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Discussion Starter #1
Hi everyone,

I have a '90 old 900s non-turbo, which have a high idle problem when warm.

I have checked all vacuum leaks,
changed AMM, AIC, Oxygen sensor with a new one,
checked the TPS sensor, and also the NTC sensor.

All done, but no improvement with the problem.

Now I'm checking the ECU wirings.
All wirings seems ok,
but I found that there is some
resistance(~1 ohm) between the Oxygen sensor and ECU.

Is it a normal case?

In the bentley book's wiring diagram,
there is a sort of circle in the wiring,
but I cannot know the meaning of the diagram.

Does anybody know about the meaning of this circle?
 

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1 ohm is not much. You can get that in a short length of wire or even in a connector. I would not trust any meter that gives that value. You can get that in the test leads alone. Try shorting the meter test leads and see what value is indicated. The dotted circle you refer to indicates a shielded cable.
 

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Discussion Starter #3 (Edited)
Hi peva,
yes, 1 ohm isn't a high number.
But other wires connected to the ECU get 0.1 ohm at average when tested.
Only oxygen sensor's wire get that number.

And because the oxygen sensor's voltage vary from 0.4 to 0.8 V
I thought that this amount of resistance
is high enough to affect sensor's signal.

I was wondering if it is normal to get a higher resistance with the O2 sensor's wire, compared to other wires.
 
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