P2561
Implausible data were received from the air conditioning.
Possible cause:
- Hybrid CAN bus
Affected functions:
- Engine diagnosis
- Engine start
- Engine output
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Test 1: Test CAN connection to X30/44 (Hybrid CAN potential distributor connector).
1. Test CAN connection to X30/44 (Hybrid CAN potential distributor connector).
Check CAN lines of hybrid CAN bus.
Figure legend
- Component X30/44 (Hybrid CAN potential distributor connector) is located behind component N10/1 (Front SAM control unit with fuse and relay module).
Test prerequisite
- CAN communication is faulty.
- Relevant fault codes are present, or communication with control module cannot be established.
Test sequence
- Switch off ignition.
- Disconnect all electrical connectors at component X30/44 (Hybrid CAN potential distributor connector).
- Measure resistance with multimeter between sockets ( X30/44 ) 1 and ( X30/44 ) 2
NOTE
- Perform measurement at all electrical connectors.
Specified value(Valid for four measurements)
- Resistor[ 47.5...52.5] kohms
Specified value(Only valid for one measurement)
- Resistor[ 23.5...27.5] kohms
Question
- All readouts o.k. ?
YES
Total resistance of hybrid CAN bus
REQUIREMENT
- The measurement values are OK.
Additional measures
- Perform measurement at component X30/44 (Hybrid CAN potential distributor connector).
- Measure resistance with multimeter between pins ( X30/44 ) 1 and ( X30/44 ) 2
Adapter cable no. W220 589 00 99 38 may be used.Warning!Repeat measurement at all slots of the component.Specified value
- [55...65]ohms
Question
- Is the measured value within the specified value range?
YES
Test procedure ground cable
Preconditions
- The measurement value is OK.
Further procedure
- Measurement with multimeter
- Disconnect 3-pin plug from component X30/44 (Hybrid CAN potential distributor connector).
- Measure resistance with multimeter between socket (X30/44) 3 and ground (Kl. 31)
Specified value
- [< 5]ohms
Question:
- Is the measured value within the specified value range?
YES
Test procedure ground cable
Preconditions
- The measurement value is OK.
Further procedure
- Connect all electrical connectors at component X30/44 (Hybrid CAN potential distributor connector).
- Perform test 'Power supply' from the complete list of guided tests.
Continue with button "F2"
NO
Test procedure ground cable
Preconditions
- The measurement value is not OK.
Possible cause and remedy
- Connect all electrical connectors at component X30/44 (Hybrid CAN potential distributor connector).
- Check electrical lines and connectors for short circuit, open circuit, loose seating and damage using the appropriate wiring diagram.
End of test
NO
Total resistance of hybrid CAN bus
Preconditions
- The measurement value is not OK.
Possible cause and remedy
- X30/44 (Hybrid CAN potential distributor connector)
- Check electrical lines and connectors for short circuit, open circuit, loose seating and damage using the appropriate wiring diagram.
End of test
NO
Check component X30/44 (Hybrid CAN potential distributor connector).
REQUIREMENT
- At least one of the measured values is not o.k.
Additional measures
- Perform measurement at component X30/44 (Hybrid CAN potential distributor connector).
- Measure resistance with multimeter between pins ( X30/44 ) 1 and ( X30/44 ) 2
Adapter cable no. W220 589 00 99 38 may be used.Warning!Repeat measurement at all slots of the component.Specified value
- [55...65]ohms
Question
- Is the measured value within the specified value range?
YES
Check CAN lines of hybrid CAN bus.
Preconditions
- The measurement value is OK.
Test sequence
- Connect all electrical connectors at component X30/44 (Hybrid CAN potential distributor connector).
- Disconnect electrical connector at the affected control unit.
- Perform a resistance measurement of the CAN lines between the electrical connector of the control unit and component X30/44 (Hybrid CAN potential distributor connector).
Warning
- Perform measurement as per the current wiring diagram.
Specified value
- [55...65]ohms
Question
- Measured value o.k.?
YES
Check CAN lines of hybrid CAN bus.
Preconditions
- The measurement value is OK.
Further procedure
- Perform test 'Power supply' from the complete list of guided tests.
Continue with button "F2"
NO
Check CAN lines of hybrid CAN bus.
Preconditions
- The measurement value is not OK.
Possible cause and remedy
- Check electrical lines and connectors for short circuit, open circuit, loose seating and damage using the appropriate wiring diagram.
End of test
NO
Check component X30/44 (Hybrid CAN potential distributor connector).
Preconditions
- At least one of the measured values is not o.k.
Possible cause and remedy
- X30/44 (Hybrid CAN potential distributor connector)
Continue with button "F2"
Check CAN lines of hybrid CAN bus.
Preconditions
- Component X30/44 (Hybrid CAN potential distributor connector) was exchanged.
Test sequence
- Connect all electrical connectors at component X30/44 (Hybrid CAN potential distributor connector).
- Disconnect electrical connector at the affected control unit.
- Perform a resistance measurement of the CAN lines between the electrical connector of the control unit and component X30/44 (Hybrid CAN potential distributor connector).
Warning
- Perform measurement as per the current wiring diagram.
Specified value
- [55...65]ohms
Question
- Measured value o.k.?
YES
Check CAN lines of hybrid CAN bus.
Preconditions
- The measurement value is OK.
Further procedure
- Perform test 'Power supply' from the complete list of guided tests.
Continue with button "F2"
NO
Check CAN lines of hybrid CAN bus.
Preconditions
- The measurement value is not OK.
Possible cause and remedy
- Check electrical lines and connectors for short circuit, open circuit, loose seating and damage using the appropriate wiring diagram.
End of test