Display Group 000 - 008

Display group overview with test table


NOTE: Display groups 000 to 010 are used for general troubleshooting.

Display Group 000 - 004:

Display Group 005 - 010:

NOTE: Display groups 11 to 45 are used for troubleshooting when there are driving performance problems, and used to evaluate components and systems that influence the exhaust.

Display Group 011 - 015:

Display Group 016 - 025:

Display Group 026 - 037:

Display Group 038 - 045:

NOTE: Display group 99 can switch the Oxygen sensor control on or off.

Display Group 099:

Display Group 000


NOTE: If the values displayed do not correspond to the specified values, the following display groups 001 to 010 can be used to repair malfunctions.

Display Field 1 - 8:

Display Field 9 - 10:

NOTE ON DISPLAY FIELD 8:
Deviations in display field 8 should only be considered after the oxygen sensor learning process at idle has been completed See display field 9.


NOTE ON DISPLAY FIELD 9:
If specified display values are greater than 3, display groups 007 and/or 008.


Display Group 001







NOTE ON DISPLAY FIELD 3:
The altitude display is a calculated value inside the engine control module that is calculated by a comparison of the intake air mass and the throttle angle.


Test Table Display Group 001












NOTE ON DISPLAY FIELD 1:
- The Engine Coolant Temperature (ECT) sensor is a temperature-dependent resistor. If the sensor signal is falsified by e.g. dampness in the harness connection (effect as with resistors connected in parallel), this falsification can lie in a range that is not recognized by the DTC memory.
- If a malfunction relating to the Engine Coolant Temperature (ECT) sensor is stored, a coolant temperature of 20 °C(68 °F) is displayed in the measuring block at engine start. 10 °C(50 °F) is added to this for each minute of engine operation. The maximum replacement value is 85 °C(185 °F).


Display Group 002







Test Table Display Group 002












NOTE ON DISPLAY FIELD 3:
- The mechanical Closed Throttle Position (CTP) switch must be closed for the testing on the Throttle position sensor learning values See display field 4
- If the displays in display fields 2 and 3 match at idle, the learning process is OK. If no learning process takes place, the last value learned will be displayed continuously.
- If engine control module is without power, the throttle position sensor learning value will be set to 0.550 V


Display Group 003







NOTE ON DISPLAY FIELD 1:
Idle speed on vehicles without A/C and rear windshield heater switched on: 750 - 850 RPM.


NOTE ON DISPLAY FIELD 3:
For the testing at wide open throttle, stop engine, and switch ignition on.
Since in vehicles with manual transmission and automatic transmission different throttle bodies are installed, the start of opening of the throttle body can be measured with ignition on and thus incorrect installation can be checked
- Manual transmission: 45-53%
- Automatic transmission: 27-35%

Test Table Display Group 003

Display Field 1 - 2:

Display Field 3 - 4:

Display Group 004







NOTE:
- Values in display fields 2 and/or 3 can only be evaluated with idle air control valve is within tolerance at idle (display value 1). If the idle air control valve is not within tolerance after 1 minute waiting time, no learning takes place in display fields 2 and/or 3.
- Positive learning values show a greater learning value than in the basic setting: -N71- is further open.
- Negative learning values show a learning value that is less than in basic setting: -N71- is more closed.


Test Table Display Group 004

Display Field 1:

Display Field 2 - 3:

Display Field 4:

NOTE: Display field 4 (shift inputs) can be used to recognize whether the components described below are recognized by the Engine Control Module (ECM) as switched on or off. Display group 023 gives an exact description of the shift inputs.







Display Group 005







Display Group 006







NOTE:
- Positive learning value (+ %): Mixture too lean, more fuel must be injected. (Programmed basic fuel injection time too short, actual fuel injection time -% longer so that Lambda=1 is obtained).
- Negative learning value (%): Mixture too rich, less fuel must be injected. (Programmed basic fuel injection time too long, actual fuel injection time-% shorter so that Lambda=1 is achieved).


Test table display group 005 and/or display group 006












NOTE ON DISPLAY GROUPS 005 AND 006:
If there are differences in oxygen sensor learning values (See display group 010, display fields 1 and 2) of more than 8% between display group 005 (bank 1) and display group 006 (bank 2), the following malfunctions are possible:
- Spark plugs faulty
- Fuel injectors faulty (leaking, plugged)
- Intake air leak on one side
- Heated Oxygen Sensor (HO2S) faulty, dirty
- Mechanical engine basic settings (valve/camshaft timing) not OK
If a difference of 9% is reached between the richest and leanest oxygen sensor learning value of one display group, further learning will be discontinued in the two affected learning ranges (See display group 007 and/or 008). Learning requirements display (See display groups 007 and/or 008) of these learning ranges cannot be 1.
If there is no power to the engine control module, all values are set back to 0.0%.

Display Group 007

Display Group 007:

Display Group 008







Test table display group 007 and/or display group 008

Display Field 1 - 4:

NOTE ON DISPLAY FIELD 1:
- Oxygen sensor control can basically be evaluated both in "Basic Setting" function 04 as well as in "Read Measuring Value Block" function 08 only after successful learning (See learning requirement display).
- Oxygen sensor control shows momentary control status. After successful learning, (See 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 See 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 airleaks
- Engine damage (oil burning with faulty piston)


NOTE 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







NOTE 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).







NOTE 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 See 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.