Specifications

Electrical system

chap. 6

6-15

Release 00 2002-09

Atlantic 500

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).

Respect pump polarity.

CAUTION

CHECKING THE CONDITION OF THE AIR THER-

MISTOR

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.

CAUTION

Temperature °F (°C)

32 (0) 9750

50 (10) 5970

68 (20) 3740

86 (30) 2410

Resistance

ΩΩ

Ω

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).

(direct current)