Entering ECM Code Snapshot
WARNING: This page is about a different car, the 1990 Cadillac Fleetwood and 1990 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 the ECC panel. This will switch display from ".7.0" to "E.9.0". With "E.9.0" displayed, depress the ECON and WARMER buttons on the ECC panel. Display will now enter ECM code snapshot mode and the displayed codes will be prefixed by the letter "L".