Volkswagen Workshop Service and Repair Manuals

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required

• ◆ Hand multimeter V.A.G 1526 or multimeter V.A.G 1715
• ◆ Fault reader V.A.G 1551 (or vehicle system tester V.A.G 1552) with cable V.A.G 1551/3
• ◆ Adapter set V.A.G 1594
• ◆ Test box V.A.G 1598/31
• ◆ Current flow diagram

Check conditions

• ● → Fuses 24, 31 and 36 must be OK.
• ● The battery voltage must be at least 11.5 V.

Test sequence

• ‒ 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.
  (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 66" and confirm with Q key.

• ‒ Observe values displayed in display zone 2 (2nd digit from left = clutch pedal switch).
       Specification: x 0 x x
• ‒ Depress clutch pedal fully and observe values in display zone 2.
       Specification: x 1 x 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:

• ‒ Remove cover in footwell (driver's side).

• ‒ Pull 2-pin connector off clutch pedal switch.
• ‒ → Measure resistance at switch contacts.
       Specification
       Clutch not depressed: max. 1.5 ω
       Clutch depressed: ∞ω(open circuit)

If the specifications are not obtained:

• ‒ Replace clutch pedal switch (F36).
• ‒ Interrogate fault memory, if necessary, repair any faults and then erase fault memory => Page 01-20 , interrogating and erasing fault memory.

If the specifications are obtained:

• ‒ → Connect multimeter to measure voltage with aux. cables from V.A.G 1594 to contact 1 (positive) of clutch pedal connector and earth.
• ‒ Switch on ignition.
       Specification: min. 11.5 V

If the specification is not attained:

• ‒ Check wire for open circuit between 2-pin connector contact 1 and fuse holder referring to current flow diagram.
       Wire resistance: max. 1.5 ω

If the specification is obtained:

• ‒ → Connect test box V.A.G 1598/31 to control unit wiring harness. The engine control unit remains disconnected.

• ‒ → Check wire between test box and 2-pin connector referring to current flow diagram.
       Contact 2 and test box socket 65
       Wire resistance: max. 1.5 ω
• ‒ Additionally check wires for short to one another, to vehicle earth and to battery positive.
       Specification: ∞ω

If no fault is detected in the wiring:

• ‒ Replace engine control unit
  => Page 24-121 .