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

SAE Diagnostic Trouble Codes (DTCs)
The DTC always consists of a 5-digit alphanumeric value with the following meaning:
Component group:
- Pxxxx = DTC for drivetrain.

Norm-Code:
- P0xxx = DTCs defined by SAE with specified malfunction texts.

System group:
- Px0xx = Fuel and air ratio and additional emission regulations
- Px1xx = Fuel and air ratio.
- Px2xx = Fuel and air ratio.
- Px3xx = Ignition system.
- Px4xx = additional emission regulation.
- Px5xx = Speed and idle control.
- Px6xx = Control module and output signals.
- Px7xx = Transmission.
- Px8xx = Transmission.
- Px9xx = Control modules, input and output signals.

Work procedure
- Connect diagnostic tester.
- 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. P0100
- 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.
- "Emission"-relevant malfunctions are additionally indicated in the instrument cluster via the Malfunction Indicator Lamp (MIL). Meaning of 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 control module for Diesel-Direct fuel injection system, Diagnostic mode 2: Checking operating conditions. Diagnostic Mode 2: Checking Operating Conditions
- Erase DTC memory after repairing malfunction, Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data

Display example:
P0183 Fuel Temperature Sensor A Circuit High

Explanation:
- P0183 = SAE diagnostic trouble code (malfunction identification number).
- Fuel Temperature Sensor A = faulty circuit or malfunctioning component.
- Circuit High = malfunction type as text