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 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, 1 and 9 for "Display group number 19" and confirm entry with Q key.

• ‒ Observe figure displayed in display zone 4:
       Specification: x x x x x x 0 x
• ‒ Turn the steering wheel to full lock and observe the display in display zone 4 (2nd position from right)
       Specification: x x x x x x 1 x
• ‒ 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 2 pin connector for open circuit using current flow diagram.
       Contact 1+socket 24
       Contact 2+socket 14
       Wire resistance: Max. 1.5 ω
• ‒ Additionally check wires all for short to one another.
       Specification: ∞ω

If no wiring fault is detected:

• ‒ Connect multimeter V.A.G 1526 to pressure switch contacts.
• ‒ Start the engine and run at idling speed. Check pressure switch for continuity.
       Specification: ∞ω
• ‒ Turn steering wheel to full lock.
       The pressure switch must switch to continuity.

If the specifications are not attained:

• ‒ Renew pressure switch for power assisted steering:

=> Running gear, axles, steering; Repair group 48; vane pump, reservoir, hydraulic pipes

If the specifications are not attained:

• ‒ Renew engine control unit => Page 24-104 .