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.

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

• Depending on scan tool and protocol used, diagnostic mode 03 and the information provided may be referred to by a different name.

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

P-Codes









U-Codes





Procedure

- Connect the scan tool.

- 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 scan tool screen.

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





Refer to the following DTC tables for the diagnostic repair procedure:

• SAE P0xxxDTCs. => [ SAE P0XXX DTCs ] P Code Charts.

• SAE P1xxx-DTCs => [ SAE P1XXX DTCs ] P Code Charts.

• SAE P2xxxDTCs. => [ SAE P2XXX DTCs ] P Code Charts.

• SAE P3xxxDTCs. => [ SAE P3XXX DTCs ] P Code Charts.

• SAE U0xxxDTCs, => [ SAE U0XXX DTCs ] U Code Charts.

- Switch the ignition off.

- End of diagnosis.