but I have another. Don’t have a spare but my buddy has a wrecking yard so it’s a phone call away. In the truck flashing and I made a copy of the original just in case.
Reading your PCM with it installed in the truck is zero risk. Writing an OS to it with it installed in the vehicle carries moderate risk. This is due to other modules on the bus causing noise and chatter that can interfere with writing. A falling 12 volt battery voltage in the vehicle is always risky.
Doing this in the vehicle can turn your PCM into a wheel chock. They also make nice book ends on the shelf and can be a real conversation starter on the kitchen table . . . mostly from my wife telling me to clean that mess up.
Rick
1970 Chevy El Camino, LM7 Engine, 4L60E - Two 896 and two 0411 PCM's
If it makes it safer I can pull the ecm and make a bench harness. I have a good power supply.
How do I get it to write the new OS?
You need a device that connects to the OBD2 connector. I use a Bluetooth OBDLink MX device for hardware and either "LS Droid" or "PCM Hammer" to do the writing. Tuner Pro RT for me is only for editing the BIN. My bench harness has a three amp Radio Shack power supply for a perfect 13.8 volts delivered to the PCM.
If you have already made a copy of your OS, it sounds to me like you already have the capability to write an OS. Or did somebody do that for you?
Rick
1970 Chevy El Camino, LM7 Engine, 4L60E - Two 896 and two 0411 PCM's
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