Ducati Diavel Service Manual: 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:

• The error is not indicated on the service display.
• The speed indicator on the dashboard displays fixed dashes.

If:

• Dtc is enabled and the abs detects an error on at least one wheel speed sensor (abs fault indicator light lit and abs disabled).

Or

• An error occurs on at least one wheel speed sensor with no abs.

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

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

Pin numbering for wiring harness side dashboard connector.

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 - 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

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.