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.