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Gary
Gary, Chevy Technician
Category: Chevy
Satisfied Customers: 11065
Experience:  15 years GM master tech
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how to replace speed sensor 1994 k1500 suburban

Customer Question

how to replace speed sensor 1994 k1500 suburban
Submitted: 3 years ago.
Category: Chevy
Expert:  Gary replied 3 years ago.
you need to know how to replace a VSS in a 1994 1500 suburban?but it states you already replaced that sensor in the transfer case rear.so why would you need to know how to change it?
Customer: replied 3 years ago.
the parts guy at advanced autoparts said their are 2 sensors speedometor not working and transmission not shifting out of low gear
Expert:  Gary replied 3 years ago.
did they sell you 2 sensors?
Customer: replied 3 years ago.
yes
Expert:  Gary replied 3 years ago.
is this a 4L80 or a 4L60 transmission?
Customer: replied 3 years ago.

not sure how do you tell

 

Expert:  Gary replied 3 years ago.
which style transmission pan do you have the 1st or the second one?
graphic
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Customer: replied 3 years ago.
second one
Expert:  Gary replied 3 years ago.
ok there is only 1 VSS which is in the tail shaft of the transfer case.if that one was changed make sure the wiring from that sensor all the way up is good.if the wiring is good more than likely the VSS buffer is not sending the speed signal to the ECM to shift it.here is where that buffer is and here is the schematic for that circuit
graphicgraphic
Customer: replied 3 years ago.
where is that buffer located
Expert:  Gary replied 3 years ago.
according to the picture passenger side under the dash.thats the best picture i have on where its located.usually the best way to find it is when you get the new buffer get under the dash in that area and match up the new one with the the old one

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Gary
Gary
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15 years GM master tech