[2] Check component B5/1 (Charge pressure sensor).: The signal voltage is too low.

[2] Check component B5/1 (Charge pressure sensor).: The signal voltage is too low.


Possible cause:

- B5/1 (Charge pressure sensor)
- Engine compartment CAN databus
Affected functions:

- Engine diagnosis

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

Test 1: Plausibility check of pressure sensors

1. Plausibility check of pressure sensors
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 prerequisite

- Switch off ignition.
- Detach coupling at component 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[4.8...5.1] 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)
- The muffler was removed from the picture to improve the view.
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.82) 82 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