Function
Commands engine starting through the injection control unit.
Operation / Operating principle
The starter button, the brake switches, the starter command relay and the injection control unit between
PIN 5 and 10 are involved.
ELECTRICAL ERRORS
Starter command P0170 - shorted to positive.
Error cause
Shorted to positive: excessive voltage at PIN 10 of the control unit connector.
Troubleshooting
Shorted to positive:
- This malfunction is detected with a brake activated and the starter button pressed (voltage of 12V read
at PIN 5)
- If the battery voltage does not drop (thanks to the absorption of the starter command relay excitation
coil) the control unit understands that PIN 10 is shorted to battery.
- Restore the cabling (if the short is in the cabling) or the relay (if the short is in the relay).
ENGINE TEMPERATURE SENSOR
Function
Serves the purpose of communicating the engine
temperature to the control unit in order to optimise
performance.
Operation / Operating principle
NTC type sensor (resistance sensor, inversely
variable with temperature).
Pinout:
1. Injection ECU
2. Ground from control unit
Engine temperature sensor P0115 - open circuit or shorted to positive / shorted to negative.
Error cause
Open circuit or shorted to positive: interruption of the circuit or excessive voltage at PIN 13 of the control
unit connector. Shorted 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.
Vespa LX - S 125 3V ie 150 3V ie (2012) Electrical system
ELE SYS - 103
To Next Page
Loading...
Need help?
General
