The Relation Between DTC And Driving Pattern In EOBD System
- When the same malfunction is detected and maintained during two sequential driving cycles, the MIL will automatically illuminate.
- The MIL will go off automatically if no fault is detected after 3 sequential driving cycles.
- A Diagnostic Trouble Code (DTC) is recorded in ECM memory when a malfunction is detected after two sequential driving cycles. The MIL will illuminate when the malfunction is detected on the second driving cycle.
If a misfire is detected, a DTC will be recorded, and the MIL will illuminate, immediately after a fault is first detected.
- A Diagnostic Trouble Code (DTC) will automatically erase from ECM memory if the same malfunction is not detected for 40 driving cycles.NOTE:
- A "warm-up cycle" means sufficient vehicle operation such that the coolant temperature has risen by at least 40 degrees Fahrenheit from engine starting and reaches a minimum temperature of 160 degress Fahrenheit.
- A "drivings cycle" consists of engine startup, vehicle operation beyond the beginning of closed loop operation.