PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

O2 Sim is just a diode?

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Old Apr 14, 2007 | 07:33 AM
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Default O2 Sim is just a diode?

Read an interesting post from 2006,where a guy said to put a particular diode in line with wires from O2 sensor to fool PCM, leaving the heater circuit intact.So the sim disconnects the heater also but must just be a diode or resistor,right ?
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Old Apr 14, 2007 | 11:26 AM
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Not that simple The O2 Sim uses a 555 timer with 4 resistors, 2 capacitors and 2 LED's. With parts from Radio Shack, they are ~$15 to make. A far cry from $50 each. A friend of mine made them for his Supra and they work like a champ.

Last edited by Blacker; Apr 14, 2007 at 12:36 PM.
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Old Apr 14, 2007 | 12:29 PM
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Ok,can you tell though,if you left the O2 installed with the heater circuit still running,would the diode alone work?
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Old Apr 14, 2007 | 12:38 PM
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What exactly are you trying to accomplish with just a diode?
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Old Apr 14, 2007 | 12:48 PM
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To fool the PCM into thinking the cat is still there and working A-OK
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Old Apr 14, 2007 | 01:23 PM
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No, that will not work
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Old Apr 14, 2007 | 02:45 PM
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OK,Thanks.After reading this old thread I found in a search,I thought I'd ask.I linked the thread in case any of you might find it interesting.

https://ls1tech.com/forums/showthread.php?t=550150&referrerid=63909
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Old Apr 14, 2007 | 02:49 PM
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https://ls1tech.com/forums/showthrea...ferrerid=63909

This one works!
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