Manufacturer Code Charts: 124800
The supply voltage to the sensors is outside the valid range.
Possible cause:
- Supply voltage
Affected functions:
- Power generation
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Test 1: Test voltage supply.
1. Test voltage supply.
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 B5/1 (Charge pressure sensor).
Test 1.3: 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 B5/1 (Charge pressure sensor).
Check actual value B5/1 (Charge pressure sensor).
Test prerequisite
- Ignition ON
Status of the relevant actual values:
- B2/6b1 (Left intake air temperature sensor):Warning! Communication with ECU required.
- Boost pressure:Warning! Communication with ECU required.
- Intake air pressure:Warning! Communication with ECU required.
NOTE
- When the coupling on component B5/1 (Charge pressure sensor) is unplugged, a substitute value of approx. 800 hPa is displayed.
- Actual value 'Boost pressure' only changes once the ignition has been switched on again.
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 +/- 101 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 +/- 60 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 +/- 101 hPa.
Question
- Are the actual values o.k.?
YES
The actual value is okay.Further procedure
- Test wiring and plug connections between control module N3/9 (CDI control unit) and B5/1 (Charge pressure sensor) for Loose contact, repair or replace if necessary.
End of test
NO
Voltage supply of component B5/1 (Charge pressure sensor)
Figure legend
- B5/1 (Charge pressure sensor)
- M16/6 (Throttle valve actuator)
- The muffler was removed from the picture to improve the view.
Test prerequisite
- The actual value is not o.k.
- Muffler is installed.
Test sequence
- Switch off ignition.
- Detach coupling at component B5/1 (Charge pressure sensor).
- Install adapter cable with MB part number 646 589 00 63 00 inside connector B5/1 (Charge pressure sensor).
- Measure direct voltage with multimeter between sockets (B5/1x1) 1 and (B5/1x1) 3
- Switch on ignition.
Specified value
- Voltage[4.75...5.25] V
Question
- Is the measurement value OK?
YES
Signal cable of component B5/1 (Charge pressure sensor)
Figure legend
- B5/1 (Charge pressure sensor)
- M16/6 (Throttle valve actuator)
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.85) 85 of the 126-pole socket box tester and socket (B5/1x1) 2
Specified value
- Resistor< 1ohms
Question
- Is the measurement value OK?
YES
The measurement value is OK.Possible cause and remedy
- Replace component B5/1 (Charge pressure sensor).
End of test
NO
The signal line from component B5/1 (Charge pressure sensor) has Open circuit.
The measurement value is not OK.Possible cause and remedy
- The signal line from component B5/1 (Charge pressure sensor) has Open circuit.
- Check affected lines and repair if necessary.
End of test
NO
The measurement value is not OK.Possible cause and remedy
- Test lines between components N3/9 (CDI control unit) and B5/1 (Charge pressure sensor) for Short circuit or open circuit.
End of test
1.3. 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 NOTEThe 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.
1.3. No further information available.