Diagnostic Mode 3: Check DTC Memory

Diagnostic mode 3: Check DTC Memory

Function
This diagnostic mode indicates all stored DTCs of components and systems which are emission relevant.

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

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

Norm-Code:
P 0 x x x DTCs defined by SAE with specified malfunction texts
P 3 x x x additional emissions relevant DTCs provided by manufacturer from MY 2000

Norm-Code:
P 2 x x x DTCs defined by SAE with specified texts, from MY 2000
P 3 x x x additional emissions relevant DTCs provided by manufacturer from MY 2000

System 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 regulation
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. 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. P0010
- SAE P1xxx-DTCs. P1102
- SAE P2xxx-DTCs. P2101
- SAE P3xxx-DTCs. P3081

- Erase DTC memory, Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data

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), Diagnostic mode 2: Checking operating conditions. Diagnostic Mode 2: Check Operating Conditions
- Erase DTC memory after repairing malfunction, Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data

Display example:
P0444 Evaporative Emission (EVAP) Canister Purge Regulator ValveCircuit Open

Explanation:
- P0444 = SAE diagnostic trouble code (malfunction identification number).
- Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- = malfunctioning wiring path or malfunctioning component.
- Open circuit = Malfunction type as text