Checking The Fuel Injector; Checking The Condition Of The Coolant Thermistor - APRILIA Atlantic 500 Workshop Manual

Electrical system

CHECKING THE FUEL INJECTOR

With the engine off:
• Disconnect the two-way connector (black) (1) and
carry out the relevant measurements (on the
injector-side terminals).
Use a tester (scale x 100 Ω) to measure the
•
resistance between the fuel injector-side termi-
nals.
Standard value: 14.5 ± 10% Ω Ω Ω Ω Ω at 45°F (25°C)
If resistance is infinite (∞) or lower than the pre-
scribed value, the injector (2) must be replaced.
CHECKING THE CONDITION OF THE COOLANT
THERMISTOR
• Remove the thermistor (1), see (REMOVING THE
COOLANT THERMISTOR).
• Connect a tester (2) (set as an ohmmeter) to the
thermistor (1), as shown in the figure.
• Immerse the thermistor (1) in a container (3) filled
with coolant.
• Immerse a thermometer (4) with a range of 32-
302°F (0-150°C) in the same container.
• Place the container on a burner (5) and heat the
coolant slowly.
• Check the temperature shown by the thermometer
(4) and the value of the thermistor (1), as shown
on the tester.
Make sure that the value varies according to tempera-
ture, as indicated.
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 (1).
• Repeat these operations for the other thermistor.
Temperature
A1 - A2 (Ω)
°F (°C)
557 ±10%
140 (60)
196 ±10%
194 (90)
80.6 ±10%
248 (120)
6-14
B1 - B2 (Ω)
576 ±10%
231 ±10%
105 ±10%
Release 00 2002-09
2
A1
A2
chap. 6
Atlantic 500
1
1
B1
B2