Multec - S (C 16 XE) F0: DATA LIST
| No. | TECH 1 Display | Conditions for Checking | Nominal Value | Trouble Codes | Terminal |
|---|---|---|---|---|---|
| 11 | O2 INTEGRATOR | Ignition ON | |||
| 128 steps | 13,44,45 | - | |||
| Engine running at idle speed, at operating temperature | 115 to 140 steps | ||||
| Trouble - shooting: | Nominal Value: | Cause of Fault: |
(If nominal value is not attained)
By means of the integrator, the air / fuel mixture correction of the oxygen sensor control can be evaluated.
If (e. g. ) the air / fuel mixture is too lean, the integrator value and thus the injection period is increased until the oxygen sensor signals a mixture that is too rich. The integrator value is then reduced and thus the injection period decreased until the oxygen sensor indicates a mixture that is too lean (closed loop).
Integrator = 128 means either: stochiometric air / fuel ratio approx. 14.7 kg air to 1 kg fuel, i. e. for each molecule of fuel there is one molecule of air available for combustion
or: the closed loop is opened by the control unit because a fault is present or the conditions for the closed loop are not yet satisfied
Note: With a closed loop and faultless operation of the system, the integrator fluctuates constantly around the value 128, e. g. from 120 to 135
Integrator less than 128 means: air / fuel mixture too rich, injection period is decreased
Integrator greater than 128 means: air / fuel mixture too lean, injection period is increased
· To be able to evaluate a change in the integrator, the value of the O2 block learn method cell 1 (at idle speed) or O2 block learn method cell 2 (at partial load) must be evaluated as well.
· Erase trouble code
· Integrator greater than 160 and O2 block learn method
cell less than 128 then: wait until the system stabilizes itself (a few minutes).
· Integrator greater than 160 and O2 block learn method
cell greater than 150 then: test step 10 part 3: mixture constantly too lean (oxygen sensor voltage less than 300 mV)
· Integrator less than 1 00 and 02 block learn method
cell greater than 128 then: wait until the system stabilizes itself (a few minutes).
· Integrator less than 100 and 02 block learn method
cell less than 106 then: test step 10 part 2: mixture constantly too rich (oxygen sensor voltage greater than 600 mV)