Manufacturer Code Charts: 2042

[1] Check component B40 (Oil sensor (oil level, temperature and quality)).: Water in the oil (milky clouding with smears) The water content is too high.

Test 1: Check component B40 (Oil sensor (oil level, temperature and quality)).

1. Check component B40 (Oil sensor (oil level, temperature and quality)).
Check actual value B40 (Oil sensor (oil level, temperature and quality)).
Test prerequisite

- Operate engine at idling speed.
Status of the relevant actual values:
- Oil level:Warning! Communication with ECU required.

- Oil temperature:Warning! Communication with ECU required.

- Oil quality:Warning! Communication with ECU required.
Specified values

- Oil level:[55...67] mm(The limit values correspond to the min./max. level at the dipstick.)
- Oil temperature:Temperature > [ 70° C ] when engine warm
- Oil quality:[1...6]
Question

- Are the actual values o.k.?


YES
The actual values are okay.Test wiring and plug connections between control module N3/9 (CDI control unit) and B40 (Oil sensor (oil level, temperature and quality)) for Loose contact, repair or replace if necessary.End of test

NO
Power supply Check component B40 (Oil sensor (oil level, temperature and quality)).
Figure legend

- B40 (Oil sensor (oil level, temperature and quality))
Test prerequisite

- At least one of the relevant actual values is not okay.
Test sequence

- Switch off ignition.
- Detach coupling at component B40 (Oil sensor (oil level, temperature and quality)).
- Measure direct voltage with multimeter between sockets (B40x1) 2 and (B40x1) 3
- Switch off ignition.
Specified value

- Voltage[4.9...5.1] V
Question

- Is the measurement value OK?







YES
Test signal line between components N3/9 (CDI control unit) and B40 (Oil sensor (oil level, temperature and quality)) for Open circuit.
Figure legend

- B40 (Oil sensor (oil level, temperature and quality))
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.34) 34 of the 35-pole socket box tester and socket (B40x1) 1
Specified value

- Resistor< 1ohms
Question

- Is the measurement value OK?







YES
The measurement value is OK.Replace component B40 (Oil sensor (oil level, temperature and quality)).End of test

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

- Test cable from control module N3/9 (CDI control unit) (socket M, pin 34) to component B40 (Oil sensor (oil level, temperature and quality)) (pin 1) 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 B40 (Oil sensor (oil level, temperature and quality)) for Open circuit.


1. No further information available.