Diagnostic mode 3: Check DTC Memory
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