SEAT Workshop Service and Repair Manuals

If the fault memory has been erased, the engine control unit looses all the learnt values for Lambda, idling speed and charge pressure. Therefore substantial problems in driving characteristics may occur depending on vehicle mileage.

In this case:

• ‒ Perform idling check
  
• ‒ Perform a longer test drive until the poor driving characteristics are eliminated.

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required

• ◆ Fault reader V.A.G 1551 (or vehicle system tester V.A.G 1552) with cable V.A.G 1551/3

Work sequence

Note:

All functions which could previously be performed with V.A.G 1551/1552 can also be performed with the new tester VAS 5051.

• ‒ Connect fault reader V.A.G 1551 (V.A.G 1552). Start engine and select "Address word" 01 of engine control unit. When doing this the engine must be running at idling speed.
  (Connecting fault reader and selecting engine control unit => Page 01-10.)

Only when engine does not start:

• ‒ Operate starter for approx. 6 seconds and then do not switch off the ignition.

• ‒ Switch on fault reader printer with the print key. The warning lamp in key must light up.

• ‒ Operate fault reader taking into account the information on the display:
• ‒ Press keys 0 and 2 for function "Interrogate fault memory" and confirm entry with Q key.

If no fault is stored:

• ‒ Press ⇒key.

If one or more faults are stored:

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

• ‒ Press keys 0 and 5 for the function "Erase fault memory" and confirm entry with Q key.

Note:

If the ignition is switched off between "Interrogate fault memory" and "Erase fault memory", the fault memory will not be erased. Some faults (e.g. EPC) can only be erased after switching the ignition off and on once.

• ‒ Press ⇒key.

• ‒ Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
• ‒ Rectify faults printed out using fault table:
  SAE P0 codes=> Page 01-44