Wideband power
Thread Starter
Joined: Jan 2002
Posts: 4,069
Likes: 74
From: Casselberry FL
Wideband power I have my existing NGK AFX wideband power connected to the IGN fuse in the door fuse panel, and the ground connected under the dash. I want to add a 2nd AFR500v2 to my MPVI2 to scan the other bank simultaneously. That IGN connection doesn't list an amperage. I definitely want it to be connected to a power source that is only on when the ignition is on, and it's convenient that the power automatically comes on. In that fuse block, the following labeled fuse sockets are unused:
#3 Steering Wheel control (1A)
#13 Steering Wheel control (1A)
BATT
ACCY
Any chance I can run both wideband controllers off the same IGN connection, or will I need to improvise a different solution to power the second unit?
#3 Steering Wheel control (1A)
#13 Steering Wheel control (1A)
BATT
ACCY
Any chance I can run both wideband controllers off the same IGN connection, or will I need to improvise a different solution to power the second unit?
Thread Starter
Joined: Jan 2002
Posts: 4,069
Likes: 74
From: Casselberry FL
TECH Regular
Joined: Dec 2005
Posts: 437
Likes: 9
From: Indianapolis
I tapped into the rear 02s and powered the sensor directly off of it then ran a leg of power to a distribution block through the shift boot. There's a decent amount of room there and I stashed the power and ground blocks there and powered all my extra gauges off of the blocks since mine only pull a few milliamps of current and the factory fuses can take a couple more amps anyway.
I did that with my current AEM setup as well as my old LC-1 I had previously too.
I did that with my current AEM setup as well as my old LC-1 I had previously too.
Thread Starter
Joined: Jan 2002
Posts: 4,069
Likes: 74
From: Casselberry FL
I'm not out of the woods. The AFX is using Analog1 & Ground1 on my MPVI, ground connected to screw under dash; .the same connections it's been connected to for the better part of a decade. I attached the new AFR500v2 to MPVI analog 2 and ground 2. AFR500v2 power comes from previously unused ACCY in the same fuse panel, ground connected to the same screw under the dash as the AFX.
I'm chasing some weird behavior in the scanner. My scanner was showing lambda .75 and 25% rich on both wideband transforms, so I applied a 50% correction. The next scan the controller display was closer to stoich (13-14AFR on both controller displays) but the lambda values reported by the scanner remained near .75, which caused inaccurate error calculations in the scanner. I think lambda values are wrong due to to the voltages picked up by the scanner. During controller startup, the AFX is a consistent 1.38V, and the AFR500v2 is a consistent 1.30V. Neither show 4V or 0V during the startup process per the documentation. Neither controller is showing any errors on the display.
Ideas?
I'm not sure I want to use the ACCY any more due to how it's described in this link; I don't want any parasitic power loss. The IGN is a 15A, so I think I'll go with the idea in post #8.
https://ls1tech.com/forums/stereo-el...2-12v-key.html
I'm chasing some weird behavior in the scanner. My scanner was showing lambda .75 and 25% rich on both wideband transforms, so I applied a 50% correction. The next scan the controller display was closer to stoich (13-14AFR on both controller displays) but the lambda values reported by the scanner remained near .75, which caused inaccurate error calculations in the scanner. I think lambda values are wrong due to to the voltages picked up by the scanner. During controller startup, the AFX is a consistent 1.38V, and the AFR500v2 is a consistent 1.30V. Neither show 4V or 0V during the startup process per the documentation. Neither controller is showing any errors on the display.
Ideas?
I'm not sure I want to use the ACCY any more due to how it's described in this link; I don't want any parasitic power loss. The IGN is a 15A, so I think I'll go with the idea in post #8.
https://ls1tech.com/forums/stereo-el...2-12v-key.html
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Thread Starter
Joined: Jan 2002
Posts: 4,069
Likes: 74
From: Casselberry FL
Well, I found part of the problem. At some point I forgot to plug the green EIO connector back into the MPVI 
Now that the physical connection is fixed, these are the averages during controller startup with the current wiring:
NGK AFX, input 1, I can't find a reference to a correction range in the manual, assuming same as AFR500v2 (+/- 0.08V) based upon similar design.
When outputting 1.0V, the scanner average is 0.965V
When outputting 4.0V, the scanner average is 3.939V
When outputting 0.0V, the scanner average is 0.033V
AFR500v2 input 2, manual says to correct within a range of +/-0.08V
When outputting 1.0V, the scanner average is 1.05V
When outputting 4.0V, the scanner average is 4.05V
When outputting 0.0V, the scanner average is 0.069V
Now that the physical connection is fixed, these are the averages during controller startup with the current wiring:NGK AFX, input 1, I can't find a reference to a correction range in the manual, assuming same as AFR500v2 (+/- 0.08V) based upon similar design.
When outputting 1.0V, the scanner average is 0.965V
When outputting 4.0V, the scanner average is 3.939V
When outputting 0.0V, the scanner average is 0.033V
AFR500v2 input 2, manual says to correct within a range of +/-0.08V
When outputting 1.0V, the scanner average is 1.05V
When outputting 4.0V, the scanner average is 4.05V
When outputting 0.0V, the scanner average is 0.069V
Last edited by JimMueller; Aug 18, 2020 at 05:54 PM.
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