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Re: Sorry, but I have to butt-in here Posted by SWEDECAR [Email] ![]() ![]() ![]() In Reply to: Re: Sorry, but I have to butt-in here, John Daikh, Thu, 27 Oct 2005 12:17:20 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The ECU sends a steady 0.5 Voltage signal toward the O2 sensor. This signal will never swing even when engine is heated up if you have disconnected the O2 sensor wire from the engine harness.
That ECU 0.5 V is of such a weak nature that when the O2 sensor is warmed up and start doing its oscillation, the O2 sensor voltage overcomes the steady 0.5 V from ECU and the ECU start reacting to the O2 sensor voltage instead.
The 0.5 V from ECU is used during cold start to set a basic mixture.
Anders
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