MOTO GUZZI 2Q000297 Service Station Manual page 122

Electrical system
•
Check the sensor connector PIN 2 ground insulation. In the absence of insulation restore
the wiring harness.
•
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 P0155 - short circuit to positive / open circuit / short circuit to negative.
Error cause
•
Short-circuit to positive: excessive voltage at PIN 2 of the control unit connector.
•
Short-circuit to negative: lack of insulation from ground on the sensor connector PIN 4
•
Open circuit: circuit interruption.
Troubleshooting
Short-circuit 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 wiring harness.
Open circuit:
•
Disconnect the control unit connector and the sensor connector.
•
Verify continuity of the wiring harness between the sensor connector and the control unit
connector: Control unit PIN 2 - sensor PIN 3. If necessary, restore the wiring harness.
•
Verify continuity of the wiring harness between the sensor connector and the injection relay:
sensor PIN 4 - injection relay PIN 3. If necessary, restore the wiring harness.
•
If the wiring harness is intact and the error persists, proceed with the following checks.
Short-circuit to negative:
•
Disconnect the sensor connector.
•
Check the sensor connector PIN 3 ground insulation. In the absence of insulation restore
the wiring harness.
•
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.
LEFT LAMBDA
Level in electrical circuit diagram
Lambda probe
Position
•
Sensor: left exhaust pipe
•
Connector: adjacent to the filter box,
left side
Electrical specifications:
ELE SYS - 122
V7 III ABS