SEAT 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:

=> Electrical system; Repair group 90

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 with the "Address word" 01 select the engine electronics control unit. When doing this the engine should be idling.
  (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 4 for "Display group number 04" and confirm entry with Q key.

• ‒ Carry out test drive, when doing this observe displayed value in display zone 3 (2nd person required).
      Specification: approx. driven speed

• ‒ Press the ⇒key.
• ‒ Press keys 0 and 6 for the "End data transfer" function and confirm input with the Q key.

If no speed is indicated:

• ‒ → Pull 3 pin connector off road speed sender -1-.
• ‒ Switch on ignition.

• ‒ → Measure voltage between connector contacts 1+3.
      Specification: approx. 9 V
• ‒ Switch off ignition.
• ‒ Reconnect connector.

If no voltage was present:

• ‒ Check wiring connections according to current flow diagram.

If the specification is attained:

• ‒ Remove dash panel insert.

=> Electrical system; Repair group 90

• ‒ → Connect test box V.A.G 1598/18 to control unit wiring loom.
• ‒ Connect multimeter to test box sockets 1+11 to measure voltage.
• ‒ Switch on ignition.
• ‒ 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 14.

If the specification is not obtained:

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