Work procedure

• Connect diagnostic tester. See Connect diagnostic tester  .
• Start engine and let run at idle for at least 15 minutes.
• In diagnostic function "33 - OBD", select "Mode 6: Check test results of components that are not continuously monitored".
• Select the "Test-ID 05: Tank ventilation system".
• Check specified values at idle.
  TANK VENTILATION SYSTEM SPECIFICATION
  
  

  Tank ventilation system	Specification (1)
  Deviation of oxygen sensor control in direction "lean"	min: 9830.000
  Deviation of oxygen sensor control in direction "rich"	min: 695,000
  (1) Control module internal calculated value

• End diagnosis and switch ignition off.

If the specified values are not reached:

• EVAP canister system, checking for proper seal. See EVAP CANISTER SYSTEM, CHECKING FOR PROPER SEAL .
• Check Leak Detection Pump (LDP) -V144-. See LEAK DETECTION PUMP (LDP) -V144-, CHECKING .