Display Groups 007 & 008

Display group 007




Display group 008

1) Evaluate tolerance range of the oxygen sensor control only at idle during "Basic Setting" function 04, since the EVAP canister can also be controlled during "Read Measuring Value Block" function 08.





Test table display group 007 and/or display group 008

Notes on display field 1:
- Oxygen sensor control can basically be evaluated both in "Basic Setting" function O4 as well as in "Read Measuring Value Block" function O8 only after successful learning (learning requirement display).
- Oxygen sensor control shows momentary control status. After successful learning, (learning requirement display), values vary around 0.0 +/- 6.0% If the learning process (display field 4) is ended and no value around 0.0 +/- 6.0% is obtained, observe display group 010, display fields 3 and/or 4 and check control behavior of the two heated oxygen sensors. During this process, the display values must at times drop below 0.3 V and exceed 0.6 V otherwise check oxygen sensor heating and the heated oxygen sensor.
- The oxygen sensor control stop evaluation is also done by the diagnosis only after successful learning - learning requirement display:

- Control stop max.: + 32%
- Control stop min.: -87.5%

With values of more than + 20% in "Basic Setting" function 04, the following malfunctions are possible:

- Intake air leaks
- Engine damage (oil burning with faulty piston)

Notes on display field 2: In display field 2 (learning range display), the momentary learning range (load status) is displayed. Only idle and partial throttle learning ranges are displayed since, at wide open throttle, no learning takes place.

In order to reach the corresponding learning range (load status):

- Idle: the vehicle should be allowed to run at idle (650-900 RPM)
- Partial throttle 1,2 or 3: during test drive (with second person), increase engine speed to 1500-3000 RPM and generate load by lightly operating the brake





- Display value "0" = Engine speed and/or engine speed and load for this learning range not obtained.
- Display value "1" = Engine speed and/or engine speed and load for this learning range obtained.

Notes on display field 3

- The oxygen sensor learning requirement diagnosis shows what oxygen sensor learning value was checked in the learning process.

- If diagnosis is successful, the corresponding value is set to "1", independently of whether the diagnosis was recognized as OK or not OK.
- If an "oxygen sensor learning requirement diagnosis" value is set to "1" in display field 3, but the corresponding value of the "oxygen sensor learning requirement display" is not set to "1" in display field 4, the diagnosis was carried out but not recognized as OK by the Engine Control Module (ECM). The "oxygen sensor learning requirement diagnosis" is now continued.
- The oxygen sensor learning requirement diagnosis is reset to "0" every time there is a start with a coolant temperature less than 40°C (104°F).





- Display value "0" = Diagnosis not carried out yet.
- Display value "1" = Diagnosis complete.





Notes on display field 4

Display field 4 (learning requirement display) shows the learning range (display field 2) for which learning is required.

Requirement for learning:
- No malfunction stored in DTC memory
- Engine speed at idle 650-900 RPM and/or 1500-3000 RPM
- Coolant temperature 80-110°C (176-230°F) (if learning does not start immediately after this requirement, step on the throttle).

Learning is prohibited:
- With uneven idle (hunting), during acceleration, at wide open throttle
- If malfunctions are stored in the DTC memory (not with sporadic malfunctions)
- If differences of 9% are obtained between the richest and leanest oxygen sensor learning value of one display group. If a 9% difference is obtained, continued learning of the learning range involved is discontinued. The learning requirement display of this learning range can not be 1 display groups 005 and/or 006.

Learning starts 20 sec. after initiation of "Basic Setting" function 04 and/or 2 to 4 min. after each start at a which the coolant temperature is less than 40°C (104°F).

The following listing shows when the request for new learning (learning requirement) is forced:
- During "Basic Setting" function 04 with VAG 1551 scan tool and/or each time the DTC memory is erased, all learning requirement displays are set to 0 in order to force new learning of the oxygen sensor learning values after the shop visit.
- At each start, coolant temperature less than 40°C (104°F), the learning requirement is forced in all learning ranges.
- If there is a large learning value deviation (from the stored learning value to the newly learned value) in the learning process, all learning requirement displays are reset to 0.

If there is successful learning, the learning requirement values of the respective learning ranges (display field 2) are set to 1.

- Display value "0" = Request for new learning.
- Display value "1" Learning process ended.