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2.8V doesn't sound right? I wonder if you might have a
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Posted by SWEDECAR [Email] (#112) [Profile/Gallery] (more from SWEDECAR) on Mon, 30 Jun 2003 11:05:10 Share Post by Email
In Reply to: Re: O2 sensor testing, 89 SPG, Mon, 30 Jun 2003 10:17:48
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power supply or ground problem to the ECU?

When O2 sensor is disconnected from wire harness, the ECU should send out a very weak 0.5V signal through the 1 blade connector with the white housing.
That .5V reference signal is so weak that when O2 sensor gets heated up and starts sending its own pulsing signal, the O2 sensor signal overcomes the 0.5V one and engine goes into closed loop.

If you have a too strong signal coming from ECU it might be something wrong in the power supply or ground circuit, or something wrong internally in ECU.

Injector voltage seems to be fairly correct, but that way of measuring injectors is of the old school and is not accurate enough to pin point small problems.

The 0.04V O2 signal sounds a lot more correct than the 0.4 stated earlier. Do you notice the pattern here where a slight misinterpretation can create new questions and maybe get you searching in the wrong direction?

That's how finnicky the injection system are nowadays.

You said the AMM you tried was "supposedly good". That's not "good" enough. You need to get a Bosch rebuilt or brand new one to test with before ruling out the AMM.
But you also need to make SURE all the basic settings are correct like, TPS and throttle plate.

Sorry if I can't supply you with the one and only solution answer.

Anders

posted by 67.113.86...

SWEDECAR

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