Aprilia Consumer Service Spa
Technical Service and Training
Release 4 july 99
This material is didactic and
may be changed following the technical
development of the product
CHECK 11: SPEEDOMETER CHECK:
- Check the connections
WITH THE ENGINE OFF:
1) With the key ON, measure the voltage between the green/purple and blue/orange
wires without disconnecting the connectors. The reading should be more than 9 Volts
dc.
2) Measure the voltage between the grey/white and blue/orange wires without
disconnecting the connectors. The reading should be more than 6 Volts dc.
3) Starting from test 2, turn the wheel so that a screw comes on to the sensor; at that
moment the voltage should go to zero for about 2 sec. and then back to 6 Volts.
If test 1 doesn’t give the above results => dashboard defective
If test 1 is correct but test 2 wrong => sensor defective
If test s1 and 2 are correct but test 3 wrong => sensor defective
If test s1, 2 and 3 are correct but the speed isn’t shown on the dashboard =>
dashboard defective
CHECK 12: TACHOMETER CHECK:
Check that there is voltage between the green and blue/green wires with the key ON
Check the continuity (tester in ohmic scale) on the grey/purple wire between the
dashboard and the ECU
Try changing the dashboard with one you are sure that works
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