APRILIA Tuono 125 Euro 4 User Manual

Cause of error
Open circuit or short circuit to positive: interruption of the circuit or excessive voltage at PIN 13 of the
control unit connector.
Short circuit to negative: null voltage between PIN 13 and 15 of the control unit connector.
Troubleshooting
Open circuit:
•
Disconnect the connector of the control unit.
•
Measure the resistance value of the sensor at different temperatures between PIN 13 and
15.
•
Disconnect the sensor connector.
•
Verify continuity of the wiring harness between the sensor connector and the control unit
connector: Control unit PIN 13 - sensor PIN 3 and control unit PIN 15 - sensor PIN 1. If
necessary, restore the wiring harness.
•
If the wiring harness is intact but the sensor resistance value is incorrect, this means that
the sensor is faulty and must be replaced, otherwise proceed with the checks.
Short-circuit to positive:
•
With the sensor connector and the control unit disconnected, verify that the fault is shorted
with the battery positive of sensor connector PIN 3 (or control unit connector PIN 13) and
restore the cabling.
Short circuit to negative:
•
Disconnect the sensor connector.
•
Check the sensor connector PIN 3 ground insulation.
•
If there is no ground insulation restore the wiring harness.
•
If PIN 3 is insulated from the ground and the error persists, this means that there is a probable
fault in the control unit.
Lambda sensor
Function
In charge of telling the control unit whether the
mixture is lean or rich.
Operation / Operating principle
Based on the difference of oxygen in the exhaust
fumes and the environment, this generates volt-
age which is read and interpreted by the injection
control unit. It does not require an external supply
source but, in order to work properly, it should
RS 125 - Tuono 125 - Euro 4 Electrical system
ELE SYS - 131

APRILIA Tuono 125 Euro 4 Specifications

General

Brand	APRILIA
Model	Tuono 125 Euro 4
Category	Motorcycle
Language	English