Manufacturer Code Charts: 160900

Component B1 (Oil temperature sensor) has a malfunction.


Possible cause:

- B1 (Oil temperature sensor)
Affected functions:

- Power generation

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

Test 1: Check component B1 (Oil temperature sensor).

1. Check component B1 (Oil temperature sensor).
Check wiring harness 'B1 (Oil temperature sensor)'.
Possible cause and remedy

- Inspect connector at component B1 (Oil temperature sensor) for damage, loose contacts and corrosion, repair if necessary.
- Check connector contacts at control unit N3/9 (CDI control unit) for proper attachment, damage and corrosion.
- Inspect cables, connectors, plug connections and electrical components for damage, correct connection, loose contact and corrosion.
Question

- Were the tests okay?


YES
Check actual value B1 (Oil temperature sensor).
Important note

- If a fault exists, the coolant temperature is displayed as a substitute value.
Test prerequisite

- Ignition ON
Status of relevant actual value:
- Oil temperature:Warning! Communication with ECU required.
Specified value

- If the connection is unplugged at component B1 (Oil temperature sensor), the value is approx. 70° C.
- Oil temperature:Temperature > [ 70° C ] when engine warm
Question

- Is the actual value o.k.?


YES
The actual value is okay.Test wiring and plug connections between control module N3/9 (CDI control unit) and B1 (Oil temperature sensor) for Loose contact, repair or replace if necessary.End of test

NO
Power supply Check component B1 (Oil temperature sensor).
Figure legend

- B1 (Oil temperature sensor)
Test prerequisite

- The actual value is not o.k.
Test sequence

- Switch off ignition.
- Detach coupling at component B1 (Oil temperature sensor).
- Measure direct voltage with multimeter between sockets (B1x1) 2 and (B1x1) 1
Specified value

- Voltage[3.1...3.5] V
Question

- Is the measurement value OK?







YES
Test signal line between components N3/9 (CDI control unit) and B1 (Oil temperature sensor) for Open circuit.
Figure legend

- B1 (Oil temperature sensor)
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.54) 54 of the 126-pole socket box tester and socket (B1x1) 1
Specified value

- Resistor< 1ohms
Question

- Is the measurement value OK?







YES
The measurement value is OK.Replace component B1 (Oil temperature sensor).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 54) to component B1 (Oil temperature sensor) (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 B1 (Oil temperature sensor) for Open circuit.
End of test

NO
The tests were not okay.Possible cause and remedy:Test wiring and plug connections between control module N3/9 (CDI control unit) and B1 (Oil temperature sensor) for Loose contact, repair or replace if necessary.End of test