Doing some tests on car to see why its running rough. Just need to know which pinout on ecu is suppose to be constant power and which is suppose to be signal. Two are 27 W 26 B just don't know which is which.

 

Is there a specific reason you're testing at the ECU? You can bend back the rubber on the MAF harness to test voltage. Also, if the ECU has issues, it will go into a distinct failsafe mode.

 

It looks like constant power comes from the ECCS relay, not the ECU. The diagram and test procedure is in the FSM: EF & EC 256.

 

ok I don't have a FSM does it show which wire is the signal? No reason testing at ECU was just trying to chase wires down. Just need to know which is the signal to the ECU and easiest to say by color or pinout. then that one wire you know the blue one....

 

Left -> Right on the MAF harness:

white to ECU, ground, blue to ECU, power from ECCS relay

Both white and blue should have continuity, beyond that I'm not sure what signals they carry.

 

ok on my SAFCII on my other car I belive I have it through the white wire just can't check right now. think I got it now