11A000

The negative control deviation during boost pressure control is too high.


Possible cause:

- B60 (Exhaust back pressure sensor)
Affected functions:

- Power generation

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Test 1: Check component B60 (Exhaust back pressure sensor).

1. 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. No further information available.