Volkswagen Workshop Service and Repair Manuals

Special tools, testers and auxiliary items

• ◆ Oil pressure tester V.A.G 1342.
• ◆ Diode test V.A.G 1527.
• ◆ Adapter set V.A.G 1594.

Note:

Functional check and servicing the optical and acoustic oil pressure warning:

=> Current flow diagrams, Electrical fault finding and Fitting locations

Test sequence

• ‒ → Remove 0.25 bar oil pressure switch (blue insulation) or 0.30 bar oil pressure switch (brown insulation) and screw into the tester.
• ‒ Screw tester into the cylinder head or oil filter bracket in place of the oil pressure switch.
• ‒ Connect brown wire -3- of tester to earth (-).

• ‒ → Connect the diode test lamp V.A.G 1527 with aux. cables from V.A.G 1594 to battery positive (+) and 0.25 bar or 0.30 bar oil pressure switch (F22) -A- LED must light up.
• ‒ Start engine and increase speed slowly.
  At
      0.15...0.35 bar (blue switch)
      0.15...0.45 bar (brown switch)

• the LED must go out, otherwise renew oil pressure switch.

• ‒ Connect the diode test lamp to 1.8 bar (white insulation) -B-.
  At
      1.6...2.0 bar

• the LED must go out, otherwise renew oil pressure switch.

• ‒ Increase engine speed further.
  At
      2000 rpm and an oil temperature of 80° C the oil pressure should be at least 2.0 bar.
• ‒ At higher engine speed the oil pressure must not exceed 7.0 bar
  If necessary renew oil pump cover with pressure relief valve.