On-Board Diagnostics

Type of diagnosis: 

• Once per driving cycle. Interrupted when fault criteria fulfilled or OK reported. Restarts 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.
• Accepted transition diagnosis of oxygen sensor 1. Purge active. Idling. Max. one change in status of brake light switch. Purge adaptation higher than -7%. Car stationary for 8 s.

  The diagnosis will start once the above conditions have been fulfilled. If the diagnosis is interrupted then the speed must exceed 0 on one occasion before it is allowed to restart.

Fault criteria 

• Tank pressure pulsating at a frequency higher than 5.6 Hz with an amplitude exceeding 0.020 kPa.

Generating diagnostic trouble codes 

• Diagnostic Trouble Codes are generated if the fault criteria are fulfilled and the dependants are OK.

Dependents 

• P0444 , P0445 , P0501 , P0502 , P0506 , P0507 , P1444 , P1445 , P1576  and P1577 .

System reaction to a fault 

• Integrity diagnosis of purge system blocked.

OK report 

• Diagnoses for P1451 , P1452  and P1453  performed once and fault criteria not fulfilled. Fault criteria for P0452  or P0453  not fulfilled.

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

• Type III.