Does anyone know what the voltages should be reading on the o2 sensor(same sensor for SR and RB20) and what wires are what? I have a red-white-black on the sensor. One of our SR swap customers was having a hard time starting his swap and wired a 12v+ to one of the 02 wires and it fixed it. My swap is running rich and the sensor is only showing .62 volts on 2 of the wires and nothing on one of them.

 

pin 1 is heater/power
pin 2 leads to the ECU(pin 29) for signal
pin 3 leads to the ECU(pin 115) for O2 heater ground

Voltage should be between +0.6v and +1.0V on pin 2(pin 29 on ECU) and +12V on pin 1

The O2 heater will only run when the engine is first started.

 

Ok I have a problem then because I don't have the +12v heater when the engine is cold. That's why it starts like crap i think. Any colors to go along with the pin #'s(1-2-3)?

Thanks for the help

 

signal is clear insulation
heater ground is tan
not sure on the +12V one....

 

I have 2 tans and a clear, going to a red-white-black on the o2. I'm going to trace which brown is the pin 115(heater ground) to the ECU and try hooking up a 12v+ to the other tan and see if it helps.

 

ok now more confusion-I tested pin 115 for heater ground to find which tan wire was ground and they BOTH are grounded to pin 115? How does that work?????Everybodys RB swaps are startng grumpy we're all missing something here......

 

rewire it all....just redo the )2 wiring altogether....Not sure where your problem is, but if you do this....it's bound to fix the problem.

 

someone let me know how this turns out, cause I am in the same boat

 

rk, if you rewire the 02 get some pics please and let me know how you did it. reran the wires, just redid the ends at the ECU or what, I need to get this thing inspected and I would rather not take it in if it doesnt feel like starting right away