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Re: AF30 Halmeter and Oxygen sensor.Thanks Brian and others! 700 1988

posted by  someone claiming to be Gene Stevens on  Sun Nov 26 07:41 CST 2000 [RELATED]

I reread the original post, and there's a sentence after describing the wire repair, that included that phrase "the Halmeter is properly connected" followed by "I read about 0,82volt on the digital meter(on idle)". I may have misunderstood that to mean that the poster got that reading at the firewall connector, after the wire repair, with the sensor attched to the harness. It may have simply been with the wire hanging free.

I believe the LH is not a biased sensor, meaning there should be no voltage on the ECU side without any sensor output. The .5 volts is just the median voltage found during normal closed loop operation.

So, Mikael - what is the voltage reading you have on the digital meter with all wires connected as Volvo put them, Halmeter not connected, using the engine (not body) for the ground point? Assuming it is low, can you get the voltage reading to rise during race-up or by removing the vacuum hose from the fuel pressre regulator? Does the sensor output reading increase to normal when it is separated from the harness connector?





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