Function
Radiator fan and coolant - Operation.
Operating principle
When the control unit detects a temperature of approx. 102°C, it closes the fan control relay pickup circuit to ground.
Level in wiring diagram: electric fan
Location: the relay is located under the fuel tank, left side, first front relay (CHECK, however, the identification of the relay with the colour of the cables).
Electrical characteristics:
- relay normally open;
- drive coil resistance 110 Ohm (+/- 10 %)
Axone: statuses
Fan relay
Example value: on/off
Axone: activations
Fan
The fan relay (No. 44 in the wiring diagram, placed under fuel tank, left side, first front relay; CHECK, however, the identification of the relay with the colour of the cables) is energised for 10 seconds. The continuity of the wiring is necessary for correct activation: no error indications are displayed in case of lack of activation.
Axone: electrical errors
Cooling fan relay P0480 - shorted to positive / shorted to negative / open circuit.
Error cause
If shorted to positive: excessive voltage has been detected at PIN 54 of the VEHICLE connector.
If shorted to negative: short circuit to ground detected.
If the circuit is open: interrupted circuit detected. Excessive voltage can only be detected after the fan relay gets activated.
Troubleshooting
If shorted to positive: check the relay electrical specifications are correct by disconnecting it from the cable harness. If they are not correct, replace the relay; if correct, restore the cable harness (pink/blue cable).
If shorted to negative: check the relay electrical specifications are correct by disconnecting it from the cable harness. If they are not correct, replace the relay; if correct, restore the cable harness (pink/blue cable).
If the circuit is open: check the relay connector and the Marelli control unit VEHICLE connector: If not OK, restore; if OK, restore the cable harness (red/blue cable).