Diagnostic Mode 04 - Erase DTC Memory: Notes

Diagnostic Mode 04 makes it possible to erase the DTC memory and to reset all emissions-related diagnostic data. In that way, all faults in the DTC memory in the ECM and TCM are erased. The adaptation values may also be reset.

Emissions-related diagnostic data includes (as applicable): 

• -MIL Status
• -Number of DTCs
• -Readiness Bits
• -Confirmed DTCs
• -Pending DTCs
• -DTC that belongs to freeze frame
• -Freeze frame data
• -Test results of specific diagnostic functions
• -Distance driven with "MIL ON"
• -Number of Warm-Up Cycles after erasing the DTC memory
• -Distance driven after erasing the DTC memory
• -Misfire counter

Depending on scan tool and protocol used, the information displayed in diagnostic mode 04 may be referred to by different names such as OBDMID (TID), Hex-ID, Component-ID (CID), On-Board Diagnostic Monitor Identifier (OBDMID), or contain no name at all and be referenced by only a number.