Display Group 034

Display group 034 [Number of flank rise and flank fall tests Notes on display group 032, 033 and 034:

- If the value of the heated 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 the DTC memory that relates to the heated oxygen sensors, display groups 032, 033 and 034, as well as display groups 042 and 043 are used to carry out a selective diagnosis.
- The Engine Control Module (ECM) checks the flank rise and/or flank fall time (response time) of the voltage signal for the heated oxygen sensors in front of three way catalytic converter after every start with diagnostic conditions fulfilled display group 042.
- The display values for display group 034 are incremented with each diagnosis that is carried out, whether the diagnosis is recognized as OK or not OK. If the flank rise and/or flank fall time is recognized as OK during the first diagnosis, the display values are increased by the value "1" and the diagnosis is discontinued. If the limit values (flank rise time 90 ms/flank fall time 100 ms) are exceeded, the diagnosis is recognized as not OK. The flank rise and/or fall times now continue to be checked, whereby the display values are incremented with each additional diagnosis. However, the limit values can also be exceeded because combustion misfiring is recognized. In this case, the malfunction "Bank X probe Y signal too slow" is not stored in DTC memory, but"Cyl. x Combustion misfiring recognized" is stored.
- Display groups 032 and 033 show the highest and lowest flank rise and/or flank fall time for all tests carried out (number of tests display group 034).
- If during one of the next tests, a higher or lower diagnosis time is recognized, the current value is overwritten. With diagnostic conditions fulfilled, display group 043 shows the current flank rise and flank fall times. After diagnosis is ended, the diagnosis times shown are those that were recognized at the last diagnosis that was carried out.
- The display values are only reset by erasing the DTC memory. Selective observation times can be defined by resetting the display values.