Ducati Diavel
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Ducati Diavel Service Manual: Radiator fan relay


The radiator fans are powered via a specific relay, which is enabled by the engine control unit.

Component assembling position

Radiator fan relay

A injection relay; b etv relay (throttle valve actuator motor), c radiator fan relay, d engine control unit.

Radiator fan relay

Location of right hand fan connection.

Radiator fan relay

Location of left hand fan connection.

Connection wiring diagram

Connection wiring diagram

Ccm engine control connection, t radiator fan relay, a key on power (+15 from hands free relay 30), r battery power (+30), l left hand fan, r right hand fan, 85 light blue/black - lb/bk, 30 red/green - r/g, 86 red/black - r/bk, 87 red/grey - r/gr.

In the event of fault

In the event of a radiator fan relay fault, the radiator fans themselves do not work. The relay is not commanded by the ecu.

Fault codes generated and possible correlated faults fault codes generated by the engine control unit and displayed by the dds (fan relay diagnosis):


Check integrity of electric circuit - short-circuit to vdc = with dashboard on, using a voltmeter, a voltage is measured between the wire tested and ground.

Check integrity of electric circuit - short-circuit to ground = with the battery cables disconnected, using an ohmmeter, continuity is detected between the wire tested and ground.

Check integrity of electric circuit - open circuit = with the battery cables disconnected, using an ohmmeter, no continuity is detected between the two ends of the wire tested.

The dashboard service display shows the error "fan relay" and the eobd warning light activates.

Possible correlated faults: coolant reaches boiling point but radiator fans not working. Check:

The radiator fan relay may be actuated from the dds to check radiator fan function.

The fans are normally activated at 103 and switched off at 101C.

If none of the aforementioned tests identify the problem and the radiator fan relay is in proper working order, replace the engine control unit.

Component replacement methods

No special measures are necessary in order to replace the radiator fan relay.

Starter motor relay
Introduction When the rider presses the start button, with all the safety conditions required to enable engine start met, the engine control unit enables the relay that activates the starter motor ...

Engine speed-timing sensor
Introduction The engine control system of the diavel is equipped with an inductive sensor that allows the ecu to determine the speed and timing phase of the engine. The sensor faces a phonic wheel ...

Other materials:

Removing the timing belt driveshaft pulleys
Use the tool code 88713.1805 To hold the driving pulley on the engine crankcase against rotation. Important If this operation is carried out with the engine installed in the frame, hold the driveshaft pulleys against rotation using the tool code 88713.2011 Mounted on the alternator cover. Lo ...

Indicator speed avg - average speed
This function shows the average speed of the motorcycle. The calculation is made considering the distance and time travelled since the last trip 1 reset. When trip 1 is reset, the value is set to zero and the first available value is shown on the display 10 seconds after the reset. Dashes &quo ...

Spark plugs replacement
Check the colour of the ceramic insulation around the central electrode: an even, light brown colour indicates the engine is in good condition and running at the right temperature. Inspect the centre electrode for wear and check spark plug gap, which should be: 0.8+/-0.1 Mm. Important ...

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