Wideband nvram help

[Clutch.it]

Vs v8 auto commodore nvram spartan 2 controller. So install spartan 2 and gauge and it worked fine afr was 14.7 running good but when i connect the spartan 2 to the pcm 424 the afr went to 16.8 and now when i disconnected it goes to 12 afr now i don't know what happened any ideas what i have done.

[Holden202T]

are you referring to the gauge in data logs ?

there is also a resistor in a 424 that you sometimes need to remove to fix wideband readings.

[vlad01]

16.8, then 12 sounds like the sequencer in the controller. It should go 20, 16.66, 13.33 and 10 iirc for a few sec on power up. You use the 0v and 5v values in the tune to adjust until the sequencer readout matches those figures in tuner pro and then you know the ECU and WB are calibrated together.

[antus]

Yep just to make it clearer, calibration values, not real wideband readings, when the controller powers on. If its doing it while the car is running, it might be a loose power connection resetting the wideband controller.

[Clutch.it]

Ok so i am talking about when the engine is idling the gauge that comes with the spartan 2 kit is reading 12 afr when the spartan 2 is not connected when it is connected it pin d8 it is at 16.8 afr .
Its a brand new spartan 2 controller kit i am thinking its now stuff i checked all the wiring to day is there a different pin to put it in.

[vs ss]

Did you remove the 1k resister from the pcm to prevent any offset?

[Kevspec]

You need to remove resistor and calibrate in ecu I had same issue

[Clutch.it]

Has anyone have a photo of the 1k resistor in a 424 computer I can only find a photo of a 808 computer

['quipt4it]

Hi Clutch.it
Hit the green FAQ button (top right)
under SOFTWARE/ OSE 11p click link
At the bottom of VL400's 1st post download the attachment '11P V104_3.zip'
Page 11 of the PDF 11P Overview has the pic.