VW TDI Engine Sensors A4 2001+ - AWX/AVF

Ad group for A4 models from production month 2001 onwards (AWX/AVF).
001 Quantity adjustment.
Engine readings at idle, coolant temperature minimum 85°C:
Engine speed.
Manual transmission: 860-940 RPM.
Automatic transmission: 790...870/min.
2) Injection amount / Quantity of injection.
3.0...13.0 mg/dose A acceptable.
Small, 3.0 mg/stroke injector pump nozzle units defective => check/replace.
Greater than 13.0 mg/stroke. Indicates fuel starvation or air in the fuel system.
=> check
Defective pump-nozzle units => Pump-nozzle.
Replacing units.
3) Actuation time of the proportional valve.
3...8 °KW A OK.
4) Coolant temperature.
85...110 °C A OK.
Warm up the small 85°C A motor.

002 Engine idle speed.
Engine readings at idle, coolant temperature minimum 85°C:
Engine speed.
Manual transmission: 860-940 RPM.
Automatic transmission: 790...870/min.
2) Accelerator pedal position.
0.0% A, as received.
greater than 0.0% A Throttle position sensor incorrect.
turned off or defective.
3) Operating condition
X X 1: Air conditioner compressor signal => Air conditioning system is turned on.
X 1 X: Vacuum switch closed.
1 X X: Idle speed increased (because the air conditioning is turned on).
4) Coolant temperature.
85...110 °C A OK.
small 85°C => engine warm-up.

003 Exhaust gas recirculation.
Engine readings at idle, coolant temperature minimum 85°C:
Engine speed.
Manual transmission: 860-940 RPM.
Automatic transmission: 790-870 RPM.
2) Exhaust gas recirculation (EGR) target value.
230...310 mg/dose. Acceptable.
Larger than 310 mg/dose. Engine is cold. Warm up the engine.
3) Exhaust gas recirculation (EGR) actual value.
"Target air mass in display field 2 (tolerance +/- 20 mg per cycle), A, OK."
Insufficient air mass: Air leak in the intake area.
Excessive exhaust gas recirculation => check.
Excess air mass: insufficient exhaust gas recirculation => check.
Engine has been running at idle for 10 minutes => brief.
Gasstoß abgeben.
Constant display: Replacement value.
4) Duty cycle for controlling the exhaust gas recirculation valve.
40...75%

004 Injection start.
Engine readings at idle, coolant temperature minimum 85°C:
Engine speed.
Manual transmission: 860-940 RPM.
Automatic transmission: 790...870/min.
2) Injection start target value.
-4 °KW (from top dead center)...2.5 °KW (from bottom dead center) A, in good working order.
3) Target injection duration.
5...7 °KW: OK.
4) Synchronization angle.
-3...+3 °C equivalent.
larger than +3 kW or smaller than -3 kW: Hall sensor G40 is defective; gap dimension between...
Donor wheel and camshaft sprocket not in good condition; wiring interruption or...
Short circuit to ground on the Hall sensor - G40 sensor loose, encoder disc damaged.
twisted

Messwerte bei Vollast (Probefahrt im 3. oder 4. Sure, here is the translation of the text from German to English:

"Gang",
Coolant temperature minimum 85°C:
Engine speed.
2800...3200 /min: Within normal limits.
2) Injection start target value.
-13°KW...-23°KW (=> from OT): OK.
larger than -1°KW: Engine is too cold => allow it to warm up.
3) Target injection duration.
16...28 kW
4) Synchronization angle.
-3...+3°KW

005 Initial set.
Engine speed.
Manual transmission: 860-940 RPM.
Automatic transmission: 790...870/min.
2) Initial amount / Starting quantity
7...18 mg/H
3) Initial synchronization.
Bitte gib mir den deutschen Text, den du übersetzt haben möchtest.
4) Coolant temperature.
85...110 °C A OK.
small 85°C => engine warm-up.

006 Switch positions.
1) Current vehicle speed.
[km/h]
2) Pedal monitoring.
X X 1 Brake light switch F
X 1 X Brake pedal switch F47 (redundant brake).
1 x Clutch Pedal Switch, BMW F36.
3) Pedal position sensor.
[%]
4) GRA status
text
0 GRA enabled/disabled in the control unit.
text
1 GRA enabled in the control unit / on.
255 GRA (Gear Ratio Adaption) not activated in the control unit.

007 Temperature Sensor.
Measurements taken during ignition, engine off, and after cooling down:
Fuel temperature.
fuel temperature sensor (G81)
2) to disregard; to ignore; to overlook.
3) Intake air temperature.
at the air intake temperature sensor (G42).
4) Coolant temperature.
"at the coolant temperature sensor G62".

008 Fuel injection quantity limitation 1.
Engine readings at idle, coolant temperature minimum 85°C:
Engine speed.
Manual transmission: 860-940 RPM.
Automatic transmission: 790...870/min.
2) Desired fuel injection amount (throttle position).
0 mg/dose
3) Torque limitation.
25...35 mg/dose For oral use.
4) Smoke characteristic curve.
16...34 mg per dose.

Messwerte bei Vollast (Probefahrt im 3. Oder 4. Sure, here is the translation of the text from German to English:

"Gang" translates to "gang" in English.
Coolant temperature must not be below 85°C.
Engine speed.
2800...3200 /minute
2) Desired fuel injection amount (throttle position).
greater than 65 mg/dose; acceptable.
Small dose: 65 mg per injection. Accelerator pedal not fully depressed, incorrectly adjusted.
or defective => check.
3) Torque limitation.
47...51 mg/dose As O.K.
Small value (47 mg/H): Speed too high or too low.
Greater than 51 mg/H: Increase in fuel injection volume through tuning.
4) Smoke characteristic curve.
47...60 mg/dose.
Small value (47 mg/H): Insufficient air mass detected => Check the air mass sensor.
Exhaust gas recirculation under full load => check.

009 Fuel injection quantity limitation 2.
Engine readings at idle, coolant temperature minimum 85°C:
Engine speed.
Manual transmission, 820-900 RPM.
Automatic transmission: 790...870/min.
2) GRA
[mg/dose]
3) Automatic transmission.
[mg/dose]
4) Boundary set.
16...34 mg per injection.

Messwerte bei Vollast (Probefahrt im 3. Oder 4. Sure, here is the translation of the text from German to English:

"Gang" translates to "gang" in English.
Coolant temperature must not be below 85°C.
Engine speed.
2800...3500 /min
2) GRA
[mg/dose]
3) Automatic transmission.
[mg/dose]
4) Boundary set.
47...60 mg/dose.


010 Air parameters.
Engine readings at idle, coolant temperature minimum 85°C:
1) air mass drawn in
210...350 mg/hour.
If other than tolerance => see ad group 003 when idling.
2) atmospheric pressure (ambient air pressure)
[mbar]
3) Intake manifold pressure (boost pressure).
[mbar]
4) Accelerator pedal position.
0.0%
greater than 0%: Throttle position sensor incorrectly calibrated or defective.

Messwerte bei Vollast (Probefahrt im 3. Oder 4. Sure, here is the translation of the text from German to English:

"Gang",
Coolant temperature must not be below 85°C.
1) Air intake mass.
greater than 750 mg/dose; as per instructions.
Small dose: 750 mg per injection. Engine speed is too high or too low.
Boost pressure too low. Display field 3.
observe, air leak between air...
Mass airflow sensor and turbocharger.
2) Ambient air pressure.
[mbar]
3) Intake manifold pressure (boost pressure)
2100...2600 mbar, good condition.
except for tolerance: Boost pressure control defective -> display group 11.
4) Accelerator pedal position.
Press the gas pedal: 100%.
Slightly depressed accelerator pedal (not fully pressed), accelerator pedal sensor.
position incorrectly adjusted or defective.

011 Turbocharger pressure control.
Engine readings at idle, coolant temperature minimum 85°C:
Engine speed.
Manual transmission: 860-940 RPM.
Automatic transmission: 790...870/min.
2) Target boost pressure.
900...1100 millibars.
3) Actual boost pressure value.
850...1150 millibars.
4) Duty cycle (control of solenoid valve).
20...50%

Messwerte bei Vollast (Probefahrt im 3. Oder 4. Sure, here is the translation of the text from German to English:

"Gang",
Coolant temperature must not be below 85°C.
Engine speed.
2800...3200/min
2) Target boost pressure.
2200...2400 millibars.
above 2400 mbar: Increase in boost pressure through tuning.
3) Actual boost pressure value.
2100...2600 millibars.
Low pressure (below 2100 mbar) or high pressure (above 2600 mbar): Turbocharger boost control defective, exhaust turbocharger defective.
4) Duty cycle (control of solenoid valve).
35...80%

012 Preheating system.
1) Glow status
11111111 Glowing out.
00010000 Preheat.
01110000 Initial glow.
11110000: Preheating.
10110000 Afterglow
00110000 Preheat glow.
2) Preheating time.
[s]
3) Supply voltage for the motor control unit.
[V]
4) Coolant temperature.
[°C]

013 Idle speed control.
Measurements taken at idle.
1) Fuel injection quantity deviation, cylinder 1:
[mg/dose]
2) Fuel injection quantity deviation, cylinder 2:
[mg/dose]
3) Fuel injection quantity deviation, cylinder 3:
[mg/dose]
4) Fuel injection quantity deviation, cylinder 4:
[mg/dose]
Set Point: -2.8 to +2.8 mg/stroke.
+...mg/H: the respective cylinder has lower power output and is therefore...
therefore, it is supplied with more fuel.
- ...mg/H: The respective cylinder is more powerful and will be...
therefore, it is supplied with less fuel.

015 Fuel consumption.
Engine speed.
[1/min]
2) Injection quantity - actual value.
3...9 mg/dose.
3) Fuel consumption.
[ltr/h]
4) Desired fuel injection quantity.
[mg/dose]
Driver preference via accelerator pedal.

016 Auxiliary heater.
1) Generator load.
[%]
2) Shutdown conditions.
X X X X X X X 1 Coolant temperature > 70 °C or intake air temperature > 5 °C
XXXXXX 1 X Generator failure.
X X X X X 1 X X Battery voltage below 9V.
X X X X 1 X X X: Engine speed below 800 RPM.
X X X 1 X X X X: Engine started within the last 10 seconds.
X X 1 X X X X X Coolant temperature sensor or intake manifold temperature sensor defective.
X 1 X X X X X X Heating request.
1 X X X X X X X - ignore.
3) Relay output.
X X X X X X X 1 Activate relay for low heating power.
X X X X X X 1 X Activate relay for high heating power.
4) Onboard voltage.
[V]

018 Series Magnetic Valves.
1) Status valve for pump nozzle 1.
0: OK.
A numerical value other than 0.
Nozzle injector unit valve defective => Check valves for nozzle injectors.
Fuel shortage or air in the fuel system => check.
2) Status valve for pump nozzle.
0: OK.
text
other numerical value than 0: => display field 1
3) Status valve for pump nozzle.
0: OK.
text
other numerical value than 0: => display field 1
4) Status valve for pump nozzle.
0: OK.
text
other numerical value than 0: => display field 1


020 Quantity adjustment via ABS over CAN.
Engine speed.
Manual transmission: 860-940 RPM.
Automatic transmission: 790...870/min.
2) Motor torque.
20...70 Nm
3) ASR intervention.
[mg/H]
4) MSR intervention.
[mg/H]

022 Switching states.
1) GRA shutdown status.
GRA disabled.
1. GRA active (out).
9. GRA active (switch on).
2) GRA Status
0 0 0 0 0 0 OFF
0 0 0 0 1 1 ON
text
0 0 0 1 1 1 SET
text
0 0 1 0 1 1 RES
0 0 0 0 0 1: Button pressed to turn OFF.
3) Turbocharger pressure control status.
[ ]
4) Climate control status.
[ ]

023 GDP Deviation.
Measurements taken at idle.
1) Cylinder 1:
-100...100
2) Cylinder 2:
-100...100
3) Cylinder 3:
-100...100
4) Cylinder 4:
-100...100

125 CAN channel allocation.
1) Transmission control unit.
2) ABS control unit.
3) Combined instrument cluster control unit.
4) Airbag control unit.
Each bit represents a single value: 0 = inactive.
1 = active
--- = not available / not CAN-capable.

Dieselmattes wrote:

010 Air parameters. Messwerte bei Vollast (Probefahrt im 3. Oder 4. Sure, here is the translation of the text from German to English: "Gang", Coolant temperature must not be below 85°C. 1) Air intake mass. greater than 750 mg/dose A.O.K.

Hi,

ist ja ganz nett, aber woher stammen denn z.B. die o.a. Data?

At an air mass of 750 mg, the turbidity of the AWX (in the Passat) releases approximately 40 mg of diesel fuel.

The dynamometer shows values of up to 52 mg at 2000 rpm or 47 mg at 4000 rpm. If the lambda value (air-fuel ratio) is supposedly already acceptable, there could still be a shortfall of approximately 15-23% of the normal full-throttle fuel amount.

If VAG customers are dismissed with complaints about performance deficiencies by being told that everything is "within the acceptable range" based on such questionable standards, I am less and less surprised by the widespread skepticism towards technical information provided by workshops.

Well, 750 is just the lower limit that should be present at 3000 RPM.
If it starts going under, you can probably start thinking about getting rid of the LMM (likely referring to a lambda/oxygen sensor).
Very few customers will notice a decrease in performance up to this limit.
I haven't had anyone complain about a lack of performance with dosages around 800mg.
When they arrive, the LMM (likely referring to a medical device or medication delivery system) either completely stops working and no longer delivers 400mg. In about 10% of cases, it then delivers between 500 and 600 mg/hour. (This is based on practical experience).

Where did you get these setpoint tables from?

According to my records, the target mass flow rate (mass flow setpoint) for AVF/AWX is between 210.0 and 350.0 mg/hour.

210...350 at idle, maybe!

What exactly is stated above in the table:

Engine readings at idle, coolant temperature minimum 85°C:
1) intake air mass
210...350 mg/hour

vagtuning wrote:

210...350 at idle, maybe!

Yep, for idle speed (with a slight throttle blip).

For full load conditions, various values can be found, for example, AVF (average filter value) at 4 bar: 850.0...1050.0 mg/H.

"...which still doesn't seem to fit the table above, or am I just not seeing something?"

Besswerwisser wrote:

...which still doesn't fit the table above, or am I just not seeing it?

I don't think so.

The list is also internally inconsistent (if you know the background of the software).

Quote:

008 Einspritzmengenbegrenzung 1 - Messwerte bei Vollast (Probefahrt im 3. Oder 4. Sure, here is the translation of the text from German to English: "Gang" translates to "gang" in English. Bitte gib mir den deutschen Text, den du übersetzt haben möchtest. 4) Smoke characteristic curve: 47...60 mg/stroke. Small 47 mg/H: Detected air mass is too low => Check the air mass sensor . Bitte gib mir den deutschen Text, den du übersetzt haben möchtest. 010 Luftgrössen - Messwerte bei Vollast (Probefahrt im 3. Oder 4. Sure, here is the translation of the text from German to English: "Gang," 1) Intake air mass greater than 750 mg/stroke, within specification. If, for example, the MWB 10 contains 760 mg of air, that's okay, but in the MWB 8, the turbidity might be at 41 mg -> check LLM

.

-> If the list is an official VAG document, I would like to see how "regular" workshops handle such cases.

Many workshops check for performance issues, focusing primarily on test points 10 and 11.
If that's okay, then the customer is just imagining it.

Hello!

These are the original values from the tester at VW/Audi that can be accessed via diagnostic data blocks.
can be read. What's there to complain about? The limit on the amount of Russian [something] is in the...
MSG is set. And measurement block 8, in my opinion, refers to...
Injection volume in mg per injection, not based on air mass.

Alright man.

Matte.

Dieselmattes wrote:

According to my understanding, measurement block 8 refers to the... Injection volume in mg/dose and not based on air mass.

In the case of smoke limitation, the value can indeed be determined from the air mass (and the turbidity factor).
With 750 mg of air, the AWX device doesn't release 40 mg of diesel fuel, which suggests that the programming in the VW/Audi test might be flawed at this point.

Even if it's a typo and "850 mg of air" (a common maximum value in the AGR-MWB 3 standard) was intended, that still isn't enough to produce 47 mg [of something], but only about 45 mg of diesel.