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It isn't that easy anymore, so be careful with what you
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Posted by Anders (more from Anders) on Tue, 14 Jan 2003 20:07:26 Share Post by Email
In Reply to: wire diagram for a 4-wire O2 sensor, August, Tue, 14 Jan 2003 18:48:09
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are planning to do.

One of the white wires are full battery power, the other white wire is ground supplied from ECU. This ground signal have different strenght depending on temperature of engine.

The black wire is one signal wire and the grey wire is another signal wire.

These two wires sends two different voltage signals to ECU (kind of a low and high one).

Black wire is 0.5V to 1.5V
Grey wire is 0.25V to 0.75V

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