VESPA 946 E4 EMEA 2021 Manual page 123

Vespa 946 E4-E5 EMEA-USA-ASIA (2021-)
Electrical system
Troubleshooting
Short-circuit to positive:
- Disconnect the injector connector, turn ignition switch to ON and activate the component using the
diagnostic tool.
- Verify the absence of voltage at the injector connector PIN 2; if present restore the wiring harness,
otherwise proceed with the following checks.
Short-circuit to negative:
- Disconnect the injector connector, turn ignition switch to ON and activate the component using the
diagnostic tool.
- Verify the presence of voltage at the ends of the injector connector; if there is no voltage, restore the
wiring harness, otherwise proceed with the following checks.
Open circuit:
- Perform the check of the injector and control unit connectors.
- Verify continuity of the wiring harness between the control unit connector and the injector connector
(control unit PIN 34 - injector PIN 2). If there is no continuity, restore the wiring harness.
FUEL PUMP
ELECTRICAL ERRORS
Fuel pump relay P0230 - short-circuit to positive / short-circuit to negative / open circuit.
Error cause
Short-circuit to positive: excessive voltage at PIN 22 of the control unit connector.
Short circuit to negative: null voltage at PIN 85 of the injection relay.
Open circuit: circuit interruption.
Troubleshooting
Short-circuit to positive:
- Disconnect the injection relay, turn the key to ON and activate the relay through the diagnostic tool.
- Verify the presence of voltage between relay connector PIN 86 and 85 toward the cabling.
- If no voltage is read, disconnect the control unit and verify insulation from battery positive of the relay
PIN 86 (or control unit PIN 22). If necessary, restore the wiring harness.
Short circuit to negative:
- Disconnect the injection relay and the control unit.
- Verify ground insulation of the relay connector PIN 86 and 85 toward the cabling: if there is no insu-
lation, restore the wiring harness.
Open circuit:
- Disconnect the injection relay and the control unit.
- Verify continuity of the cabling between the relay and control unit: Relay PIN 86 - control unit PIN 22.
If necessary, restore the wiring harness.
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