Hi ,

I have tryed to measure the o2 value , like described in the article on this page but I always get values between 1.64 Volts idle and 1.92 Volts full throttle but there is writen vlue must be under 1 Volt. Does somebody know whats wrong ,is the o2 sensor damaged or did i take the wrong line?

Thank you for helping me.

Schneemann
www.knightrider.de
Germany

 

Sounds like something isnt right. Even when o2's are bad they dont read over 1v. Is it a heated o2? The stock ones only have one wire. 02's cycle to fast for a meter to get any valuble information. Its posible that is just what your meter gets from the signal.

 

Thank you for helping me,

I have warmed up the engine but the value doesnt change between cold start and warm engine its just changing at full throttle to 1.9 Volts when driving normal its at 1.7 Volts and not changing much.

 

There are a couple things you need to check. Verify that the ground reference you are using for your meter is a good, clean ground. Also verify that the exhaust manifold is grounded to the engine with no resistance. Disconnect the O˛ sensor from the wiring harness, and check the voltage at the wiring harness connector (referenced to ground). You should read about 450mV (˝VDC). If not, you'll need to check all the ECM connections, and especially the grounding for the ECM.

 

where are the grounds for the ecm?