Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 1229

8-256  ELECTRICAL-BODY AND CHASSIS 

 

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 

W

Standard

Measuring Point

With

Tachometer

Without

Tachometer

IGN (+) - Ground

130

-

IGN (+) - UNIT

82

-

UNIT - Ground

212

-

VOLTAGE
REGULATOR - UNIT

-

25

 

ELECTRICAL-BODY AND CHASSIS  8-257 

 

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. 

8-258  ELECTRICAL-BODY AND CHASSIS 

 

 
 

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 

W

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

 

ELECTRICAL-BODY AND CHASSIS  8-259 

 

 

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

W

F (B)

51.7

17 

± 2.1

1/2 (A)

49.4

45 

± 4.5

E (C)

166.9

120 

± 6.5