Display Group 009 - 029
Display group overview with test table, Continued
Display Group 009
NOTE: The oxygen sensor control should always be evaluated only after successful learning( See learning requirement display , display group 007 and/or 008, display field 4) in both "Basic Setting" function 004 and "Read Measuring Value Block" function 08.
Test Table Display Group 009
NOTE ON DISPLAY FIELD 3:
- The evaporative emissions valve (EVAP canister valve) is closed during the learning process.
- The effect of the EVAP canister can be evaluated by comparing the display value during "Basic setting" (EVAP canister completely closed: 99%) and during "Read Measuring Value Block" (EVAP canister valve completely open: 0%).
- You can switch back and forth between "Basic Setting" function 04 and "Read Measuring Value Block" function 08 by pressing buttons -1- and -3- on VAG 1551 scan tool.
Display Group 010
NOTE: The total of the oxygen sensor control and oxygen sensor learning value shows the total effect of the oxygen sensor control. Bank differences can be evaluated directly by comparing display field 1 with display field 2.
Test Table Display Group 010
NOTE ON DISPLAY FIELD 4: The display value at times must drop below 0.3 V and exceed 0.6 V. Display values less than 0.40 V indicated rich condition.
HO2S voltage U Lambda (mV) vs. Lambda ( Lambda)
A - HO2S voltage (mV) high
Rich mixture (fuel excess or lack of air)
High CO value
B - Oxygen sensor probes voltage (mV) low
Lean mixture (lack of fuel or excess air)
Low CO value
Display Group 011
NOTE ON DISPLAY FIELD 1:
- At idle-Closed Throttle Position (CTP) switch closed-an ignition timing point of 12° BTDC is displayed.
- When the engine speed is increased-CTP switch open-the current ignition timing point is displayed without knock control and without digital idle speed control.
NOTE ON DISPLAY FIELD 2:
- Digital idle speed control is only active with Closed Throttle Position (CTP) switch closed.
- Knock control is active starting at an engine load greater than 40% See Display group 013 and/or 014.
NOTE ON DISPLAY FIELD 3:
- Digital idle speed control (ISC) is only active with the Closed Throttle Position (CTP) switch closed.
- Ignition timing point access to digital ISC with open CTP switch: 0.0° crankshaft.
- During "Basic Setting" function 04, digital ISC is blocked, display shows 0.0 ° crankshaft.
- Ignition timing point access to DLS during "Read Measuring Value Block" function 08 at idle without electrical consumers: 0.0 ± 3.0 crankshaft.
Display Group 012
NOTE ON DISPLAY FIELD 3:
The ignition timing point map switching is selected by knock control:
- First map = Ignition timing point-basic map (98 octane)
- Second map = Ignition timing point-map with reduced ignition angles (95 octane)
The ignition timing point difference between the first map and the second map is approx. 3° crankshaft. If an ignition timing point retarded by approx. ±4 crankshaft is recognized (display field 4), the second map is selected See Display groups 013 and 014 for more exact evaluation.
The second ignition timing point map is selected:
- If there is poor fuel quality (less than 95 RON)
- If there are abnormal engine noises (subassemblies loose)
- If there is engine damage (oil burning because of faulty piston)
If a knock sensor malfunction is recognized in DTC memory, ignition map switching is blocked.
NOTE ON DISPLAY FIELD 4:
- Knock control is active starting at an engine load greater than 40% See Display groups 013 and/or 014.
- The ignition timing point retarding values are only used when knock control is "active".
Display Group 013
Display Group 014
Display groups 013 and 014
NOTE ON DISPLAY FIELDS 2, 3 AND 4:
Knock control is active starting at an engine load greater than 40%. If the engine load exceeds 40%, the current ignition timing point retarding value is displayed; if the engine load drops below 40%, the last values used are displayed constantly.
If there is audible knocking without recognizable retarding of the ignition timing point, the engine speed should be increased over 3500 RPM for 5 seconds to initiate the knock sensor malfunction recognition (On Board Diagnostic).
If an ignition timing point retarding value of one cylinder deviates from the others, the following malfunctions are possible:
- Loose subassemblies
- Corrosion on the harness connector
- Engine damage (e.g. oil combustion with faulty piston)
If there are high ignition timing point retarding values on all cylinders of bank 1 or bank 2, the following malfunctions are possible:
- Corrosion on the harness connector See display groups 015 and 016
- Knock sensor tightening torque, 20 Nm (14 ft lb), not OK
- Open circuit See display groups 015 and 016
- Knock sensor faulty
- Loose subassemblies
If there are high ignition timing point retarding values on all six cylinders (banks 1 and 2), the car has been filled with fuel having low octane (less than 98 RON).
Display Group 015
Display Group 015
Display groups 015 and 016
NOTE ON DISPLAY FIELDS 2, 3 AND 4:
If there is a difference of more than a factor of 3 between the lowest and the highest knock sensor signal in one display group, the following malfunction is possible:
- Corrosion on the harness connector
If there are differences of more than 50% in knock sensor signal between display group 015 (cylinders 1 to 3) and display group 016 (cylinders 4 to 6), the following malfunctions are possible:
- Corrosion on the harness connector
- Open circuit
- Knock sensor faulty
If no malfunctions are found during the electrical testing of the knock sensor, the wiring and the connections, the engine should be checked for loose subassemblies or engine damage (e.g. oil burning due to faulty piston) See Display groups 013 and/or 014.
Display group 017
NOTE:
If in display group 029, display field 1, the value of the EGR system throughput diagnosis is not set to "0" during the regeneration of the "readiness code," and/or a malfunction relating to the exhaust system is stored in the DTC memory, display group 017 is used to carry out a selective diagnosis.
During cold start at idle, -10 °C to 30 °C (14 to 86 °F), and during "Basic Setting" function 04, no exhaust gas recirculation takes place. Since exhaust gas recirculation is switched off automatically during "Basic Setting" function 04, diagnosis of EGR throughput is evaluated only in "Read Measuring Value Block." function 08.
If diagnostic conditions are fulfilled, the Engine Control Module (ECM) checks the flow through the EGR system after each start. The diagnostic conditions are only reached during a trip at 80-100 km/h (50-63 mph) in 4th or 5 gear and/or with selector lever in the "D" position, preferably in 4th gear position. If the diagnostic conditions are fulfilled, the diagnosis is active. In order to get a diagnostic result, the vehicle must be driven approx. 1-1/2 to 5 minutes under the diagnostic conditions. However, the diagnosis is only considered OK when the EGR temperature (display field 4) is greater than 50 °C (122 °F) during the reading time (display field 2).
Diagnosis of the EGR flow (exhaust gas recirculation quantity) is active as soon as the following diagnostic conditions are fulfilled:
- Coolant temperature: greater than 8 °C (46 °F) (See display group 001)
- Vehicle speed: constant drive
- Engine speed: 2000 - 3000 RPM (See display group 003)
- Engine load: 30-60%
NOTE ON DISPLAY FIELDS 1 AND 2:
- In display fields 1 and 2, the timers are displayed. The final value of timer 2 is "48" or "160". The final values "48" and "160" are reading times ("48" = reading time 1; "160" = reading time 2).
- If the diagnostic conditions are fulfilled, the timers are incremented, outside the diagnostic conditions they are decremented.
- Counter 1 is incremented by "1" as soon as counter 2 reaches the value "255." If the value 255 is reached, counter 2 goes back to "0" and starts to increment again up to "48" (reading time 1).
- If reading time 1 has been reached, the Engine Control Module (ECM) -J192- checks the EGR temperature (display field 4). If the EGR temperature is greater than 50 °C (122 °F), the diagnosis is OK and the diagnostic program is discontinued. If the EGR temperature during reading time 1 is less than 50 °C (122 °F), counter 2 counts up to "160" (reading time 2).
- When reading time 2 is reached, the -J192- checks the EGR temperature (display field 4) again. If the EGR temperature is now greater than 50 °C (122 °F), the diagnosis is OK and the diagnostic program will be discontinued. If the EGR temperature is again less than 50 °C (122 °F), the EGR flow test is carried out again.
- If the EGR flow test is to be carried out selectively or after an OK diagnosis, stop the engine and start it again.
Display Group 018
NOTE ON DISPLAY FIELD 1:
The internal calculation value in the engine control module for the duty cycle is displayed without power and voltage correction.
NOTE ON DISPLAY FIELD 2:
The actual power draw by the Idle Air Control (IAC) valve -N71- is displayed.
NOTE ON DISPLAY FIELD 3:
- Positive values indicate increase in the duty cycle, in order to reach the specified current.
- Negative values indicate a decrease in the actual duty cycle to reach the specified current.
- If +60% is displayed for a longer time, this indicates contact resistance and/or an adjuster that is too hot.
- If -40% is displayed for a longer time, this indicates a winding short in the idle adjuster.
Display Group 019
NOTE ON DISPLAY FIELD 1:
The momentary engine power is a control module-internal calculated value that is calculated from the amount of air taken in under normal conditions (air pressure 1013 mbar. air temperature 20 °C or 68 °F).
Display groups 020 and 021
NOTE: Display groups 020 and 021 are only considered in vehicles with Secondary Air Injection (AIR) system.
Display Group 020:
Display Group 021:
Display group 022
Display Group 022:
NOTE: Display group 022 should only be considered on vehicles with traction control (ATC).
Vehicles with traction control (ATC) can be recognized by the ATC indicator light in the instrument cluster and/or ABS (ATC) On Board Diagnostic (OBD).
The wheel slip information for traction control (ATC) is calculated in the ABS control module. If slip is recognized, the ABS control module requests a reduction in torque from the Engine Control Module (ECM). This torque reduction is divided into 12 reducing stages.
With a cold engine, coolant temperature less than 20 °C (68 °F), the reduction of engine torque is obtained:
- With retarded ignition timing angle for lower reducing stages (1-5)
- By brief shut-off of individual fuel injectors for higher reducing stages (6-12)
If the engine is warm, coolant temperature greater than 40 °C (104 °F), the engine torque reduction is obtained only by briefly switching off individual fuel injectors.
Display Group 023
NOTE ON DISPLAY FIELD 1:
- The signal for upshift and downshift will only be output by the Transmission Control Module (TCM) for the automatic transmission 01 V. For vehicles without automatic transmission 01 V, a "1" is always displayed.
- Check upshift and downshift signal. Refer to "Upshift and Downshift Signals, Checking" Testing and Inspection
Note On Display Field 2:
Note On Display Field 3:
Note On Display Field 3:
NOTE ON DISPLAY FIELD 4:
- If the A/C compressor is off See display field 3; display field 4 can be used to recognize whether the compressor was switched off by the engine control module.
- Meaning of the 1-digit display:
Display groups 024, 025 and 026
NOTE:
- Display group 024 is currently not assigned.
- Display groups 025 and 026 are only used by Production.
Display Group 024:
Display Group 025:
Display Group 026:
Display Group 027
NOTE ON DISPLAY FIELD 1:
- On vehicles with manual transmission, "1" is always displayed.
- Checking Malfunction Indicator Lamp (MIL) wire from transmission control module, refer to "Transmission and Drivetrain/Transmission Control Systems/Malfunction Indicator Lamp - Transmission Control" Testing and Inspection
NOTE ON DISPLAY FIELD 2: Check fuel level signal from instrument cluster Testing and Inspection
Display group 028
NOTE: Display group 028 is only used by Production.
Display Group 028:
Display group 029 (Diagnosis status)
NOTE:
OBD II regulations require a display ("Readiness Code") that indicates readiness for inspection (annual exhaust emissions test). The readiness code display (display field 1) shows that every component and/or system that affects the exhaust, which can lead to switching on the MIL, has been operated at least once with positive result.
The readiness code is reset and/or erased:
- Every time the DTC memory is erased (both with address word 01 function 05 and with address 33 mode 4).
- When the battery is disconnected.
- When the engine control module is disconnected (e.g. connecting test box VAG 1598/19, replacing ECM, etc.).
To generate the readiness code, take a "mixed city and highway" drive (short test). A "mixed city and highway" drive is understood to be 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.
The "Trip Status" display (display field 2) shows which components and/or systems have been checked since the start of the trip. After successful diagnosis, the current display value is set to "1" whether the diagnosis was recognized as OK or not OK. The trip-status display is reset to "0" at each start since the components and/or systems are checked at each new start. A "trip" is understood to be a drive 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, with preceding cold start.
The readiness code display (display field 1) shows whether the components and/or systems checked in display field 2 were recognized as OK or not OK by the engine control module.
- If the diagnosis is recognized as OK, the current display value is set to "0."
- If the diagnosis is recognized as not OK, the current display value is not set to "0", it stays at "1."
- If every component and/or system has operated at least once with positive results, all display values of the readiness code are set to "0."
- If, during another diagnosis, a component and/or system is recognized as not OK, the readiness code is not reset to "1."
If the trip status display is set to "1" when the readiness code is regenerated, but the corresponding display value of the readiness code is not set to "0", the diagnosis was carried out but recognized as not OK by the engine control module. In this case, the DTC memory should be checked to determine malfunctions and/or to carry out a selective diagnosis:
- For three way catalytic converter diagnosis (Bank 1 and 2) also check display groups 035, 036 and 044.
- For the Evaporative Emissions (EVAP) system leak diagnosis, also check display group 030.
- For the Secondary Air Injection (AIR) system throughput and leak diagnosis, also check display groups 020 and 021.
- For oxygen sensor diagnosis, also check display groups 032, 033, 034, 041, 042 and 043.
- For oxygen sensor heating diagnosis, also check display group 040.
- For the Exhaust Gas Recirculation (EGR) system throughput diagnosis, also check display group 017.
Display group 029:
NOTE ON DISPLAY FIELD 1:
- All readiness code values are set to "1" by disconnecting the ECM harness connector and/or disconnecting the battery, and every time DTC memory is erased (both with address word 01 function 05 and with address word 33 mode 4).
- To regenerate the readiness code, take a drive 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 ("mixed city and highway" trip).
- Value "0" = Diagnosis carried out
- Value "1" = Diagnosis not OK and/or diagnosis not carried out yet
NOTE ON DISPLAY FIELD 2:
- The display values are set to "0" at each start, since the function capability of components and systems that can affect the exhaust are checked again and again.
- Leak testing of the EGR system is only carried out after a preceding cold start (water temperature -10 °C to 30 °C (14 ° to 86 °F).
- Value "0" = Diagnosis not carried out yet
- Value "1" = Diagnosis carried out
NOTE ON DISPLAY FIELDS 3 AND 4:
- Display field 3 evaluates all malfunctions except "Combustion misfiring and oxygen sensor control."
- Display field 4 evaluates only the malfunctions "Combustion misfiring and oxygen sensor control."
- If a malfunction is recognized, the corresponding counter will be set to "40." The counter is decremented, during a new start, when the trip was started at coolant temperature of 49 °C (120 °F) and ended at a water temperature of 71 °C (160 °F) and the malfunction is no longer recognized. However, decrementing is only allowed if the MIL has not lit up yet or is no longer lit. When counter status "0" is reached, the recognized malfunction is erased.
- If the DTC memory is erased, the counter is also decremented.