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Ducati Diavel Service Manual: Dashes shown instead of speed indication or indicated speed is incorrect

Ducati Diavel Service Manual / Electric system and engine control system / Bbs and db faults / Dashes shown instead of speed indication or indicated speed is incorrect

Fault codes

Dds: speed sensor diagnosis -> max. Speed (max. Speed error - signal not correct) - minimum speed (min speed error - signal not correct) - congruence (correlation speed error - signal not correct).

Dashboard: the error "speed sensor" is shown on the service display. The eobd warning light activates.

Fault indication

If the dashboard does not receive "vehicle speed" information via the can line:

If:

Or

The error "speed sensor" is shown on the dashboard service display.

Warning

The dashboard speed indicator also displays fixed dashes if vehicle speed exceeds 299 km/h.

Warning

Dtc is disabled in the event of a wheel speed sensor erro

r.

Wiring diagram

Dashes shown instead of speed indication or indicated speed is incorrect


Bbs bbs unit connection, db dashboard connection, abs abs connection. Bbs 14 green/purple - g/v, db 9 blue - b.

Dashes shown instead of speed indication or indicated speed is incorrect


Pin numbering for wiring harness side dashboard connector.

Dashes shown instead of speed indication or indicated speed is incorrect


Pin numbering of wiring harness side bbs unit connection.

Checks

For diagnosing wheel speed sensors, consult the section relative to diagnosing the abs unit.

Check the integrity of the electrical circuit and connections (short-circuits to ground, short-circuits to vdc, open circuits).

If the above test did not identify the problem, 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.

Propagation of wheel speed signals and generation of vehicle speed signal

Propagation of wheel speed signals and generation of vehicle speed signal


The diagram illustrates how the vehicle speed information is generated and how it is transmitted to the dashboard.

Using the replicated rear wheel speed signal and the circumference of the wheel itself, the bbs unit calculates the vehicle speed (2 in diagram). This parameter is used by the ducati traction control (dtc) function together with the front wheel speed and the circumference of the front wheel itself, in order to implement engine torque limiting strategies when required.

The vehicle speed calculated by the bbs is transmitted over the can line (3 in diagram) and acquired by the dashboard, which displays the speed information accordingly.

Gear indicator display on dashboard shows dashes, engaged gear not displayed correctly, idle speed irregular with gearbox in neutral
Fault codes Dds: gear sensor diagnosis -> short circuit to ground or open circuit (s.C. Gnd or c.O.) - Short circuit to vdc (s.C. Vdc) - congruence (generic error - signal not correct). Dash ...

Abs fault indicator not working
Fault codes Dds: displays a fault code described in the description of the abs system. Dashboard: no fault code displayed. Wiring diagram Checks The abs fault indicator indicates the occurr ...

Other materials:

Active key
Introduction The active key (1) communicates with the hands free system by radio. In order to function, the key must be within a 1.5 Metre radius from the antenna (located in the document compartment under the seat). In the event of a flat key battery or of an internal transmitter circuit f ...

Residual range indication when the service is due
After resetting the first oil service warning (triggered at 1000 km), upon every key-on the system displays the indication of which type of service should be performed next (oil service or desmo service) and the residual range. A (green) warning (1, fig. 32) Is activated for 2 seconds on ever ...

Rectifier-regulator
The rectifier (1) is placed in the electrical components compartment. The rectifier/regulator consists of an aluminium casing containing the diodes that rectify the current produced by the alternator. It also contains an electronic device that regulates the current supplied by the alternator ...

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