Why? You need it. I double checked the diagram and they are a few minor changes. It should be able to work. I need to double check the rom. Dont go all over the place. One step at a time.
2001 PCM/ROM dont have the following pin/sensor from the 02 PCM/ROM
pin 51 fuel temperature sensor
pin 60 Fuel level sensor
02 PCM/ROM dont have the following pin/sensor from the 01 PCM/ROM
pin 43 Spark plug check signal
pin 80 vehicle speed sensor - thats why our 02-03 speedo don't work when you go 5 speed and the 99-01 works because of this.
So you putting a 2001 PCM on your 02 car so you wont have
pin 51 fuel temperature sensor
pin 60 Fuel level sensor
You wont get any CEL since the 01 rom dont have such pin enable
If you put a 02-03 PCM on a 01 Galant you will get
CEL:
pin 51 fuel temperature sensor
pin 60 Fuel level sensor
You will get CEL since the PCM is looking for these sensor that the 01 dont have.
Let me know when you get your cable so i could review the ROM.
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