Entering Diagnostic Mode
Turn ignition on. Depress "OFF" and "WARMER" buttons on ECC panel simultaneously and hold buttons until ".." appears on digital display panel. Release buttons and code "-1.8.8" should appear, indicating beginning of diagnostic readout. Trouble codes will be displayed beginning with lowest numbered code and be repeated a second time. After second time, trouble code ".7.0" will appear, indicating ECM is ready for next diagnostic feature. If no codes are stored, 1.8.8" will appear for longer period of time, then code ".7.0" will appear. See Fig 1.
NOTE:
Trouble code ".7.0" is a decision point. When this code is displayed, either select diagnostic feature e.g., switch test, engine data display, etc., or clear codes and then exit diagnostic mode.