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Diagnostic Mode 3: Check DTC Memory



Mode 3: Check DTC Memory
This diagnostic mode indicates all stored DTCs of components and systems which are emission relevant.

Malfunction Indicator Lamp (MIL) -K83- in instrument cluster lights up for one DTC entry.

SAE Diagnostic Trouble Codes (DTCs)
The DTC consists of a 5-digit alpha-numeric value with the following meaning:










Check DTC Memory

Work procedure
- Connect diagnostic tester. Diagnostic Tester, Connecting
- Start engine and let run at idle.


NOTE: If the engine does not start, crank engine using starter for at least 5 seconds, do not switch off ignition afterward under any circumstances.


- In diagnostic function "33 - OBD", select "Mode 3: Check DTC memory."

The number of stored malfunctions or "0 malfunctions detected" is displayed.


NOTE:
- The DTC tables are sorted by SAE code.
- Stored malfunctions of Engine Control Module (ECM) are displayed under "10 - Engine electronics" and stored malfunctions of Transmission Control Module (TCM) are displayed under "1A - Transmission electronics".
- In addition, emission-relevant malfunctions are indicated in the instrument cluster via the Malfunction Indicator Lamp (MIL) -K83-.
- E-Gas -relevant malfunctions are also indicated by the Electronic Power Control (EPC) Warning Lamp -K132- ("EPC warning lamp") in the instrument cluster.
- In "Mode 2: Check operating conditions", it can be determined at which operating condition the Engine Control Module detected and stored a malfunction. Diagnostic Mode 2: Checking Operating Conditions


Indication example Explanation
P0444 SAE Diagnostic Trouble Code (DTC)
Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- malfunctioning wiring path or malfunctioning component
Open circuit Malfunction type as text

- Repair stored malfunction(s) according to DTC table:
- SAE P0xxx-DTCs P0010
- SAE P1xxx-DTCs P1176
- SAE P2xxx-DTCs P2101

Final procedures
The following work steps must be performed in the described sequence after the malfunction(s) have been repaired:
1 - Check DTC memory "Mode 3: Check DTC memory". Diagnostic Mode 3: Check DTC Memory
2 - If necessary, erase DTC memory "Mode 4: Reset/erase diagnostic data". Diagnostic Mode 4: Reset/Erase Diagnostic Data
3 - Generate readiness code. Readiness Code, Generating

- End diagnosis and switch ignition off.
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