The only difference (aside from the vehicle wiring harness pin population) was the PROM. This ECM was used on the 1989 S-10 truck with the 2.5L four cylinder, the ’89 Camaro with the 5.0L HO V8 and the ’89 Corvette with the 5.7L Tuned-Port V8 engine.

For example, in 1989, Chevrolet used one engine control module, P/N 1227165, to control three different engines.

The PROM chip is used to calibrate the ECM so that it is configured to run a particular engine.

Naturally, this short list does not describe the entire contents of the ECM, but what is important to our understanding of flashing is the PROM part of the ECM. They have a microprocessor, built-in random access memory (RAM), signal-conditioning chips (for sensor inputs), output transistor/drivers (for actuating ignition coils and fuel injectors) and a programmable read-only memory-type chip (PROM) for calibration purposes. Going back to the basics, you know that all automotive engine and powertrain control modules (PCMs) are essentially small-sized, dedicated computers. Before we get into what it takes to flash ECMs, let’s take a closer look at what flashing really is, why it is utilized on virtually all late-model cars and why this is such a great opportunity for repair shops. In case you’re on the technological slow boat, “flashing” refers to reprogramming automotive engine control modules (ECMs). Verified correct PCM part number with dealer/VIN.I think we can all agree that the first group is far better off, and the only thing we need to expose is the benefits of this new “flashing” technology. I swapped the PCM power relay with no change, i have load tested all VPWR power and PWRGND grounds with a bulb. I have confirmed that when the truck goes dead i am loosing voltage at VPWR circuits. I tried blank tear tag method too but no luck. There are a few tick marks to check past then the tool requests 'Key on' I key on everything is normal until i click to confirm and then the entire vehicle goes dead/ powers off… If i disconnect from the OBD port the truck will come back alive by its self and power up after a few seconds? I have experienced this issue both with PMI and Module Reprogram options. I am using FJDS - The old one still communicates so i started with it plugged in to inhale the original data and then installed new module when instructed. Hello Group - I was hired to program a newly installed OEM PCM for this F-150.

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