Diagnostic Trouble Code(s) (DTC)

• DTC is a code consisting of 9-digit alphanumeric characters which are stored when each module detects a malfunction.
• The first 5 digits of the DTC indicate which system or part and what kind of malfunction is occurring. Digits 6 to 7 add more detailed information on the malfunction content (such as open/short circuit, characteristic malfunction).
• The last 2 digits of the DTC are called status byte indicating malfunction conditions such as pending code, past/current malfunctions, and the warning light illumination condition.

Courtesy of MAZDA MOTORS CORP.

Current malfunction 

• Malfunction being detected by current drive cycle

Past malfunction 

• Malfunction detected by past drive cycle, but with current drive cycle, status is determined as normal

• DTCs can be read out by implementing a quick check or an on-demand self-test using the M-MDS. (See DTC INSPECTION .)
• Status byte can be read out by implementing a quick check using the M-MDS. (See DTC INSPECTION .)
• For details on the status byte, verify the explanation displayed on the M-MDS screen when reading out DTCs.