Diagnostic Mode 03 - Read DTC Memory

Diagnostic Mode 03 - Read DTC Memory

Diagnostic Mode 03 makes it possible to read emissions-related faults (confirmed DTCs: faults which have activated the MIL) in the ECM and in the TCM.

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

SAE Diagnostic Trouble Codes

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 Network communication DTC

Norm code:
P 0 x x x trouble codes defined by SAE with specified malfunction texts
U 0 x x x
P 1 x x x additional emission relevant DTCs provided by manufacturer
U 1 x x x
P 2 x x x trouble codes 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

Repair group:
P x 0 x x Fuel and air metering and auxiliary emission controls
U x 0 x x Network, electrical
P x 1 x x Fuel and air ratio
U x 1 x x Network, communication

Repair group:
P x 2 x x Fuel and air ratio
U x 2 x x Network, communication
P x 3 x x Ignition system
U x 3 x x Network, software
P x 4 x x Additional emissions regulation
U x 4 x x Network, data
P x 5 x x Speed and idle regulation
P x 6 x x Control module and auxiliary outputs
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 when engine does not start:
- Operate starter for approx. 6 seconds. Do not switch off ignition afterwards.

- 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 P2096
- SAE P3xxx-DTCs P3078.

- Erase DTC memory, Diagnostic Mode 04 - Erase DTC Memory diagnostic mode 4: Reset/erase diagnostic data.

NOTE:
- The DTC table is sorted by SAE code.
- Malfunctions related to EPC are also indicated by Electronic Power Control (EPC) Warning Lamp -K132- ("EPC Warning lamps") in instrument cluster.
- "Emissions" -related functions are also indicated by the Malfunction Indicator Lamp (MIL) in the instrument cluster.
- 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 02 - Read Operating Conditions Diagnostic mode 2: Check operating conditions.
- Erase DTC memory after repairing malfunction, Diagnostic Mode 04 - Erase DTC Memory 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