Volkswagen Workshop Service and Repair Manuals

Special tools, testers and auxiliary items

• ◆ Fault reader V.A.G 1551 or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3
• ◆ Hand multimeter V.A.G 1526 or multimeter V.A.G 1715
• ◆ Adapter set V.A.G 1594
• ◆ Current flow diagram

Test conditions

• ● Speedometer OK., checking:

=> Repair group 90, Electrical system

Note:

To check the speed signal the vehicle must be driven. To do this a second person is necessary.

Test sequence

• ‒ Connect fault reader V.A.G 1551 (V.A.G 1552) and select engine electronics control unit with the "Address word" 01. When doing this the engine must be running at idling speed.
  (Connecting fault reader and selecting engine electronics control unit .)

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

• ‒ Press keys 0 and 1 for "Display group number 01" and confirm entry with Q key.

• ‒ Carry out test drive and when doing this observe display (2nd person necessary).
• ‒ Observe displayed figure in display zone 3:
       Specification: approx. driven speed
• ‒ Press ⇒key.
• ‒ Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.

If no speed is indicated:

• ‒ → Detach 3 pin connector from sender -1-.
• ‒ Switch ignition on.

• ‒ → Check voltage between contacts 1+3 of detached connector.
       Specification: Min. 9 V
• ‒ Switch off ignition.
• ‒ Reconnect connector

If no voltage was present:

• ‒ Check wiring according to current flow diagram.

If the specification is attained:

• ‒ → Connect test box V.A.G 1598/18 to control unit wiring loom.
• ‒ Connect multimeter to measure voltage at sockets 1+11.
• ‒ Switch ignition on.
• ‒ Raise left front wheel or push vehicle. The voltage figure must fluctuate between
       0...at least 4 V.

If no wiring fault is detected and voltage was present between contacts 1+3:

• ‒ Renew Simos control unit (J361)
  , item 4 .

If the specification is not obtained:

• ‒ Check for wiring open circuit according to current flow diagram, if necessary replace speedometer sender (G22).