Reading Diagnostic Trouble Codes

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 DTCs 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 DTCs 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:

Indication example Explanation
P0444 SAE Diagnostic Trouble Code (DTC)
Evaporative Emission (EVAP) Malfunctioning wiring path or
Canister Purge Regulator Valve malfunctioning component
Circuit Open Malfunction type as next

- Refer to the following DTC tables for the diagnostic repair procedure:
- SAE P0xxxDTCs. P000A
- SAE P1xxx-DTCs. P1702
- SAE P2xxxDTCs. P2004
- SAE P3xxxDTCs. P3081
- SAE U0xxxDTCs. U0001

- Switch the ignition off.
- End of diagnosis.