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Two-Trip Detection Logic

Two-trip detection logic is used to prevent erroneous malfunction detection. When a malfunction initially occurs, Diagnostic Trouble Code (DTC) will be temporarily stored in ECM memory, but MIL on instrument panel will not illuminate.

The second time that a malfunction is detected, MIL on instrument panel will illuminate, provided ignition is turned off and then back on after first malfunction was detected. This is referred to as 2-trip detection logic and only applies to specified DTCs.

NOTE: When road testing vehicle in CHECK mode (Lexus scan tool only), two trip detection logic will be disabled, and MIL will illuminate first time a malfunction is detected.
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