CEL with A/F ratio meter

[AJKS]

I have a Halmeter AF 30 installed on my 2002 NSX. When it is hooked up I get a CEL on the O2 sensor it monitors. The Halmeter is wired like any other A/F ratio monitor Autometer, ect. As I understand it the meter reads a signal from the O2 sensor but has a low amount of voltage on the Halmeter read wire. That is what is causing the CEL light, for the O2 sensor reads via voltage and the little bit that comes from the read wire from the Halmeter throws it out of whack, then CEL comes on.
Any ideas on how to resolve this? I was thinking a diode perhaps.

 

[Larry Bastanza]

Are you saying you connected the "input" on the A/F meter directly to the output of the 02 sensor? Which sensor? The stock 02 sensor is not a Wide Band so your A/F meter may not read true A/F readings if connected to a narrow band stock 02 sensor.

Can you provide some additional details about your sensor hook up.

HTH,
LarryB

 

[AJKS]

Are you saying you connected the "input" on the A/F meter directly to the output of the 02 sensor? Which sensor? The stock 02 sensor is not a Wide Band so your A/F meter may not read true A/F readings if connected to a narrow band stock 02 sensor.

Can you provide some additional details about your sensor hook up.

HTH,
LarryB

Larry

Hey, glad you asked. I know the stock O2 is not wide band but it will do for a trend monitoring. What I mean is it will be at a value of X, if I intro Nitrous it will be at that value if the same A/F is present. If it is a bit rich it will change one way if lean it would change another.
What I did was via Halmeter instructions. On the first O2 sensor, (OBD2) in the header, you put a wire tap on the sensor wire. This tap is were the Halmeter gets its info from. The problem is that the read wire has a bit of voltage and is throwing the O2 readings to the ECU off.
I plan on installing the M300, but it is a few weeks out. Here is the link.
http://www.plxdevices.com./M-Series_productinfo.htm