Reading and Clearing Diagnostic Trouble Codes

ON BOARD DIAGNOSIS (SELF-DIAGNOSIS)




- The Powertrain Control Module (PCM) conducts a self-test of most of the wiring and components in the system each time the key is turned ON. If a fault is detected the PCM will store a Diagnostic Trouble Code (DTC) in memory. It's a number that corresponds to a specific problem.
- When the problem detected is important: the CHECK TRANS indicator is flashing (turned ON 0.2 seconds and OFF 0.2 seconds) until the fault is repaired and the PCM memory is cleared.