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Discussion Starter · #1 ·
I have a 4 wire toyooto O2 sim, anyone have a diagram
 

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Discussion Starter · #3 ·
There is a brown blue black and white wire. I know where to connect on the ECU i dont remember what the different colors are for.
 

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blue is the signal wire. not sure i remember the rest. i can tell you when i get home.
 

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Discussion Starter · #5 ·
thanks. looks like brown is ground, black is power. white might be a signal but i can see I spliced them to blue before.
 

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Discussion Starter · #7 ·
Ah ok, hmm I wired at the ECU but that answers my question thanks.
 

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white = front sensor signal
blue = back sensor signal
black = heater wire
brown = heater wire
 
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