1991 electric suburban gauges into a square ls swap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chuychevy82lwb · 11-03-2016, 12:10 PM

So guys i wanted to see if any one could help me out on this . Long story short i have got a hold of 91 burban gauge cluster and i have the voltage to work the temp (with adapter on the passanger side head and electric sender) but o cant seem to get the speedo to work i repined it and ran a wire from the 4k output to the speedo but no luck . I thought it was the speedo that was bad so i found a guy parting out a 90 burban and took thoes gauges and still nothing . Am i missing something .

87chevy.com · 11-03-2016, 07:01 PM

Quote:

Originally Posted by chuychevy82lwb

So guys i wanted to see if any one could help me out on this . Long story short i have got a hold of 91 burban gauge cluster and i have the voltage to work the temp (with adapter on the passanger side head and electric sender) but o cant seem to get the speedo to work i repined it and ran a wire from the 4k output to the speedo but no luck . I thought it was the speedo that was bad so i found a guy parting out a 90 burban and took thoes gauges and still nothing . Am i missing something .

did you repin the cluster connector or plug it directly in? if so, you have to repin it to match your truck, super simple as the printed circuit is easy to read. The speedo is simply, ground, power and vss input. nothing else. If you have the connector pinned correctly, verified power and ground is good, verified vss output, you got a bad speedo. I have a spare one or 2 in the attic

chuychevy82lwb · 11-03-2016, 07:07 PM

I repined it but it cant be the gaugues i physically saw the speedo work b4 it was pulled

87chevy.com · 11-03-2016, 09:57 PM

If you know it works, its narrowed down to the wiring or ecu. Double check the correctly pinned , power, ground and signal from the pcm. Then check the vss output sensor wires to pcm. If wiring is good pcm or pcm calibration somehow is bad
Clint

chuychevy82lwb · 11-03-2016, 10:26 PM

How would i check the vss output ? Amd what pin would i need to asure has power to rule out iys a lack of power flowing through it

LeesTruk · 11-04-2016, 05:43 AM

Check continuity from the VSS wires (Pin A ppl/wht, Pin B lt grn/blk) to the PCM connector C2 (green connector) Pin #'20 (lt.grn/blk), and Pin #21 (ppl/wht). The output wire to the speedometer is also from connector C2, pin #50 (grn/wht). Again, check continuity on this wire. If continuities are good, and terminal pins are firmly in place, then you can check VSS output by raising the rear of the truck, disconnect the VSS connecter, put your test leads on the two VSS pins, the meter on AC voltage and have someone put the truck in drive so that the rear wheels move. If you have an AC voltage reading, then the VSS is working. Or, you can just back probe the C2 connector at pins #20 and #21 for the voltage reading (probably safer). If that's good, then the PCM is most likely the culprit. Assuming, of course the connection at the speedo is good. The film circuit boards can sometimes be tricky

11-03-2016, 12:10 PM	#1
chuychevy82lwb Registered User Join Date: Mar 2013 Location: Taylor tx 76574 Posts: 135	1991 electric suburban gauges into a square ls swap So guys i wanted to see if any one could help me out on this . Long story short i have got a hold of 91 burban gauge cluster and i have the voltage to work the temp (with adapter on the passanger side head and electric sender) but o cant seem to get the speedo to work i repined it and ran a wire from the 4k output to the speedo but no luck . I thought it was the speedo that was bad so i found a guy parting out a 90 burban and took thoes gauges and still nothing . Am i missing something . __________________ 82 lwb lsx 5.3/4l60e 12 bolt rear lambo electric blue/ hummer black with house of color flake same colors on the inside with all new upholstery n 22s. " Who said longbeds cant look good "

11-03-2016, 07:07 PM	#3
chuychevy82lwb Registered User Join Date: Mar 2013 Location: Taylor tx 76574 Posts: 135	Re: 1991 electric suburban gauges into a square ls swap I repined it but it cant be the gaugues i physically saw the speedo work b4 it was pulled __________________ 82 lwb lsx 5.3/4l60e 12 bolt rear lambo electric blue/ hummer black with house of color flake same colors on the inside with all new upholstery n 22s. " Who said longbeds cant look good "

11-03-2016, 09:57 PM	#4
87chevy.com BMW & ASE Master Certified Join Date: Feb 2004 Location: Houston, Texas Posts: 1,266	Re: 1991 electric suburban gauges into a square ls swap If you know it works, its narrowed down to the wiring or ecu. Double check the correctly pinned , power, ground and signal from the pcm. Then check the vss output sensor wires to pcm. If wiring is good pcm or pcm calibration somehow is bad Clint __________________ 1987 Silverado - L83 5.3 w/ 6L80e ,A/C,P/W,P/L,TILT, HID projectors, Wilwood C-10 Pro Spindles w/ 2018 silverado front brakes & C-5 Corvette Rear Disc Brakes 1999 BMW 528i - 5.7 LS1 w/ 4l60e, Ford 8.8 IRS w31 spline posi & FX-r projector retrofit New project: 2006 BMW x5 6cyl AWD to L83 6l80e 4wd to 2WD / RWD A poor man buy's it twice finally got my domain name back, 87chevy.com.... site rework in progress Last edited by 87chevy.com; 11-03-2016 at 10:24 PM.

11-04-2016, 05:43 AM	#6
LeesTruk Registered User Join Date: Mar 2015 Location: Manchester, CT Posts: 433	Re: 1991 electric suburban gauges into a square ls swap Check continuity from the VSS wires (Pin A ppl/wht, Pin B lt grn/blk) to the PCM connector C2 (green connector) Pin #'20 (lt.grn/blk), and Pin #21 (ppl/wht). The output wire to the speedometer is also from connector C2, pin #50 (grn/wht). Again, check continuity on this wire. If continuities are good, and terminal pins are firmly in place, then you can check VSS output by raising the rear of the truck, disconnect the VSS connecter, put your test leads on the two VSS pins, the meter on AC voltage and have someone put the truck in drive so that the rear wheels move. If you have an AC voltage reading, then the VSS is working. Or, you can just back probe the C2 connector at pins #20 and #21 for the voltage reading (probably safer). If that's good, then the PCM is most likely the culprit. Assuming, of course the connection at the speedo is good. The film circuit boards can sometimes be tricky

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11-03-2016, 10:26 PM	#5
chuychevy82lwb Registered User Join Date: Mar 2013 Location: Taylor tx 76574 Posts: 135	Re: 1991 electric suburban gauges into a square ls swap How would i check the vss output ? Amd what pin would i need to asure has power to rule out iys a lack of power flowing through it __________________ 82 lwb lsx 5.3/4l60e 12 bolt rear lambo electric blue/ hummer black with house of color flake same colors on the inside with all new upholstery n 22s. " Who said longbeds cant look good "



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