Oxygen Sensors - Ducati Diavel Workshop Manual

Introduction to the engine control system
The dashboard service display shows the error "Pressure" 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). Check:
- That the sensors are connected securely to the intake ducts and check the integrity of the pipe.
- That valve clearance is correct.
- Cylinder compression.
- That there is no anomalous air infiltration into the intake duct.
The DDS may be used to read the absolute pressure value within the two intake ducts.
If none of the aforementioned tests identify the problem and the absolute pressure sensors are in proper working order,
replace the engine control unit.
Component replacement methods
No special measures are necessary in order to replace absolute pressure sensor 1 and absolute pressure sensor 2, (check
integrity of the rubber pipes via which they are connected to the two intake ducts). After replacing one or both of the
pressure sensors, reset the self-adaptive parameters relative to carburation with the DDS.

Oxygen sensors

Introduction
An ON-OFF type oxygen sensor (in normal operating conditions, the voltage generated by the sensors switches between a
value close to 1V and a value close to 0V) is mounted on each of the exhaust manifold of the Diavel.
Each oxygen sensor has its own internal heater, which receives 12V and has a ground connection controlled by the engine
control unit with a PWM (Pulse Width Modulation) signal.
Example of a PWM signal used by the engine control unit to control the oxygen sensor heater. While the signal period is
constant, the duration of the part of the signal at 0V (ground) changes, varying the time during which the heater remains
electrically powered (if the ground period is close to the signal period, the heater functions continuously, if the ground
period is short, the heater functions in short intervals, whereas if the ground period is zero, the heater is not functional).
Component assembling position