Isuzu N-Series. Service 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