Volkswagen Workshop Service and Repair Manuals

Only engines which conform to EU 4 standard (engine code AKP, AUC, AUD)

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

• ◆ Fault reader V.A.G 1551 or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3A

Test conditions

• ● → Fuse No. 1 must be OK.
• ● Exhaust system between catalyst and cylinder head must be free of leaks
• ● Coolant temperature must be at least 80 °C, =>display group 04, display zone 3.

Functional check

• ‒ Connect fault reader V.A.G 1551 (V.A.G 1552). Start engine and select "Address word" 01 of engine control unit. When doing this the engine must be running at idling speed.
  (Connecting fault reader and selecting engine control unit .)

• ‒ Press keys 0 and 4 for the function "Introduction of basic setting" and confirm entry with Q key.

• ‒ Press keys 0, 3 and 4 for "Display group number 34" and confirm entry with Q key.

• ‒ Depress brake pedal.

• The engine speed is increased by the control unit to
       approx. 1100...1300 rpm.

• ‒ Maintain the engine speed until the display
       in display zone 4 jumps from "Test OFF" to "Test ON". The catalyst temperature in
       display zone 2 must be min. 400 °C.

Note:

This process can take a few minutes.

• ‒ Check amplitude duration in display zone 3:
       Specification: 0.7... 2.00
• ‒ Continue to maintain engine speed until the specification "B1-P1" appears in
       display zone 4.
• ‒ Press ⇒key.
• ‒ Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.

If the specifications are not attained:

• ‒ Carry out a road test to free Lambda probe of possible residues and repeat the test.

Observe the valid safety precautions when carrying out a road test => Page 24-29 .

If the specifications are again not attained:

• ‒ Renew Lambda probe before catalyst (G39)
  , item 21 .