I recently purchased a PSI3 unit to replace a faulty one that I have had from New. When this newer unit arrived with instructions, I realised that the wiring appeared to be different than what was in the car. Having researched a little further, there appear to be two wiring diagrams for these units. (Probably different units....)

I'm sure that someone will clarify, but this is how I determined what was what.....

The first image shows the instructions for wiring, but this was wrong. The way to check is to see if sensor ground to sensor +5v gives an actual 5v reading, this will point out which terminals on the unit are which according to the below documents.
The second image shows the correct wiring for both of my units.
The last image is of my units.

To add insult to injury, the replacement unit that I bought came from a really helpful Scooby fan and he has given me details of a bloke who repairs the PSI3 units! So I will shortly have two! (I hope). P.m. me for his details if required.

I hope this helps someone, any comments welcome.







https://www.dropbox.com/s/qrfdikdfwl...50.42.jpg?dl=0