Speedometer - APRILIA Atlantic 500 Workshop Manual

Electrical system

SPEEDOMETER

• Check the correct coupling of the speed sensor
connector (1).
• Check the correct coupling of the dashboard
connectors (2).
• Check the distance between the speed sensor (3)
and the screws (4) that fasten the front brake disc.
Distance between sensor (3) and screws (4): 1.5 ±
1 mm.
• Make sure that all screws (4) are fitted.
Carry out the following tests with the engine off and
the ignition switch in the " " position:
st
1 Test
• Without disconnecting the speed sensor connector
(1), connect a tester and measure the voltage
between the gray/blue (Gr/B) and blue/orange (B/
Ar) cables.
Correct value: > 9 V (c.c.).
2 nd Test
• Without disconnecting the speed sensor connector
(1), connect a tester and measure the voltage
between the gray/white (Gr/Bi) and blue/orange
(B/Ar) cables.
Correct value: > 6 V (c.c.).
rd
3 Test
• Place the vehicle on the rear support stand
nd
• Carry out the 2 test.
• Turn the front wheel by hand so that one of the
screws (4) is level with the sensor (3). The tester
reading will move to zero V for approximately 2
seconds before returning to > 6 V.
st
- If the 1 test shows an incorrect value, disconnect
the sensor (3) and repeat the test; if the value
remains incorrect, the dashboard is faulty and
must be replaced with a fully operational one.
- If the 1 st test shows a correct value but the 2
shows an incorrect value, the sensor (3) is faulty
and must be replaced.
st nd
- If the 1 and 2 test both show correct values but
the 3 rd test has an incorrect value, the sensor (3) is
faulty and must be replaced.
- If all three tests show correct values but the speed
still does not appear on the left dial on the dash-
board, the dashboard is faulty and must be re-
placed with a fully operational one.
chap. 6
1
nd test
Release 00
Atlantic 500
2
2002-09
6
2
6-29