Diagnostic Instrument - VESPA 946 E4 EMEA 2021 Manual

Vespa 946 E4-E5 EMEA-USA-ASIA (2021-)
ABS GROUND
1. Ne - Ground

Diagnostic instrument

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 between
PIN 5 and 10 are involved.
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 (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).
Pin-out:
Electrical system
ELE SYS - 119