MOTO GUZZI B043157 Service Station Manual page 164

Electrical system
Every network nod receives all the messages sent through the BUS (with reception confirmation or error
messages) and each nod decides if the message is to be processed or rejected. Besides, every nod
can request information from the other nodes (RTR = Remote Transmit Request).
Level in electrical circuit diagram:
CAN line
Electrical specifications:
•
between PIN 66 and 80 of the control unit: approximately 130 Ohm
•
between PIN 10 and 19 of the instrument panel: approximately 120 Ohm
Pin out:
•
Line L: cable X1 between Marelli control unit PIN 66 and instrument panel black body con-
nector PIN 10.
•
Line H: cable X2 between Marelli control unit PIN 80 and instrument panel black body con-
nector PIN 19.
CAUTION
BEFORE CARRYING OUT ANY TROUBLESHOOTING, CAREFULLY READ THE GENERAL TROU-
BLESHOOTING CONCEPTS FOR ELECTRICAL DEVICES AT THE BEGINNING OF THE CHECK
AND CONTROL SECTION IN THE ELECTRICAL SYSTEM CHAPTER.
DIAGNOSTICS INSTRUMENT: ELECTRICAL ERRORS
CAN line "Mute Node" U1601
•
Mute Node.
Error cause
•
The injection ECU cannot send CAN signals; it receives signals from the instrument panel:
the control unit may need replacing.
Troubleshooting
•
Replace the Marelli control unit.
CAN line without signals U1602
•
Bus Off.
Error cause
•
No communication on CAN line (PIN 66 and/or PIN 80): problem on the whole network (for
example, battery cut-off or short circuited or shorted to ground).
Troubleshooting
•
check the Marelli control unit VEHICLE connector and the engine-vehicle cable harness
connector: if not OK, restore; if OK, check the ground insulation of the two CAN lines from
PIN 66 and PIN 80 of the VEHICLE connector: if not OK, restore cable harness; if OK, check
the continuity of the two CAN lines from Marelli control unit VEHICLE connector to the in-
strument panel connector: if not OK restore cabling, if OK check that the two lines are not
ELE SYS - 164
Moto Guzzi California 1400