Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 1228

8-252 ELECTRICAL-BODY AND CHASSIS

W/O Tachometer

MPH meter

MPH

Indication

Permissible Range

20

18.2-21.8

40

38.2-41.8

60

58.2-61.8

80

78.2-82.8

100

98.5-103.1

W/ Tachometer

MPH meter

MPH

Indication

Permissible Range

20

18.5-21.5

40

38.5-41.5

60

58.5-61.5

80

79.1-82.5

100

98.9-102.7

ELECTRICAL-BODY AND CHASSIS 8-253

Speedometer Off-Vehicle Inspection

Tachometer On-Vehicle Inspection

1. Attach a tune-up tester to the engine.
2. Start the engine.
3. Compare the tachometer reading and the tester reading.
If the tachometer indication is outside the permissible

range, the tachometer must be replaced.

4. Gradually increase and decrease the engine speed.

Note the movement of the tachometer needle.

If the needle movement is sluggish, the tachometer must be
replaced.

Gasoline engine

rpm

Indication

Permissible Range

1,000

940-1060

2,000

1875-2125

3,000

2850-3150

4,000

3820-4180

5,000

4820-5180

6,000

5820-6180

8-254 ELECTRICAL-BODY AND CHASSIS

Gasoline engine (6VD1)

Gasoline engine (6VD1)

rpm

Indication

Permissible Range

1,000

900-1060

2,000

1820-2070

3,000

2820-3120

4,000

3820-4180

5,000

4820-5180

6,000

5820-6180

7,000

6820-7180

Diesel engine

Diesel engine

rpm

Indication

Permissible Range

750

690-810

2,000

1875-2125

3,000

2850-3150

4,000

3820-4180

5,000

4820-5180

Tachometer Off-Vehicle Inspection

Remove the tachometer from the meter assembly and
measure the resistance value and the current consumption
between each terminal.

Tachometer Resistance

Tester

Terminal

terminal

symbol

Red (+) Black (-) Black (-) Red (+)

IGN

GND

IGN

GND

¥

23 - 31k

P

GND

P

GND

28.8 - 35.2k

¥

P - GND

IGN - GND

Note: Use the analog type circuit tester (range:

´ 1k).

Tachometer Current Consumption

Terminal

symbol

Current

consumption

Remarks

IGN - GND

+

-

90

± 15mA

(12

± 1V when

voltage applied)

No signal input

Note: 1. Use the analog type circuit tester.

2. Since the current consumption fluctuates as the

source voltage varies, check to be sure that the

ELECTRICAL-BODY AND CHASSIS 8-255

voltage applied is 12V

± 1V.