VESPA 946 E4 EMEA 2021 Manual page 122

Electrical system
Short-circuit to positive: excessive voltage at PIN 31 of the control unit connector.
Short circuit to negative: lack of insulation from ground on the sensor connector PIN 1.
Open circuit: circuit interruption.
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 2 (corresponding to control
unit connector PIN 31); if there is a short, restore the wiring harness.
Open circuit:
- Disconnect the control unit connector and the sensor connector.
- Check the continuity of the wiring harness between the sensor connector and control unit connector:
control unit PIN 31 - sensor PIN 2. If necessary, restore the wiring harness.
- Verify continuity of the cabling between the sensor connector and the injection relay: sensor PIN 1 -
injection relay PIN 3. 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.
- Check the sensor connector PIN 2 ground insulation. If there is no insulation, restore the wiring har-
ness.
- If PIN 2 is insulated from ground and in the absence of other errors (fuel pump, injector, coil), this
means that the control unit is most likely faulty.
INJECTOR
Function
Provide the correct amount of fuel at the correct
time.
Operation / Operating principle
Injector coil is excited for the petrol passage to
open.
Pin-out:
1. Power via relay
2. Control unit ground
ELECTRICAL ERRORS
Injector P0201 - short circuit to positive / short circuit to negative / open circuit.
Cause of error
Short-circuit to positive: excessive voltage to PIN 34 of the control unit connector.
Short-circuit to negative: zero voltage to the PIN 1 of the injector connector.
Open circuit: circuit interruption.
ELE SYS - 122
Vespa 946 E4-E5 EMEA-USA-ASIA (2021-)