Ducati Diavel Workshop Manual page 308

Introduction to the engine control system
CCM engine control connection, S air temperature sensor. 1 green/blue – G/B, 2 black/purple – Bk/V.
In the event of fault
In the event of an air temperature sensor fault, the engine control unit implements a recovery value of 25°C.
Fault codes generated and possible correlated faults
Fault codes generated by the engine control unit and displayed by the DDS (Intake air temperature sensor diagnosis):
- Short circuit to Vdc: check integrity of electric circuit and electrical connections.
- Short circuit to ground: check integrity of electric circuit and electrical connections.
- Open circuit: check integrity of electric circuit and electrical connections.
Note
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 "Air temperature" and the EOBD warning light activates.
Possible correlated faults: inadequate engine power, irregular idle speed (target idle speed is 1350 rpm with engine
stabilised at operating temperature), the engine does not start easily. Check:
- Sensor resistance, which must be approximately 2 kOhm at 25 °C.
The air temperature value may be checked using the DDS. Check that the value given is plausible.
If none of the aforementioned tests identify the problem and the air temperature sensor is in proper working order,
replace the engine control unit.
Component replacement methods
No special measures are necessary in order to replace the air temperature sensor.
Engine temperature sensor
Introduction
The engine control system on the Diavel uses a sensor that measures the temperature of the coolant (engine
temperature). This sensor has a resistance of NTC type (Negative Temperature Coefficient), that reduces its own value
when the temperature increases. The engine temperature sensor, allows the control unit to manage correctly the cold
starting and the heating phases.
Components assembling position