SEAT Workshop Service and Repair Manuals

Special tools, workshop equipment, test and measuring appliances and auxiliary items required

• ◆ V.A.G 1526 Hand multimeter
• ◆ V.A.G 1527 B Diode test lamp
• ◆ V.A.G 1594 A Adapter set
• ◆ V.A.G 1598/31 Test box
• ◆ Fault reader V.A.G 1551 or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3
• ◆ Current flow diagram

Test conditions

• ● The fuses must be OK.

• ● The battery voltage must be at least 11.5 V.

Test sequence

• ‒ → Pull off 6-pin connector -arrow- (grey) from EGR valve.

• ‒ → Connect multimeter to measure voltage between contacts 2 (positive) and 4 (earth) of connector using adapter cables from V.A.G 1594 A.
• ‒ Switch on ignition.
      Specification: min. 4.5 V

If the specification is not attained:

• ‒ Switch off ignition.

• ‒ First check whether a coded radio is fitted. If this is the case obtain the anti-theft coding.
• ‒ Remove battery.
• ‒ → Connect test box V.A.G 1598/31 to control unit wiring harness. The engine control unit remains disconnected.

• ‒ → Check wiring for open circuit between test box and 6-pin connector using current flow diagram.
      Contact 2 and test box socket 98
      Contact 4 and test box socket 108
      Contact 6 and test box socket 100
      Wire resistance: max. 1.5 ω
• ‒ Additionally check wiring for short to one another, and for short to positive or earth.

If the specification is obtained:

• ‒ Connect test box V.A.G 1598/31 to engine control unit as well and reconnect 6-pin connector to EGR valve.
• ‒ Install battery.
• ‒ Connect the fault reader V.A.G 1551 (V.A.G 1552). Then switch ignition on and select engine control unit with the "Address word" 01.

=> Repair group 01; General to self-diagnosis: Connecting fault reader

• ‒ Initiate final control diagnosis and select EGR valve (N18):

=> Repair group 01; Final control diagnosis; Performing final control diagnosis

• ‒ Connect diode test lamp V.A.G 1527 B to socket 100 of test box and earth using adapters from V.A.G 1594.
      The LED must flash.
• ‒ Proceed with final control diagnosis until completed.
• ‒ Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
• ‒ Switch off ignition.

• ‒ Depending on conditions, renew following components:

LED flashes:

• ‒ Renew EGR valve (N18) with potentiometer (G212).
• ‒ Re-adapt engine control unit:

=> Repair group 24; Engine control unit; Adapting engine control unit to throttle valve control part and EGR valve

If no wiring fault is detected and the LED does not flash:

• ‒ Renew engine control unit:

=> Repair group 24; Engine control unit; Renewing engine control unit