Entering PCM Code Snapshot
WARNING: This page is about a different car, the 1991 Cadillac Fleetwood and 1991 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
With ".7.0" displayed on the FDC (to cause ".7.0" to be displayed on the FDC, see INTRODUCTION TO DIAGNOSTIC TESTING under DIAGNOSTIC TESTING), depress and release the LO button on ECCP. This will switch display from ".7.0" to "E.9.0". With "E.9.0" displayed, depress ECON and WARMER buttons on ECCP. Display will now enter PCM code snapshot mode and the displayed codes will be prefixed by the letter "L".