Circuit Description
WARNING: This page is about a different car, the 1998 Cadillac Seville, 1998 Cadillac Eldorado, and 1998 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
This test checks for too many 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 more than eight 4X reference pulses between cam pulses, DTC will set.