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Look it up in the Chiltons. I think it's function 4 or something...you'll get a code during starting (I think you'll have to check fast because apparently you have a slow start rather than a no-start) indicating the lack or presence of a CPS signal.
Otherwise, just replace the thing.
On my 90, the shop replaced the FI and RF (B230FT) relays on GP...a year later the car was towed out of a highrise basement (work, #$%$#%) and the dealer replaced the CPS.
MUCH cheaper to replace these three items at around 100K and avoid the tow.
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