Speedometer/odometer inop. ABS light

[SunlitComet]

think the lower one in pic is the vss circuit. light green/black - purple/white. pcm pins 29 and 30 respectively on the c-1 blue connector.

 

[tgui]

think the lower one in pic is the vss circuit. light green/black - purple/white. pcm pins 29 and 30 respectively on the c-1 blue connector.

Pins 20/21 on red connector. Just checked. 1600ohm to VSS, drivers side at the end of the transfer case for my 02 Yukon.

Speedo works! Still getting a P1860 on my 4l80e swap so stuck in limp mode. Still making forward progress.

 

[SunlitComet]

well you might have mention this was a nbs tahoe AND NOT OBS.

 

[tgui]

Shit!!! I found this thread through a google search. You're right, my bad. It helped me thing through my probs so I thought I'd contribute what I found.

DO'h!!!!!!

 

[SunlitComet]

p1860 is a open or short in the tcc pwm circuit in a 4l80e. brown wire from tranny to pin 2 of c2 on the pcm. it normally just locks out the tcc and jacks up line pressure but if it went into limp mode perhaps the tranny power feed went out instead. this is for a 2002.