Circuit Description
WARNING: This page is about a different car, the 1996 Cadillac Seville, 1996 Cadillac Eldorado, and 1996 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
This test checks for too few 4X reference pulses between cam pulses. PCM checks to see if there are forty eight 24X reference pulses between cam pulses, and if there are, the PCM assumes it is receiving valid cam pulses. Therefore, if PCM see less than eight 4X reference pulses between cam pulses, DTC will set.