Volkswagen Workshop Service and Repair Manuals

Special tools, testers and auxiliary items

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

Test conditions

• ● Electrical consumers switched off (radiator fan must not run during the check)
• ● Air conditioner switched off
• ● Engine oil temperature at least 80 °C

Test sequence

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

• ‒ Press keys 0 and 8 for the function "Read measured value block" and confirm entry with Q key.

• ‒ Press keys 0, 1 and 0 for "Display group number 10" and confirm entry with Q key.

• ‒ Check the measured values for ignition timing control (display zones 1...4):

Continuation

• ‒ Check operating conditions => Page 24-63
• ‒ Check throttle valve control part
  => Page 24-71
• ‒ Check knock sensor and knock control
  => Page 28-22

If the specification is again not attained:

• ‒ Renew Motronic control unit (J220)
  => Page 24-8 , item 12 .
• ‒ Read-out the readiness code=> Page 01-35 .