MOTO GUZZI NEVADA Service Station Manual page 90

Electrical system
•
Disconnect the sensor connector and the control unit connector.
•
Check the sensor connector PIN 1 ground insulation. In the absence of insulation restore
the cabling.
•
Check the sensor connector PIN 2 ground insulation. In the absence of insulation restore
the cabling.
•
If PIN 1 and PIN 2 are insulated from the ground and the error persists, this means that there
is a probable fault in the control unit.
Lambda probe heater P0135 - shorted to positive / shorted to negative / open circuit.
Error cause
Shorted to positive: excessive voltage at PIN 2 of the control unit connector.
Shorted to negative: lack of insulation from ground on the sensor connector PIN 4.
The circuit is open: interruption of the circuit.
Troubleshooting
Shorted to positive:
•
Disconnect the control unit connector and the sensor connector.
•
Verify that there is no short to battery positive on sensor connector PIN 3 (corresponding to
control unit connector PIN 2); if there is a short, restore the cabling.
The circuit is open:
•
Disconnect the control unit connector and the sensor connector.
•
Verify continuity of the cabling between the sensor connector and the control unit connector:
Control unit PIN 2 - sensor PIN 3. Restore the cabling if necessary.
•
Verify continuity of the cabling between the sensor connector and the injection relay: sensor
PIN 4 - injection relay PIN 3. Restore the cabling if necessary.
•
If the cabling is intact and the error persists, proceed with the following checks.
Shorted to negative:
•
Disconnect the sensor connector.
•
Check the sensor connector PIN 3 ground insulation. In the absence of insulation restore
the cabling.
•
If PIN 3 is insulated from ground and in the absence of other errors (fuel pump, injector, coil),
this means that the control unit is most likely faulty.
ELE SYS - 90
NEVADA - NEVADA ANNIVERSARIO