Clearing Diagnostic Trouble Codes

Diagnostic Modes 01 - 09

The information provided in Modes 01 through 09 displays the various levels of emission related data that may be monitored, as well as the ability to retrieve and read stored DTC trouble codes, erase stored DTC trouble codes, generate readiness codes, and select the various PIDs and Test-IDs used within the modes to monitor the engine, and emission related component parameters.

• Depending on scan tool and protocol used, the information in diagnostic mode 01 may be referred to by different names such as Test-ID, Hex-ID, Component-ID (CID), or On-Board Diagnostic Monitor Identifier (OBDMID).

Diagnostic Mode 04 - Erase DTC Memory

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, diagnostic mode 04 and the information provided may be referred to by a different name.

Procedure

- Connect the scan tool.

- Switch the ignition on.

- Select Diagnostic Mode 03: Interrogating fault memory.

- Then select Mode 4: Reset/delete diagnostic data.

The scan tool will display: Diagnostic data are being erased.

- Switch the ignition off.