Diagnostic Instrument - VESPA GTS Super 125 i.e. Service Station Manual

Vespa GTS Super 125 i.e.
FUEL LEVEL TRANSMITTER CONNECTOR
1. Fuel level indicator (White - Green)
2. Ground lead (Black)
3.Low fuel warning light (Yellow-Green)
COOLANT PUMP CONNECTOR
1. Ground lead (Black)
2. Injection load relay (Black-Green)
3. Injection load relay (Black-Green)

Diagnostic instrument

THE FOLLOWING INFORMATION REFER TO THE VERSION EQUIPPED WITH MIU G3 ECU.
STARTER COMMAND
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 are
involved with Pin 10.
ELECTRICAL ERRORS
Starter command P0170 - shorted to positive.
Error cause
Short circuit to positive: excessive voltage at PIN 10 of the control unit connector.
Troubleshooting
Short circuit to positive:
- This malfunction is detected with a brake activated and the starter button pressed.
- 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).
THE FOLLOWING INFORMATION REFER TO THE VERSION EQUIPPED WITH MIU G3 ECU.
Electrical system
ELE SYS - 107