On-Board Diagnostics

Type of diagnosis: 

• Continuous. But interrupted when fault criteria fulfilled and will not restart until next driving cycle.

Enable criteria: 

• General condition for this diagnostic trouble code: Atmospheric pressure must exceed 72 kPa as well as coolant and intake air temperature must exceed -7°C.
• Test 1: Engine running. Main relay voltage exceeding 10V. Pre-heating not active.
• Test 2: Engine running. Main relay voltage exceeding 10V. Pre-heating active.

Fault criteria: 

• Test 1: Output voltage below 2V for more than 5 s.
• Test 2: Current below 300 mA for more than 5 s.

Dependents: 

• P1641 , P1654  and P1655 .

System reaction to a fault: 

• Oxygen sensor affect on closed loop zeroed.

OK report: 

• Enable criteria fulfilled. Fault criteria for P1141  or P1142  not fulfilled within 60 s.

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

• Type III.