Introduction
The engine control system of the diavel is equipped with two absolute pressure sensors, with one connected to the intake duct of each cylinder (map 1 cylinder 1 - horizontal - map 2 cylinder 2 - vertical). They are used by the control unit to determine the quantity of fuel to be injected according to the speed-density strategy and to determine the atmospheric pressure (necessary information to correct the carburation in accordance with the altimetric measurement).
Components assembling position
The absolute pressure sensors of the vertical (1) and horizontal (2) cylinders are fixed near the airbox (the image shows also the position of the sensor connection).
Wiring diagram
O absolute pressure sensor 1, horizontal cylinder. Ccm engine control connection, 1 ground, black/purple - bk/v, 2 power (5v), brown/purple - bn/v, 3 signal generated, green/white - g/w.
V absolute pressure sensor 2 vertical cylinder. Ccm engine control connection, 1 ground, black/purple - bk/v, 2 power (5v), brown/purple - bn/v, 3 signal generated, green/white - g/w.
In the event of fault
In the event of a fault of absolute pressure sensor 1, the engine control unit uses the information from absolute pressure sensor 2 instead.
In the event of a fault of absolute pressure sensor 2, the engine control unit uses the information from absolute pressure sensor 1 instead.
In the event of a fault of both absolute pressure sensor 1 and absolute pressure sensor 2:
Fault codes generated and possible correlated faults
Fault codes generated by the engine control unit and displayed by the dds (maps 1 sensor diagnosis - maps 2 sensor diagnosis):
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 "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:
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.
Accelerator position sensor (throttle grip)
Introduction
An accelerator position sensor (aps) is mounted on the throttle body of the
diavel, which measures the degree of aperture
of the throttle grip.
The throttle grip is connected to the sensor via two metal cables
The sensor transmits information to the ecu relative to the "torque ...
Key-on/key-off using the key on the hands free lock with the passive key
Key-on can be performed by pressing the button (7) on the
hands free lock and with the presence of the passive key (4,
fig. 77).
Note
The passive key (4, fig. 77) Has a range of a few cm,
therefore the key (4, fig. 77) Must be positioned near the
antenna (2). Remove the seat (see "remova ...
Check engine oil level
Check the engine oil level through the sight glass (1) on the right-hand side
of the oil sump.
Stop the engine and allow a few minutes for the oil to settle to a steady level.
Oil level must be checked with the vehicle perfectly upright and the engine
cold.
The oil must be between the m ...