Checking The Fuel Pump; Checking The Condition Of The Air Thermistor - APRILIA Atlantic 500 Workshop Manual

Electrical system

CHECKING THE FUEL PUMP

• Energize terminals 1 and 4 of the pump connector
with 12 V DC.
• Check that the pump operates, emitting its charac-
teristic buzzing sound, and check that the supply
pressure on the pressure gauge reaches at least
150 KPa (1.5 bars).
CAUTION
Respect pump polarity.
CHECKING THE CONDITION OF THE AIR THER-
MISTOR
CAUTION
On reassembly, make sure that the electrical
connector (1) is correctly coupled.
• Remove the thermistor (2).
• Connect a tester (3) (set as an ohmmeter) to the
thermistor (2), as shown in the figure.
• Immerse the thermistor in a container (4) filled
with water.
• Immerse a thermometer (5) with a range of 32-
302°F (0-150°C) in the same container.
• Place the container on a burner (6) and heat the
water slowly.
• Check the temperature shown by the thermometer
(5) and the value of the thermistor (1), as shown
on the tester.
Make sure that the value varies according to the
temperature, as indicated.
Temperature °F (°C)
32 (0)
50 (10)
68 (20)
86 (30)
NOTE
If, as the temperature changes, the standard
values do not change or are greatly different from the
values shown in the table, replace the thermistor (2).
chap. 6
Resistance Ω Ω Ω Ω Ω
9750
5970
3740
2410
Release 00
Atlantic 500
(direct current)
2
1
2002-09
6
6-15