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Diagnostic Trouble Codes (DTCS)

If the control module detect a fault, a diagnostic trouble code (DTC) is stored. A fault that was detected during the last operating cycle is defined as permanent. Other faults that are detected are defined as intermittent.

If for some reason a fault disappears after being stored in the control module as a diagnostic trouble code, the information remains stored in the control module. If a fault is no longer permanent, the status of the diagnostic trouble code is changed to intermittent.

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