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Electrical system
•
between PIN 26 and 27 of the instrument panel: approximately 120 Ohm
Pin out:
•
Line L: white/black cable between Marelli control unit PIN 66 and the black-bodied connector
PIN 27 of the instrument panel.
•
Line H: orange cable between Marelli control unit PIN 80 and the black-bodied connector
PIN 26 of the instrument panel.
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.
DIAGNOSIS 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 the cable harness; if OK, check that the two
lines are not shorted to positive testing each of the 3 connectors (Marelli control unit, engine-
vehicle cable harness connector and instrument panel connector) with 1 connector discon-
nected at a time and by setting the key to ON: If not OK, restore; if OK, replace the Marelli
control unit.
CAN line towards instrument panel U1701
•
no signal.
Error cause
ELE SYS - 244
RSV4 Factory a-PRC
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