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Display Group 042









Diagnostic conditions for diagnosis of the flank rise and/or flank fall time (response time) of the voltage signal of heated oxygen sensors in front of three way catalytic converters

NOTE:
- If the value of the oxygen sensor diagnosis is not set to "0 in display group 029, display field 1 during regeneration of the readiness code and/or there is a malfunction in DTC memory that relates to the oxygen sensor, display group 042 can be used to set up the diagnostic conditions (display fields 3 and 4) and the diagnostic result (display field 2) can be read.
- If the diagnostic conditions are fulfilled, the Engine Control Module (ECM) checks the flank rise and/or flank fall time (response time) of the voltage signal of the heated oxygen sensors in front of the three way catalytic converters at each start, which is displayed each time display groups 032, 033, 034 and 43 are displayed.
- The diagnostic conditions are only fulfilled during a trip of approx. 1-1/2 to 5 minutes at 80-100 km/h (50-63 mph) with manual transmission in 4th or 5th gear, or automatic transmission selector lever in "D" position, preferably in 4th gear. If the diagnostic conditions are fulfilled, diagnosis is active. In order to get a diagnosis result, you have to drive approx. 1-1/2 to 5 minutes under diagnostic conditions.
- If a malfunction is stored in DTC memory which affects diagnostic conditions 1 and 2, the diagnostic conditions can not be achieved. In this case repair the malfunction.
- If a malfunction is stored that involves the heated oxygen sensors in front of three way catalytic converters, the diagnostic conditions can be achieved, but the diagnosis result can not be OK.
- If the flank rise and flank fall time is recognized as OK during the first diagnosis, the diagnosis is discontinued. If the times are recognized as not OK, the diagnosis of the flank rise and/or flank fall time is continued. If the diagnosis will be repeated selectively or after an OK diagnosis, switch engine off and restart.





Note on display field 2: If after diagnosis all 8 displays are "1" and the engine is stopped and started again, display values 1 and 2 are reset to "0" and values 3 to 8 remain at "1". If during the trip diagnostic conditions (display fields 3 and 4) are achieved, display values 1 and 2 are set to "1" (diagnosis active) and display values 3 to 8 are set to "0".

Value "0": Diagnosis not active and/or diagnosis not finished and/or diagnosis result not OK
- Value "1": Diagnosis active and/or diagnosis finished (whether OK or not OK) and/or diagnosis result OK

Notes on display field 3 and 4:
- Value "0" = Diagnosis condition not fulfilled
- Value "1" = Diagnosis condition fulfilled




Re: display positions 5 and 6: With a lot of fuel vapor on the EVAP system diagnosis, use function 04 to carry out "Basic Setting" (EVAP system automatically shut off during function 04).
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