Isuzu N-Series. Manual - part 1147

8-300 CAB AND CHASSIS ELECTRICAL

2. Tachometer

Notice:
Figure in parenthesis “( )” indicates the order of inspection.

3. Coolant Temperature Gauge

Notice:
Figure in parenthesis “( )” indicates the order of inspection.

4. Fuel Gauge

Notice:
Figure in parenthesis “( )” indicates the order of inspection.

Check point

Tachometer

Engine speed 

sensor

 Cable harness

Trouble
mode

2-1. Tachometer does not function

❍

(3)

❍

(1)

❍

(2)

2-2. Tachometer needle fluctuates
(May be wide fluctuation)

❍

(3)

❍

(1)

❍

(2)

2-3. Tachometer needle jumps erratically

❍

(3)

❍

(1)

❍

(2)

Check point

Meter 

ASM

Thermo 

meter

Thermo 

unit

Thermo 

seat

Cable 

harness

Trouble
mode

3-1. Coolant temperature gauge nee-
dle does not move

❍

(3)

❍

(4)

❍

(2)

❍

(1)

3-2. Coolant temperature gauge read-
ing is too low (or high)

❍

(4)

❍

(5)

❍

(3)

❍

(1)

❍

(2)

3-3. Needle overshoots (or goes up to
the “H” range)

❍

(3)

❍

(4)

❍

(1)

❍

(2)

Check point

Meter ASM

Fuel gauge

Fuel tank 

unit

Cable 

harness

Trouble
mode

4-1. Fuel gauge needle does not move

❍

(3)

❍

(4)

❍

(2)

❍

(1)

4-2. Even when the tank is filled up with fuel,
the needle does not reach “F”

❍

(3)

❍

(4)

❍

(2)

❍

(1)

4-3. When the tank is not full of fuel, the nee-
dle overshoots (or goes to “F”)

❍

(3)

❍

(4)

❍

(2)

❍

(1)

CAB AND CHASSIS ELECTRICAL 8-301

5. Warning/indicator Light

Notice:
Figure in parenthesis “( )” indicates the order of inspection.

Check point

Light 

bulb

Parking 

brake 

SW

Brake 

fluid 

SW

Oil 

pressure 

SW

Fuel 
tank 

unit

Vacuum 

SW

4WD 

SW

Sedi-

menter 

SW

Seat 

belt 
SW

Cable 

harness

Trouble
mode

5-1. When the parking
brake lever is pulled, the
indicator light does not
light up

❍

(2)

❍

(1)

❍

(3)

5-2. Even when the park-
ing brake lever is
released, the indicator
light does not go off

❍

(1)

❍

(2)

5-3. While the engine
operating, the oil pressure
warning light does not go
off

❍

(2)

❍

(1)

5-4. Even when the tank is
full with fuel, the fuel warn-
ing light lights up

❍

(1)

❍

(2)

5-5. Even when the tank is
empty, the low fuel warn-
ing light does not light up

❍

(1)

❍

(2)

❍

(3)

5-6. Even when the trans-
fer level is shifted to 4WD
position, the indicator light
does not light up

❍

(2)

❍

(1)

❍

(3)

5-7. Even when the float in
the water sedimenter goes
up above the drain warn-
ing level, the indicator light
does not light up

❍

(2)

❍

(1)

❍

(3)

5-8. Even when the brake
fluid is lower than speci-
fied level, the level warn-
ing light does not light up

❍

(1)

❍

(2)

❍

(3)

5-9. Even when the vac-
uum tank is empty vac-
uum warning buzzer does
not sound

❍

(1)

❍

(2)

8-302 CAB AND CHASSIS ELECTRICAL

1. Speedometer
1-1. Speedometer and Odometer Do Not Function

1-2. Speedometer Does Not Function (Odometer Is Normal)

N8A5362E

REPLACE THE SPEEDOMETER ASSEMBLY

N8A0300E

CAB AND CHASSIS ELECTRICAL 8-303

1-3. Odometer Does Not Function (Speedometer Is Normal)

1-4. Speedometer Needle Fluctuates (May Be Wide Fluctuation)

1-5. Speedometer Needle Jumps Erratically

REPLACE THE SPEEDOMETER ASSEMBLY

N8A0300E

N8A5366E

N8A5366E