DTC memory of Engine Control Module (ECM), checking (scan tool function 02) and erasing (scan tool function 05)

When DTC memory is erased, the Engine Control Module (ECM) forgets all oxygen sensor and charge pressure adaptation values. Depending on vehicle's mileage, this can cause substantial problems with running characteristics.

If this occurs:

Perform idle test. Refer to Idle, checking
Perform a longer road test, until problems with running characteristics are eliminated.

Special tools and equipment

VAG1551 Scan Tool (or VAG1552 mobile scan tool) with VAG1551/3 cable

Work procedure

NOTE: All functions previously performed with the VAG1551/1552 can also be performed using the new VAS5051 tester.

Connect VAG 1551 scan tool (VAG1552). Start engine and select Engine Control Module (ECM) using address word 01 (connecting scan tool and selecting ECM. Refer to VAG1551 Scan Tool (ST), connecting and selecting "Engine Electronics" address word 01 ).

Only if engine does not start:

Operate starter for approx. 6 seconds. Do not switch ignition off afterward.
Press -Print- button to turn on Scan Tool (ST) printer. Indicator lamp in button must light up.

Rapid data transfer HELP
Select function XX

Indicated on display

Operate scan tool according to indications on display:
Press buttons -0- and -2- to select "Check DTC Memory" function 02. Press -Q- button to confirm input.

X DTC recognized

Number of stored DTCs or "No DTC recognized" will be indicated on display.

If no DTCs are stored:

Press → button.

If one or more DTCs are stored:

The stored malfunctions are displayed and printed out one after the other.

Ground (GND) connections between engine and chassis must be OK.

Rapid data transfer HELP
Select function XX

After stored malfunctions have been printed out, display indicates:

Press buttons -0- and -5- to select "Erase DTC Memory" function 05. Press -Q- button to confirm input.

Rapid data transfer →
DTC Memory is erased!

Indicated on display

NOTE: If ignition was switched off between the steps "Check DTC memory" and "Erase DTC memory", DTC memory will not be erased.

Press → button.

Rapid data transfer HELP
Select function XX

Indicated on display

Press buttons -0- and -6- to select "End Output" function 06. Press -Q- button to confirm input.
Repair malfunctions that were printed out using DTC table:

SAE P0-Codes. Refer to Diagnostic Trouble Code (DTC) table: SAE P0-Codes

SAE P1-Codes. Refer to Diagnostic Trouble Code (DTC) table: SAE P1-Codes

Generate readiness code again. Refer to Readiness code, generating .