Display Group 044

Diagnostic conditions for three way catalytic converter diagnosis, bank 1 and bank 2

NOTE:
- When the diagnostic conditions are fulfilled (display fields 3 and 4) by using the heated oxygen sensors in front of and behind the three way catalytic converter at each start the Engine Control Module (ECM) carries out a diagnosis of the three way catalytic converter: During this diagnosis, the deterioration rate of the three way catalytic converter is determined. The deterioration rate of the three way catalytic converter is displayed when display groups 035 and 036 are displayed. However, this diagnosis is "cross-blocked." That means that before the three way catalytic converter diagnosis can be evaluated, a result of the heated oxygen sensor diagnosis must be available to the Engine Control Module (ECM).
- If a malfunction is stored in DTC memory that affects the heated oxygen sensors in front of or behind the three way catalytic converter the heated oxygen sensor diagnosis can not be carried out and the three way catalytic converter diagnosis can not be evaluated,
- If in display group 029, display field 1 the value of the three way catalytic converter diagnosis is not set to "0" during regeneration of the readiness code, and/or a malfunction is stored in DTC memory that affects the three way catalytic converter display group 044 can be used to selectively call the diagnostic conditions (display fields 3 and 4).
- If in display group 029, display field 1 the value of the three way catalytic converter diagnosis and the value of the heated oxygen sensor diagnosis are not set to "0" during regeneration of the readiness code, display group 044, display field 1 can be used to determine whether the three way catalytic converter diagnosis has been carried out inside the ECM control module, but the value of the three way catalytic converter diagnosis under display group 029, display field 1 can not be set to "0" because the heated oxygen sensor diagnosis has not been carried out.

- The diagnostic conditions are only achieved 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. However the diagnostic conditions are only displayed 4 minutes after engine start, because until that time diagnosis is prohibited. If the diagnostic conditions are fulfilled, diagnosis is active. Now, obtaining a diagnostic result requires a test drive of approx. 1-1/2 to 5 min under the diagnostic conditions.
- If a malfunction is stored in DTC memory that affects diagnostic conditions 1 and 2, the diagnostic conditions can not be obtained. In this case repair the malfunction. If a malfunction is stored that involves the heated oxygen sensors in front of three way catalytic converter the diagnostic conditions can be achieved, but the diagnosis result can not be OK.
- If the effect of the three way catalytic converter is recognized as OK during the first diagnosis, the diagnosis is discontinued. If the effect (conversion) is recognized as not OK, the three way catalytic converter diagnosis is continued. If the diagnosis will be repeated selectively and/or repeated after an OK diagnosis, stop the engine and Start again.





Notes on display field 7: Display field 1 shows which diagnosis has been carried out or has not been carried out yet. If the three way catalytic converter diagnosis is carried out inside the ECM, but the heated oxygen sensor diagnosis has not been carried out yet, the three way catalytic converter diagnosis is not evaluated and therefore the deterioration rate is not set in display groups 035 and 036.

- Value "0" = Diagnosis carried out
- Value "1" = Diagnosis not carried out









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