I have a Dawes AFR with +12v, GND and o2 signal wires I want to connect to the ECU. I have two copies of the ECU pinouts, one given to me by someone on here and another for the P1 I found myself.
I intend to take the +12v from B136 pin 25 which is live when the ignition is on.
The o2 signal is shown as B136 pin 21. However on both printouts B136 pin 21 is also given as GND (control systems) along with B136 pin 18. Anyone know what that is all about?
For the GND I would use either the main ECU power GND on B134 pin 8 or the GND (sensors) given as B136 pin 24. Any preferences?
Kevin

 

Ground is any ground point,earth for another term..... make it a good one though as ive heard some afr guages are very sensative to earth points and can affect the way they work..... from memory my pick up wire was a white with silver dashes at the ecu.....earth i took to the loom earth underneath the steering column,live off any of the dash wires that are live when ignition on.