Volkswagen Workshop Service and Repair Manuals

Note:

Only gold-plated contacts may be used when servicing the sender connector contacts

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

• ◆ Hand multimeter V.A.G 1526 or multimeter V.A.G 1715
• ◆ Adapter set V.A.G 1594
• ◆ Test box V.A.G 1598/31
• ◆ Current flow diagram

Test sequence

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

• ‒ → Pull 4-pin connector off intake manifold pressure sender (G71) and intake air temperature sender (G42) -arrow-.

• ‒ → Check wiring for open circuit between test box and 4-pin connector referring to current flow diagram:
       Contact 3 and test box socket 96
       Contact 4 and test box socket 95
       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:

• ‒ Remove air cleaner , Fig. 2 .
• ‒ Renew the intake manifold pressure sender (G71) with intake air temperature sender (G42)
  => Page 24-17 , item 2 .
• ‒ Interrogate fault memory, if necessary, repair any faults and then erase fault memory => Page 01-20 , interrogating and erasing fault memory.
• ‒ Erase the learnt values and adapt the engine control unit again=> Page 24-128 .