Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 1398

ELECTRICAL-BODY AND CHASSIS 8-157

TEMPERATURE GAUGE AND THERMO

UNIT

Temperature Gauge On-Vehicle Inspection

1. Disconnect the temperature gauge wire connector.

2. Connect a 3.4 Watt test bulb

1

to the ground.

The gauge needle should move the middle part of the

gauge

Temperature Gauge Off-Vehicle Inspection

Use a circuit tester to measure the temperature gauge
resistance.
Temperature Gauge Resistance

Ω

Standard

Measuring Point

With

Tachometer

Without

Tachometer

IGN (+) - Ground

130

-

IGN (+) - UNIT

82

-

UNIT - Ground

212

-

VOLTAGE

REGULATOR - UNIT

-

25

8-158 ELECTRICAL-BODY AND CHASSIS

Thermo Unit Inspection

The thermo unit is thermistor type and must be inspected
under the conditions as shown in the left chart.
1. Put the deviation of the galvanometer to 0 by using the

variable resistor, switch the thermo unit off and then

measure the resistance of the resistor through the bridge.

Confirm that the resistance is continuously variable in any

other points than those shown in the following table.

2. Dip the thermo unit into 80 - 90

°C (176 - 194°F) water and

confirm that there is no bubble continuously coming out of

inside of the unit.

Replace the unit when the result of inspection is found

abnormal.

Temperature

Check

condition

50

°C

(122

°F)

115

°C

(239

°F)

7V 55

Ω

Gauge

Resistance

+33.6

226.0

-36.6

+1.71

26.4

-2.21

7V 25

Ω

Gauge

value (

Ω)

-

+2.68

24.3

-3.68

ELECTRICAL-BODY AND CHASSIS 8-159

FUEL GAUGE AND TANK UNIT

Fuel gauge On-Vehicle Inspection

1. Disconnect the fuel gauge wire connector.

2. Connect a 3.4 Watt test bulb

1

to the ground.

The gauge needle should more the middle part of the

gauge.

Fuel Gauge Off-Vehicle Inspection

Use a circuit tester to measure the fuel gauge resistance.
Fuel Gauge Resistance

Ω

Standard

Measuring Point

With

Tachometer

Without

Tachometer

IGN (+) - Ground

223

110

IGN (+) - 7V

(0)

IGN (+) - UNIT

83

25

Ground - 7V

110

Ground - UNIT

140

135

7V - UNIT

25

8-160 ELECTRICAL-BODY AND CHASSIS

Fuel Tank Unit Inspection

Measure the fuel tank unit resistance between the connector
terminals 1

F-1

and 3

F-1

while shifting the float from “E”

to “F” point.

Fuel Tank Resistance

Level

Float position

mm

Standard resistance

Ω

F (B)

51.7

17

± 2.1

1/2 (A)

49.4

45

± 4.5

E (C)

166.9

120

± 6.5