Ducati Diavel Service Manual: 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 demand" made by the rider by twisting the throttle grip.
- For safety reasons, the sensor contains two potentiometers (a main potentiometer - main - and a secondary potentiometer - sub) with independent 5v power and ground.
Component assembling position
The accelerator position sensor is mounted on the throttle body and is held in place by two screws.
Location of accelerator position sensor connection.
Connection wiring diagram
Ccm engine control connection, s accelerator position sensor.
Main potentiometer (p): c orange signal - o, b supply (5v) brown/red - bn/r, a ground black/orange - bk/o.
Secondary potentiometer (s): f signal, green/black - g/bk, h supply (5v) brown/black - bn/b, g ground, black/white bk/w.
The two central pins d and e of the aps connector are not connected.
In the event of fault
In the event of an accelerator position sensor fault, the ecu disables the ride-by-wire system and the engine will not start, remains running at idle or stops.
Fault codes generated and possible correlated faults
Fault codes generated by the engine control unit and displayed by the dds (accelerator position 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.
- Incorrect electrical characteristics: check integrity of electric circuit and electrical connections. If the above measures do not resolve the fault, contact ducati.
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 "accelerator position" and the eobd warning light activates.
Possible correlated faults: inadequate engine power, incorrect idle speed (target idle speed is 1350 rpm with engine stabilised at operating temperature).
Check:
- That the metal cables operating the roller connected to the accelerator position sensor are correctly adjusted so that the roller can reach both the fully closed (throttle grip released) and fully open (throttle grip fully twisted) positions.
Throttle grip aperture may be checked using the dds.
If none of the tests described above identify the problem and the accelerator position sensor is in proper working order, contact ducati.
Component replacement methods
The aps sensor cannot be replaced individually. In case of fault it will not be necessary to replace the whole throttle body (see "operating principle and characteristics of the ride-by-wire system" of this section).
Correctly adjust the cables connecting the throttle grip to the throttle grip position sensor
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 ...
Throttle valve position sensor
Introduction
The throttle valve position sensor (tps) of the diavel is mounted on the
throttle body.
The sensor is integrated into the throttle valve actuator motor, which
turns the spindle ...
Other materials:
Trip 2 meter
This function shows the distance travelled since the trip
meter was last reset (in km or miles depending on the
specific application).
Holding the button (1, fig. 14) ?
pressed for 3 seconds
when this function is displayed resets the trip meter.
When the reading exceeds 9999.9, Distance t ...
Checking the camshafts and supports
Check the cam contact surfaces for scratches, grooves, steps and waving.
Worn cams are frequently the cause of poor timing, which leads to loss of engine
power.
Place the camshaft between two centres and check the run-out on the areas
indicated using two dial gauges.
Service limit: 0.1 ...
Tips on how to select the sensitivity level
Warning
The 8 level settings of the dtc were calibrated using
tyres of the same make, model and size as those originally
fitted to the motorcycle.
The use of tyres of different size to the original tyres may
alter the operating characteristics of the system.
In the case of minor differenc ...