Odp: o2 ecm current draw

[Marek Skrzypiec]

I made some o2 emulator .It's square-wave 2 Hz generator , based on very
popular IC 555 and some resisistors and caps.The amplitude is changed
beetwen
0 - 0.8v
Marek
-----WiadomoϾ oryginalna-----
Od: David Cooley <n5xmt at bellsouth.net>
Do: gmecm at efi332.eng.ohio-state.edu <gmecm at efi332.eng.ohio-state.edu>
Data: 30 wrzeœnia 1999 15:57
Temat: Re: o2 ecm current draw


>At 01:34 AM 9/30/1999 -0400, you wrote:
>>Hi
>>
>>I want to send false O2 voltages to the ecm. The DAC I was looking at
using
>>can source or sink 5 mA. Is that enough current to drive the ecm a/d.
>
>
>That is more than enough current... An O2 sensor can be damaged by the
>current draw of a standard VOM so it's output is on the order of microamps.
>The problem with using a simulated voltage is the ECM has to see
>transitions from rich to lean and back or it sets a code for faulty O2
sensor.
>
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