Isuzu N-Series. Service manual — part 1046
CAB AND CHASSIS ELECTRICAL 8-289
H-5
H-6, H-7, H-8
1
2
3
7
8
9
13
14 15
19
20 21
25
26 27
31
32 33
34
35
36
37
4
5
6
10
11 12
16
17 18
22
23 24
28
29 30
38
39 40
6
5
4
12
11 10
18
17 16
24
23 22
30
29 28
40
39 38
3
2
1
9
8
7
15
14 13
21
20 19
27
26 25
33
32 31
34
35
36
37
N8A5488E
1
2
1
2
1 2 3 4
5 6 7 8
9 10 11 12 13
14 15 16 17 18
2
1
2
1
4 3 2 1
8 7 6 5
13 12 11 10 9
18 17 16 15 14
H - 6
H - 7
H - 8
N8A5489E
8-290 CAB AND CHASSIS ELECTRICAL
Diagnosis
Quick Chart for Check Point
1. Speedometer
Notice:
Figure in parenthesis “( )” indicates the order of inspection.
2. Tachometer
Notice:
Figure in parenthesis “( )” indicates the order of inspection.
3. Coolant Temperature Gauge
Notice:
Figure in parenthesis “( )” indicates the order of inspection.
Check point
Speedometer
Vehicle speed
sensor
Cable harness
Trouble
mode
1-1. Speedometer and odometer do not func-
tion
❍
(3)
❍
(1)
❍
(2)
1-2. Speedometer does not function
(odometer is normal)
❍
(1)
1-3. Odometer does not function
(Speedometer is normal)
❍
(1)
1-4. Speedometer needle fluctuates
(May be wide fluctuation)
❍
(3)
❍
(1)
❍
(2)
1-5. Speedometer needle jumps erratically
❍
(3)
❍
(1)
❍
(2)
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)
CAB AND CHASSIS ELECTRICAL 8-291
4. Fuel Gauge
Notice:
Figure in parenthesis “( )” indicates the order of inspection.
5. Warning/indicator Light
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)
Check point
Light
bulb
Parking
brake
SW
Brake
fluid
SW
Oil
pressure
SW
Fuel
tank
unit
Vacuum
SW
4WD
SW
Sedim
enter
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 float in
the water sedimenter goes
up above the drain warn-
ing level, the indicator light
does not light up
❍
(2)
❍
(1)
❍
(3)
5-7. Even when the brake
fluid is lower than speci-
fied level, the level warn-
ing light does not light up
❍
(1)
❍
(2)
❍
(3)
5-8. Even when the vac-
uum tank is empty vac-
uum warning buzzer does
not sound
❍
(1)
❍
(2)
8-292 CAB AND CHASSIS ELECTRICAL
Notice:
Figure in parenthesis “( )” indicates the order of inspection.
1. Speedometer
1-1. Speedometer and Odometer Do Not Function
1-2. Speedometer Does Not Function (Odometer Is Normal)
• DOES THE VEHICLE SPEED SENSOR OUTPUT IN
NORMALLY?
• ARE THE CIRCUITS BETWEEN THE VEHICLE SPEED
SENSOR AND THE METER, AND THE FUSE ( F-16 10A)
AND THE GROUND NORMAL?
REPLACE THE VEHICLE SPEED SENSOR
YES
NO
YES
NO
REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT IN
THE CIRCUIT
REPLACE THE SPEEDOMETER
N8A0299E
REPLACE THE SPEEDOMETER ASSEMBLY
N8A0300E
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