Diagnostic Mode 03: Interrogating Fault Memory

WARNING: This page is about a different car, the 2009 Audi A4, 2008 Audi A4, 2007 Audi A4, 2006 Audi A4, and 2005 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Description

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

Component group
P	x	x	x	x	DTC for the drivetrain
Norm-Code
P	0	x	x	x	Trouble codes defined by SAE with specified malfunction texts
P	1	x	x	x	Additional emission relevant DTCs provided by the manufacturer
P	2	x	x	x	DTCs defined by SAE with specified texts, from MY 2000
P	3	x	x	x	Additional emission relevant DTCs provided by the manufacturer from MY 2000

Component group
P	x	0	x	x	Fuel and air mixture and additional emission regulations
P	x	1	x	x	Fuel and air ratios
P	x	2	x	x	Fuel and air ratios
P	x	3	x	x	Ignition system
P	x	4	x	x	Additional exhaust system
P	x	5	x	x	Speed and idle control
P	x	6	x	x	Control module and output signals
P	x	7	x	x	Transmission
P	x	8	x	x	Transmission
P	x	9	x	x	Control modules, input and output signals

U-Codes

Component group
U	x	x	x	x	DTC for network (CAN bus)
Norm-Code
U	0	x	x	x	Trouble codes defined by SAE with specified malfunction texts

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) Canister Purge Regulator Valve	Malfunctioning wiring path or malfunctioning component
Circuit Open	Malfunction type as next

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

SAE P0xxxDTCs. → SAE P0xxx DTCs .
SAE P1xxx-DTCs → SAE P1xxx DTCs .
SAE P2xxxDTCs. → SAE P2xxx DTCs .
SAE P3xxxDTCs. → SAE P3xxx DTCs .

SAE U0xxxDTCs, → SAE U0xxx DTCs .

Switch the ignition off.
End of diagnosis.