Diagnostic Mode 03 - Read DTC Memory

Diagnostic Modes

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.

The following table provides a link to all diagnostic modes that monitor all components and systems which influence the emission quality.

• Depending on scan tool and protocol used, the information displayed may be referred to by different names such as Test-ID (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.

Diagnostic Mode 03 - Read DTC Memory

Diagnostic Mode 03 makes it possible to read emissions-related faults (confirmed DTCs: faults which have activated the MIL) in the ECM and in the TCM.

When the Engine Control Module (ECM) recognizes an emission related fault it turns on the Malfunction Indicator Lamp (MIL) or if a Electronic Throttle Malfunction is recognized, the Engine Control Module (ECM) turns on the Electronic Power Control (EPC) Warning Lamp which are both located in the instrument cluster.

Diagnostic Mode 03 is used to retrieve and view any DTC which may be stored in the Engine Control Module (ECM).

The DTC's are sorted by SAE code with the DTC tables consisting of a 5-digit alpha-numeric value.

The following tables provide a breakdown and explanation of the DTC code.

P-Codes









U-Codes





Interrogating Fault Memory

Procedure

- Connect the diagnostic tester.

- Switch the ignition to the "ON" position.

- Select "Diagnostic Mode 03: Interrogating fault memory ".

- The stored DTC or DTC's will be displayed on the diagnostic tester screen.

The following table is an example of the DTC information that may be displayed on the diagnostic tester screen:





- Switch the ignition off.

- End of diagnosis.