MOTO GUZZI V7 E5 Special-Stone Service Station Manual page 134

Electrical system
Diagnostic tool - Activation
•
Lambda probe heater 2
Diagnostic tool - Electrical errors
Control of the air-fuel ratio / Right lambda probe P0150 - positive short circuit / open circuit, short
circuit to negative / signal not valid.
Error cause
•
Short-circuit to positive: excessive voltage at PIN 18 or PIN 12 of the control unit connector.
•
Open circuit or short-circuit to negative: interruption of the circuit or null voltage between
control unit connector PIN 18 and 12
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 1 (corresponding to
control unit connector PIN 18); if there is a short, restore the wiring harness.
•
Verify that there is no short to battery positive on sensor connector PIN 2 (corresponding to
control unit connector PIN 12); 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 18 - sensor PIN 1 and control unit PIN 12 - sensor PIN 2. 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 and the control unit connector.
•
Check the sensor connector PIN 1 ground insulation. In the absence of insulation restore
the wiring harness.
•
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:
ELE SYS - 134
V7 E5 Special-Stone