Diagnostic mode 3: Check DTC Memory
WARNING: This page does not describe the selected car, but rather 14 other vehicles, including the 2005 Volkswagen GTI, 2004 Volkswagen R32, 2004 Volkswagen Jetta, 2004 Volkswagen GTI, and 2003 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
Function
This diagnostic mode indicates all stored DTCs of components and systems which are emission relevant.
SAE Diagnostic Trouble Codes (DTCs)
The DTC always consists of a 5-digit alpha-numeric value with the following meaning:
| Component group: | |||||||
| P x x x x | DTC for drivetrain | ||||||
| U x x x x | DTC for network communication | ||||||
| Norm-Code: | |||||||
| P 0 x x x | DTCs defined by SAE with specified malfunction texts | ||||||
| U 0 x x x | |||||||
| Norm-Code: | |||||||
| P 1 x x x | additional emission relevant DTCs provided by manufacturer | ||||||
| U 1 x x x | |||||||
| P 2 x x x | DTCs defined by SAE with specified malfunction texts | ||||||
| U 2 x x x | additional emission relevant DTCs provided by manufacturer | ||||||
| P 3 x x x | additional emission relevant DTCs provided by manufacturer | ||||||
| U 3 x x x | |||||||
| System group: | |||||||
| P x 0 x x | Fuel and air ratios and additional emission regulations | ||||||
| U x 0 x x | Network, electrical | ||||||
| P x 1 x x | Fuel and air ratios | ||||||
| U x 1 x x | Network, communication | ||||||
| P x 2 x x | Fuel and air ratios | ||||||
| U x 2 x x | Network, communication | ||||||
| System group: | |||||||
| P x 3 x x | Ignition system | ||||||
| U x 3 x x | Network, software | ||||||
| P x 4 x x | additional exhaust regulation | ||||||
| U x 4 x x | Network, data | ||||||
| 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 | ||||||
Work procedure
- Connect diagnostic tester. Refer to Diagnostic tester, connecting
- Start engine and let run at idle.
NOTE:
Only if engine does not start:
- Operate starter for approx. 6 seconds. Do not switch ignition off afterward.
- Under address word 33, select "Diagnostic mode 3: Check DTC memory."
The number of stored malfunctions or "0 malfunctions detected" is displayed.
- End diagnosis and switch ignition off.
- Repair stored malfunctions according to DTC table:
- SAE P0xxx-DTCs. Refer to SAE P0xxx-DTCs
- SAE P1xxx-DTCs. Refer to SAE P1xxx-DTCs
- SAE P2xxx-DTCs. Refer to SAE P2xxx-DTCs
- SAE P3xxx-DTCs. Refer to SAE P3xxx-DTCs
- SAE U0xxx-DTCs. Refer to SAE U0xxx-DTCs
NOTE:
- The DTC table is sorted by SAE codes.
- "EPC"-relevant malfunctions are also indicated by the warning lamp for Electronic Power Control ("EPC warning lamp") in the instrument cluster.
- "Emission"-relevant malfunctions are additionally indicated in the instrument cluster via the exhaust Malfunction Indicator Lamp (MIL).
- In Diagnostic mode 2, it can be determined at which operating condition a malfunction was detected and stored by the Engine Control Module (ECM). Refer to Diagnostic mode 2: Check operating conditions
- Erase DTC memory after repairing malfunction. Refer to Diagnostic mode 4: Reset/erase diagnostic data
Display example:
P0444
Evaporative Emission System Purge Control Valve Circuit Open
Explanation:
- P0444 = SAE diagnostic trouble code (malfunction identification number).
- Evaporative Emission System Purge Control Valve = malfunctioning wiring path or malfunctioning component.
- Circuit Open = Malfunction type as text