DTC Memory, Checking and Erasing (Functions 02 and 05)

DTC Memory, Checking And Erasing (Functions 02 And 05)

If the voltage supply is interrupted, the engine control module loses all the "learned" and/or "basic" values for oxygen sensor control, idling speed and charge pressure. Therefore considerable driving characteristic problems may occur depending on vehicle mileage.

In this case:
- Perform idling check. Idle Speed, Checking
- Perform a longer test drive until the poor driving characteristics are eliminated.

Special tools and equipment
- V.A.G1551 scan tool (or V.A.G1552 mobile scan tool) with V.A.G1551/3B cable

Work sequence

NOTE: All functions which could previously be performed with V.A.G1551/1552 can also be performed with the new tester VAS5051.

- Connect V.A.G1551 scan tool (V.A.G1552). Start engine and select "Address word" 01 of engine control module. When doing this the engine must be running at idling speed. (Connecting scan tool and selecting engine control module. [1][2][3]Connecting VAG 1551 Scan Tool)

NOTE: Only when engine does not start:

- Operate starter for approx. 6 seconds and then do not switch off the ignition.
- Switch on scan tool printer with print key. The warning lamp in key must light up.

Indicated on display:

Rapid data transfer HELP
Select function XX

- Operate scan tool taking into account information on display.
- Press keys 0 and 2 for function "Check DTC Memory" and confirm entry with Q key.

The number of malfunctions stored or "No DTC recognized!" will be shown on the display.

X DTCs recognized.

NOTE: If no DTC is stored:

- Press -> key.

If one or more DTCs are stored:

The stored DTCs will be displayed and printed out one after the other.

After the stored DTCs have been printed out, the display will show:

Rapid data transfer HELP
Select function XX

- Press keys 0 and 5 for the function "Erase DTC Memory" and confirm entry with Q key.

Indicated on display:

Rapid data transfer ->
DTC memory is erased

NOTE: If the ignition is switched off between "Check DTC Memory" and "Erase DTC Memory" the DTC memory will not be erased.

- Press -> key.

Indicated on display:

Rapid data transfer HELP
Select function XX

- Press keys 0 and 6 for the function "End Output" and confirm entry with the Q key.
- Repair malfunctions printed out using DTC table:
SAE P0 codes.
SAE P1 codes.

- Re-generate readiness code: Monitors, Trips, Drive Cycles and Readiness Codes