Volkswagen Workshop Service and Repair Manuals

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
• ◆ Test box V.A.G 1598/22
• ◆ Hand multimeter V.A.G 1526 or multimeter V.A.G 1715
• ◆ Adapter set V.A.G 1594
• ◆ Current flow diagram

Test sequence

• ‒ 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 .)

• ‒ Press keys 0 and 8 for the function "Read measured value block" and confirm entry with Q key.

• ‒ Press keys 0, 6 and 6 for "Display group number 66" and confirm entry with Q key.

• ‒ Observe display in display zone 2:
  (3rd and 4th positions from left)
       Specification: x x 0 0
• ‒ Depress brake pedal fully and observe display in display zone 2.
       Specification: x x 1 1
• ‒ Press the ⇒key.
• ‒ Press keys 0 and 6 for the "End output" function and confirm input with the Q key.
• ‒ Switch off ignition.

If the specification is not obtained:

• ‒ → Connect test box V.A.G 1598/22 to control unit wiring harness.
• ‒ Check wiring between test box and 4 pin connector for open circuit using current flow diagram.
       Contact 3+socket 38
       Contact 4+socket 37
       Wire resistance: Max. 1.5 ω

If the specification is obtained:

• ‒ Check wiring between 4 pin connector contacts 1 + 2 and fuses 13 + 34 using current flow diagram.

=> Current flow diagrams, Electrical fault finding and Fitting locations binder