159D00

Component B5/1 (Charge pressure sensor) has a short circuit to positive.


Possible cause:

- B5/1 (Boost pressure sensor)
Affected functions:

- Power generation

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Test 1: Check component B5/1 (Charge pressure sensor).

1. 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