Volkswagen Workshop Service and Repair Manuals

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 1551/3
• ◆ → V.A.G 1788/10 Engine speed adjuster

Test conditions

• ● 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.

• ‒ Set an engine speed of 2200...2800 rpm with speed regulator V.A.G 1788/10:

• ‒ Maintain the engine speed at 2200...2800 rpm until the display
       in display zone 4 jumps from "Test OFF" to "Test ON". The catalyst temperature
       in display zone 2 must be min. 352 °C.
• ‒ Check time period in display zone 3:
       Specification: max. 2.2 seconds
• ‒ Continue to maintain the speed at 2200...2800 rpm until the specification "B1-P1 OK" appears in display zone 4.

If the specifications are obtained:

• ‒ Press ⇒key.
• ‒ Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.
• ‒ Switch off ignition.

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 24-22 .

If the specifications are again not attained:

• ‒ Replace Lambda probe (G39).