Manufacturer Code Charts: 124600

The supply voltage to the sensors is outside the valid range.


Possible cause:

- Supply voltage
Affected functions:

- Power generation

-------------------------------------------------

Test 1: Supply voltage Test sensor 1.

1. Supply voltage Test sensor 1.

Test 1.1: If fault codes for several sensors are displayed at the same time, then one sensor has a short circuit to GND or to POS at the component or at the lead.

Test 1.2: Check component B28/5 (Pressure sensor downstream of air cleaner).

Test 1.3: Check component B28/8 (Pressure differential sensor (DPF)).

Test 1.4: Check component B60 (Exhaust back pressure sensor).

1.1. If fault codes for several sensors are displayed at the same time, then one sensor has a short circuit to GND or to POS at the component or at the lead.

1.1. No further information available.


1.2. Check component B28/5 (Pressure sensor downstream of air cleaner).
Check actual value B28/5 (Pressure sensor downstream of air cleaner).
Test prerequisite

- Ignition ON
IMPORTANT NOTE: The air extractor system may not be connected to the exhaust system during the test.Status of the relevant actual values:
- B2/6b1 (Left intake air temperature sensor):Warning! Communication with ECU required.

- Intake air pressure:Warning! Communication with ECU required.

- Boost pressure:Warning! Communication with ECU required.
Specified value at a temperature < 10 °C

- With the ignition on, the values for intake air pressure and boost pressure may not deviate from one another by more than +/- 39 hPa.
Specified value range: 10 °C - 85 °C

- With the ignition on, the values for intake air pressure and boost pressure may not deviate from one another by more than +/- 24 hPa.
Specified value at a temperature > 85 °C

- With the ignition on, the values for intake air pressure and boost pressure may not deviate from one another by more than +/- 39 hPa.
Question

- Are the read-out values OK?


YES
The actual values are okay.Further procedure

- Test wiring and plug connections between control module N3/9 (CDI control unit) and B28/5 (Pressure sensor downstream of air cleaner) for Loose contact, repair or replace if necessary.
End of test

NO
Voltage supply of component B28/5 (Pressure sensor downstream of air cleaner)
Figure legend

- B28/5 (Pressure sensor downstream of air cleaner)
Test prerequisite

- The actual values are not okay.
Test sequence

- Switch off ignition.
- Detach coupling at component B28/5 (Pressure sensor downstream of air cleaner).
- Measure direct voltage with multimeter between sockets (B28/5x1) 1 and (B28/5x1) 3
- Switch on ignition.
Specified value

- Voltage[4.75...5.25] V
Question

- Is the measurement value OK?







YES
Signal cable of component B28/5 (Pressure sensor downstream of air cleaner)
Figure legend

- B28/5 (Pressure sensor downstream of air cleaner)
Special tools

- Test cable 266 589 01 63 00
- Socket box 129 589 00 21 00
Test sequence

- Switch off ignition.
- Unplug connector of control module and component.
- Connect 126-pole socket box at engine wiring harness.
- Measure resistance with multimeter between socket (M.78) 78 of the 126-pole socket box tester and socket (B28/5x1) 2
Specified value

- Resistor< 1ohms
Question

- Is the measurement value OK?







YES
The measurement value is OK.Possible cause and remedy

- Replace component B28/5 (Pressure sensor downstream of air cleaner).
End of test

NO
The measurement value is not OK.Possible cause and remedy

- Repair / replace faulty wiring between N3/9 (CDI control unit) and B28/5 (Pressure sensor downstream of air cleaner)
End of test

NO
The measurement value is not OK.Possible cause and remedy

- Check voltage supply lines of component B28/5 (Pressure sensor downstream of air cleaner) as per wiring diagram.


1.2. No further information available.


1.3. Check component B28/8 (Pressure differential sensor (DPF)).
Check actual value B28/8 (Pressure differential sensor (DPF)).
Test prerequisite

- Ignition ON
- The air extractor system may not be connected to the exhaust system during the test.
Status of the relevant actual values:
- Coolant temperature:Warning! Communication with ECU required.

- Differential pressure Signal voltage:Warning! Communication with ECU required.
Specified value at coolant temperature between 10 °C and 85 °C

- Differential pressure Signal voltage464...682 mV
Specified value at coolant temperature < 10 °C or > 85 °C

- Differential pressure Signal voltage428...718 mV
Question

- Is the actual value o.k.?


YES
The actual value is okay.Figure legend

- B28/8 (Pressure differential sensor (DPF))
Further procedure

- Test wiring and plug connections between control module N3/9 (CDI control unit) and B28/8 (Pressure differential sensor (DPF)) for Loose contact, repair or replace if necessary.
End of test







NO
Check power supply of component B28/8 (Pressure differential sensor (DPF)).
Figure legend

- B28/8 (Pressure differential sensor (DPF))
Special tool

- Adapter cable611 589 03 63 00
Test prerequisite

- The actual value is not o.k.
Test sequence

- Switch off ignition.
- Detach coupling at component B28/8 (Pressure differential sensor (DPF)).
- Connect adapter cable no. 611 589 03 63 00 to engine wiring harness B28/8 (Pressure differential sensor (DPF)).
- Measure direct voltage with multimeter between sockets (B28/8x1) 2 and (B28/8x1) 3
- Switch on ignition.
Specified value

- Voltage[4.9...5.2] V
Question

- Is the measurement value OK?







YES
Check signal lines on component B28/8 (Pressure differential sensor (DPF)).
Figure legend

- B28/8 (Pressure differential sensor (DPF))
Special tools

- Test cable 266 589 01 63 00
- Socket box 129 589 00 21 00
- Adapter cable611 589 03 63 00
Test sequence

- Switch off ignition.
- Unplug connector of control module and component.
- Connect 126-pole socket box at engine wiring harness.
- Measure resistance with multimeter between socket (M.31) 31 of the 126-pole socket box tester and socket (B28/8x1) 1
Specified value

- Resistor<1ohms
Question

- Is the measurement value OK?







YES
The measurement value is OK.Further procedure

- Check signal line of component B28/8 (Pressure differential sensor (DPF)) for short circuit to positive.
- Check signal line of component B28/8 (Pressure differential sensor (DPF)) for short circuit to ground.
- Replace component B28/8 (Pressure differential sensor (DPF)).
Note

- After replacing component B28/8 (Pressure differential sensor (DPF)), the teach-in process for this component must be performed via menu 'Control unit adaptations'.
End of test

NO
The measurement value is not OK.Possible cause and remedy

- Repair or replace faulty cable N3/9 (CDI control unit)- B28/8 (Pressure differential sensor (DPF)).
End of test

NO
The measurement value is not OK.Possible cause and remedy

- Check voltage supply lines of component B28/8 (Pressure differential sensor (DPF)) as per wiring diagram.
End of test

1.4. Check component B60 (Exhaust back pressure sensor).
Important note: The sensor is ventilated by means of a bore underneath the plug.If the plug is disconnected and then plugged back in, an incorrect pressure value is briefly displayed.To ensure that the positive pressure is safely released, wait for approx. 3 min.

Check actual value B60 (Exhaust back pressure sensor).
Test prerequisite

- Ignition ON
IMPORTANT NOTE: The air extractor system may not be connected to the exhaust system during the test.Status of the relevant actual values:
- B19/11 (Temperature sensor upstream of turbocharger):Warning! Communication with ECU required.

- Intake air pressure:Warning! Communication with ECU required.

- Exhaust back pressure:Warning! Communication with ECU required.
NOTE

- If the connection is unplugged at component B60 (Exhaust back pressure sensor), the value is approx. 5000 hPa.
- Actual value 'Exhaust back pressure' only changes once the ignition has been switched on again.
Specified value at a temperature < 0 °C

- With the ignition on, the values for intake air pressure and exhaust back pressure may not deviate from one another by more than +/- 119 hPa.
Specified value range: 0 °C - 125 °C

- With the ignition on, the values for intake air pressure and exhaust back pressure may not deviate from one another by more than +/- 94 hPa.
Specified value at a temperature > 125 °C

- With the ignition on, the values for intake air pressure and exhaust back pressure may not deviate from one another by more than +/- 169 hPa.
Question

- Is the actual value o.k.?


YES
The actual value is okay.Figure legend

- B60 (Exhaust back pressure sensor)
Further procedure

- Test wiring and plug connections between control module N3/9 (CDI control unit) and B60 (Exhaust back pressure sensor) for Loose contact, repair or replace if necessary.
End of test







NO
Voltage supply of component B60 (Exhaust back pressure sensor)
Figure legend

- B60 (Exhaust back pressure sensor)
Test prerequisite

- The actual value is not o.k.
Test prerequisite

- Switch off ignition.
- Detach coupling at component B60 (Exhaust back pressure sensor).
- Measure direct voltage with multimeter between sockets (B60x1) 2 and (B60x1) 1
- Switch on ignition.
Specified value

- Voltage[4.75...5.25] V
Question

- Is the measurement value OK?







YES
Signal cable of component B60 (Exhaust back pressure sensor)
Figure legend

- B60 (Exhaust back pressure sensor)
Special tools

- Test cable 266 589 01 63 00
- Socket box 129 589 00 21 00
Test sequence

- Switch off ignition.
- Unplug connector of control module and component.
- Connect 126-pole socket box at engine wiring harness.
- Measure resistance with multimeter between socket (M.79) 79 of the 126-pole socket box tester and socket (B60x1) 3
Specified value

- Resistor< 1ohms
Question

- Is the measurement value OK?







YES
The measurement value is OK.Possible cause and remedy

- Test signal line between components N3/9 (CDI control unit) and B60 (Exhaust back pressure sensor) for Open circuit.
- Replace component B60 (Exhaust back pressure sensor).
End of test

NO
The measurement value is not OK.Possible cause and remedy

- Test signal line between components N3/9 (CDI control unit) and B60 (Exhaust back pressure sensor) for Open circuit.
End of test

NO
The measurement value is not OK.Possible cause and remedy

- Test lines between components N3/9 (CDI control unit) and B60 (Exhaust back pressure sensor) for Open circuit.


1.4. No further information available.