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Old 09-01-2008, 06:49 AM   #1
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Default PCM wire for 02 Sensor reporting, '04 Silverado

I'm too lazy to look for it, I figure somebody here knows off the top of their head. Which pcm wire is the lead for AFR gauge signal on a 2004 Silvy SS?


BTW, don't ask me why I'm logged in under my wife's S/N.
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Old 09-01-2008, 12:35 PM   #2
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I didn't know there was one. I was wondering about this myself on my way to work.
Bump.
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Old 09-01-2008, 01:09 PM   #3
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PCM Blue Connector:

Pin 25: Tan Wire: HO2S Low Signal, Bank 2 Sensor 2
Pin 26: Tan Wire: HO2S Low Signal, Bank 2 Sensor 1
Pin 27: Blk/Wht: Ground
Pin 28: Tan/Wht: HO2S Low Signal, Bank 1 Sensor 2
Pin 28: Tan Wire: HO2S Low Signal, Bank 1 Sensor 1

Pin 65: PPL Wire: HO2S High Signal, Bank 2 Sensor 2
Pin 66: PPL Wire: HO2S High Signal, Bank 2 Sensor 1
Pin 67: Blk/Wht : Ground
Pin 68: PPL/Wht: HO2S High Signal, Bank 1 Sensor 2
Pin 69: PPL/Wht: HO2S High Signal, Bank 1 Sensor 1

Prolly more info than you wanted, but depending on which side you're aiming for, i'd say you wanna tap pin 69, or 66... purple wires either way.
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Old 09-01-2008, 02:57 PM   #4
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Quote:
Originally Posted by NyteSnyper View Post
PCM Blue Connector:

Pin 25: Tan Wire: HO2S Low Signal, Bank 2 Sensor 2
Pin 26: Tan Wire: HO2S Low Signal, Bank 2 Sensor 1
Pin 27: Blk/Wht: Ground
Pin 28: Tan/Wht: HO2S Low Signal, Bank 1 Sensor 2
Pin 28: Tan Wire: HO2S Low Signal, Bank 1 Sensor 1

Pin 65: PPL Wire: HO2S High Signal, Bank 2 Sensor 2
Pin 66: PPL Wire: HO2S High Signal, Bank 2 Sensor 1
Pin 67: Blk/Wht : Ground
Pin 68: PPL/Wht: HO2S High Signal, Bank 1 Sensor 2
Pin 69: PPL/Wht: HO2S High Signal, Bank 1 Sensor 1

Prolly more info than you wanted, but depending on which side you're aiming for, i'd say you wanna tap pin 69, or 66... purple wires either way.

Rock out. That's what I needed. Thanks dude.
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Old 09-01-2008, 03:00 PM   #5
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So this allows the pcm to read the actual afr?
Which wire on the wideband do you use?
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Old 09-01-2008, 10:07 PM   #6
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Quote:
Originally Posted by viciousknid View Post
So this allows the pcm to read the actual afr?
Which wire on the wideband do you use?
The wires stated allow the PCM to read the voltage from the sensor which it then has stuff within itself to calculate out into AFR for its own use in its various ways to verify and/or maintain proper fueling.

A wideband sensor will come with its own wires out of the sensor/module and wiring diagram to show which wires to use for what.

Now if ur talkin about taking the wideband output through the O2 sensors factory wiring into the PCM for it to read, i dont very much recommend that due to the fact that most wideband outputs are 5v and the factory O2 sensors only send 1v signals... If you're gonna try to squeeze all that signal from the wideband into the 1v (which is possible either using resistors; or some wideband's outputs are programmable) its going to lose those 4v of resolution to get the tune more spot-on.
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Old 09-02-2008, 06:38 PM   #7
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oh okay. so your just talking about the regular o2's. when you said AFR gauge i assumed wideband. I know what your talking about with the voltage. I used that to see that my O2 was bad and also to tune with STFT's.
Gotcha.
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Old 09-02-2008, 06:38 PM
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