On-Board Diagnostics

Type of diagnosis: 

• Tests 1 and 2: Continuous. But interrupted when fault criteria fulfilled and does not restart until next driving cycle.

Enable criteria: 

• Test 1: Engine running.
• Test 2: Engine running. Speed 50-205 km/h for longer than 10 s. Brake pedal not depressed.

Fault criteria: 

• Test 1: Speed exceeding 270 km/h.
• Test 2: Speed rises more than 120 km/h or drops more than 50 km/h within 1 s.

Dependents: 

• None.

System reaction to a fault: 

• The cruise control is blocked. Vehicle speed (Bus from MIU.) is used as a substitute value. The idling speed adaptation is blocked and reset.

OK report: 

• 60 s has expired since start. Vehicle speed has exceeded 0 on some occasion.

Fault handling:  (For more information, see FAULT HANDLING III, OTHER EMISSION-RELATED COMPONENTS AND FUNCTION ).

• Type III.