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With the -ve on ground and the +ve on Ox I should be seeing between 0.1v to 0.9v with quite a lot of fluctuating but I'm getting nothing! Also, when I try to test fuel trim I should be seeing 2.5v ish but again I'm not getting a reading. This is with the car fully warmed up. I saw the right readings once last week but have not been able to replicate this. Any suggestions? I'm thinking lamda is gone? The contact I am making is good. Its puzzling that I got it to do it once before but not again. I went and had a probe put in at my local mot place and he said it was a little rich if anything until he touched the throttle and then the 02 volume reading went too high.sorry I can't remember the exact figures now. Which colour wire is signal on the lambda sensor as I can check it tomorrow. I also have a defi display with AFR on it which is giving odd readings. This is connected directly to the ox port and is set for narrowband. On throttle it reads 20!!!!!!! When coasting or off throttle it comes down to about 15 or 16 but no lower! Theres a lot of talk about doing the Toyota test procedure but no on seems to actually get the fluctuations. I'm beginning to think theres a misprint or type error in the procedure as I tried it and it didn't work either.thomp1983 wrote:Are you using a digital multimeter? It's difficult to see the fluctuations on a digital meter holding the revs higher should help, it's also difficult to get a decent contact on the pins in the diag port.
- if your multimeters refresh rate is slower than that, get a better multimeter. If you're struggling to get a connection, insert a small length of wire as the wire will be able to get further into the terminal than some of the fatter multimeter probes.Mr2Owner wrote:Does that analogue needle fluctuation test actually work, I've yet to see a single person on these forums get it to work first hand.
I've tested o2 sensors via the diag port on several MR2's.