Who's Measured Their O2 Sensor Output?

[Spammeoff]

Hi Guys,

Last night I was installing an AFR meter, and using the pinout I found here(http://www.skylinesaustralia.com/forums/index.php?act=Attach&type=post&id=31087),

I attacked the ecu wiring for some splicing fun.

Looking at the Pinout Chart, I took number 50 to be the O2 sensor reading ("Heated oxygen sensor signal"). So put the multimeter between that wire and chassis ground and started the car. Voltage started at 2.2v, and slowly decreased to about 1.4v once eng.temp was completely warm. I hooked up my gauge, but I knew it probably wouldn't register anyone above 10:1, as its made to measure between 0 and 1v. Went for a drive, but volts never dropped below 1v.

So I cut the wire to the ecu (leaving the gauge still attached to it), and volts dropped instantly to 0, and sat there. Engine check-light came on, which I expected, and then after a little while car wouldn't even start (dunno why!). Reconnecting oxy sensor wire to ecu and reseting ecu fixed all that.

So I figure my oxy sensor is probably stuffed, no worries. But why I saw 2.2V which dropped to 1.4V is still a mystery. Anyone else measured theirs?? Also, the wire for lights wasn't present on my ecu! jeez.

Oh and the oxy wire at the ecu is purple if anyone is trying to find it. Once I've got this gauge running successfully I'll do a tutorial, its a big of a pain digging out the wires from the pinout diagram.

Edited May 17, 2006 by Spammeoff

[ian]

According to the manual, it should be flipping from somewhere between .1v-.4v to .7v-.9v. At 2000 rpm it should be doing the flips (ie an up and down cycle) about 3 to 4 times a second.

Ian