Display Group 12, Field 3, Ignition Timing Point Map Switching

1st ignition map (basic map) or 2nd ignition map (map with reduced angles) should be displayed. Ignition timing point map is selected by knock regulation. PCM selects 2nd map if quality of fuel is poor, abnormal engine noise occurs (loose components, etc.) or oil combustion is occurring due to piston damage. If PCM recognizes a knock sensor fault, ignition map switching is blocked. If PCM selects 2nd map, see DISPLAY GROUPS 13 and/or 14 for more exact evaluation.