Volkswagen Workshop Service and Repair Manuals

Checking function

Functional check , Final control diagnosis

Checking activation

Special tools, testers and auxiliary items

• ◆ Hand multimeter V.A.G 1526 or multimeter V.A.G 1715
• ◆ Diode test lamp V.A.G 1527
• ◆ Test box V.A.G 1598/18
• ◆ Adapter set V.A.G 1594
• ◆ Current flow diagram

Test conditions

• ● Fault reader V.A.G 1551 (V.A.G 1552) connected
• ● Ignition switched off

Test sequence

• ‒ Remove air cleaner.

• ‒ → Pull plug -1- off throttle valve positioner (V60) -2- .
• ‒ Connect diode test lamp V.A.G 1527 with aux. cables from V.A.G 1594 to contacts 1+6 of the connector.
• ‒ Bridge contacts 4+5 with aux. cables from V.A.G 1594.
• ‒ Switch on ignition and again perform self-diagnosis until the throttle valve positioner is activated.
       LED must light up.
• ‒ Slowly open throttle valve slightly. The display must
       briefly change to the other LED
  and then
       go out.

Note:

If the check has to be repeated separate aux. cables on contacts 4+5 and then reconnect.

• ‒ Carry out final control diagnosis up to end.
• ‒ Switch off ignition and connect plug.
• ‒ Interrogate fault memory=> Page 01-6 .

If the LEDs do not light up:

• ‒ Switch off ignition

• ‒ → Connect test box V.A.G 1598/18 to control unit wiring loom.
• ‒ Check wiring between test box and 6 pin connector for open circuit according to current flow diagram.
       Contact 1+socket 26
       Contact 2+socket 16
       Contact 3+socket 23
       Contact 4+socket 20
       Contact 5+socket 10
       Contact 6+socket 2
       Wire resistance: Max. 1.5 ω
• ‒ Check wiring at 6 pin connector for short to one another.
       Specification: ∞ω

Checking resistance

Test conditions

• ● Ignition switched off.

Test sequence

• ‒ Remove air cleaner.
• ‒ → Pull connector -1- off throttle valve positioner -2-.
• ‒ Check resistance with hand multimeter V.A.G 1526 and aux. cables from V.A.G 1594 at contacts of throttle valve positioner as follows:
       Specifications:
       between contacts 1+6 = 3...200 ω
       between contacts 4+5
       Throttle valve closed = max. 200 ω
       Throttle valve open =∞ ω

If the specifications between contacts 4+5 are not attained:

• ‒ Check idling switch => Page 24-37 .