Function
To supply the correct amount of petrol at the right timing.
Operating principle
Injector coil is excited for the petrol passage to open.
Level in wiring diagram: Coils and injectors.
Location:
- on the vehicle: inside the filter casing
- connector: on injector
Electrical characteristics: 14.8 Ohm +/- 5% (at 20°C (68°F))
Pin-out:
- 1. Supply: "+"
- 2. Ground connection
Caution! Before carrying out any troubleshooting, carefully read the general troubleshooting concepts for electrical devices at the beginning of the check and control section in the electrical system chapter.
Axone: parameters
Front cylinder injection time
Rear cylinder injection time
Axone: activations
Front injector
The auxiliary injection relay (No. 42 in the wiring diagram, placed under fuel tank, right side, third relay starting from the front; CHECK, however, the identification of the relay with the colour of the cables) is energised for 5 seconds and the grey/green cable of the injector is closed to ground for 4 ms per second. Disconnect the 4-way connector of the fuel pump to be able to hear the relay and injector activation. The continuity of the wiring is necessary for correct activation: no error indications are displayed in case of lack of activation.
Rear injector
The auxiliary injection relay (No. 42 in the wiring diagram, placed under fuel tank, right side, third relay starting from the front; CHECK, however, the identification of the relay with the colour of the cables) is energised for 5 seconds and the grey/red cable of the injector is closed to ground for 4 ms per second. Disconnect the 4-way connector of the fuel pump to be able to hear the relay and injector activation. The continuity of the wiring is necessary for correct activation: no error indications are displayed in case of lack of activation.
Axone: electrical errors
Front cylinder injector P0201 - shorted to positive / shorted to negative / open circuit.
Error cause
If shorted to positive: excessive voltage has been detected at PIN 50 of the ENGINE connector.
If shorted to negative: no voltage has been detected.
If the circuit is open: an interruption has been detected.
Troubleshooting
if shorted to positive: disconnect the injector connector, set key to ON, activate the component with Axone and check the voltage on the grey/green cable on the filter casing small connector towards the Marelli control unit: if there is voltage, restore the cable harness between the filter casing connector and the Marelli control unit. If there is no voltage, reconnect the connector and check if there is voltage at PIN -: if there is voltage, restore the filter casing cable harness. If there is no voltage, replace the sensor.
if shorted to negative: disconnect the injector connector, set the key to ON and check if there is a ground connection on the grey/green cable: if there is voltage, restore the cable harness between the filter casing connector and the Marelli control unit; if there is no voltage, reconnect the connector and disconnect the injector connector and check if there is a ground connection on PIN -: if there is voltage, restore the filter casing cable harness. If there is no voltage, replace the injector.
the circuit is open: check the component correct electrical characteristic: if it is not correct, replace the component; if it is correct, check the filter casing small connector, the connector on the component and the Marelli control unit connector: If not OK, restore; if OK, check cable continuity between ENGINE PIN 50 and component PIN - and restore the cable harness.
Front cylinder injector P0202 - See front injector
Error cause
If shorted to positive: excessive voltage has been detected at PIN 34 of the ENGINE connector.
If shorted to negative: no voltage has been detected.
If the circuit is open: an interruption has been detected.
Troubleshooting
if shorted to positive: disconnect the injector connector, set key to ON, activate the component with Axone and check the voltage on the grey/green cable on the filter casing small connector towards the Marelli control unit: if there is voltage, restore the cable harness between the filter casing connector and the Marelli control unit. If there is no voltage, reconnect the connector and check if there is voltage at PIN -: if there is voltage, restore the filter casing cable harness. If there is no voltage, replace the sensor.
if shorted to negative: disconnect the injector connector, set the key to ON and check if there is a ground connection on the grey/red cable: if there is, restore the cable harness between the filter casing connector and the Marelli control unit; if there is not, reconnect the connector and disconnect the injector connector and check if there is a ground connection on PIN -: if there is voltage, restore the filter casing cable harness. If there is no voltage, replace the injector.
the circuit is open: check the component correct electrical characteristic: if it is not correct, replace the component; if it is correct, check the filter casing small connector, the connector on the component and the Marelli control unit connector: If not OK, restore. If OK, check cable continuity between the ENGINE PIN 34 and component PIN - and restore the cable harness.