“Am I reading the above correctly that you can’t just swap out the ECU if you think it might be defective and that something else needs to changed at the same time?
If something else has to be changed at the same time can someone indicate what that might be and why please?”

I’m going off my 1996 Rover 100 fitted with the MEMS 1.6, and I’m presuming your versions of MEMS will be the same.

With my car, fitted with the Lucas 5AS immobiliser, if you fit a different ECU, the car will run for 2 seconds and then cut out.   So you have to use the PSCAN to program the ECU to the alarm.    I believe I have that correct: the temptation is to think you are programming the alarm and fobs to the ECU, but I believe that is not the case - the ECU is matched to the alarm.   (I’m sure Mr PSCAN can correct me if that’s wrong.).   None of the free diagnostic software packages I’ve mentioned, MEMS Diag, MEMSFCR…., can do this.

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