Changeover to 4l60e & f.i. on olds 403 w/95 c1500 truck bjyk 16197427 ecm. I have a factory scan tool & a digital oscilloscope.The B+& B- check good. The speed sensor output, & the vss buffer square waves on c11 & c13 look ok to me. The scan tool sees vehicle speed & the trans shifts ok. The speedo output on c15 is not there. I am at a loss as to why there is no vssb speedo output. Anybody have an answer ? Tried 2 vssb's - no help, but both work on my 94 s10 w/7427 ecm.
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