I did some poking around in a definition file for the $42 mask and what caught my eye was the "Options @ 0x0005" byte. Looking at the notes next to bit 6 I read the following: "MAT degrees for F132 table; Off=Inlet temp". This leads me to two questions... 1) What is the F132 table? And 2) Would I be naive to think that I could simply set this bit to 1 and install a MAT sensor (and, of course, change the lookup table to appropriate values for MAT temps instead of CTS temps)?
Option two sounds way too easy to be true so I did some more comparing. Looking at the pin-outs for the 7747 and 8746, I see that they are basically identical. The only exceptions are:
- Canister purge solenoid control @ A3
- VATS @ B6
- A.I.R. Converter solenoid @ C1
- MAT sensor @ C12
- A second "Injector 2" @ C15
- A second "Injector 1" @ D15
Does anyone know if the hardware portion of the ECM is the same and they just run different code?
Can you run a 8746 .bin in a 7747?
Is the difference in the code between these two ECMs located in the PROM, in the ROM or in both?
Thanks for any insight......