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 loss of or invalid Sensing Diagnostic Module (SDM) serial data to the PCM. When such condition exists for one second, DTC will set.