Isuzu N-Series. Manual — part 1053
CAB AND CHASSIS ELECTRICAL 8-317
• Except 4HK1-TC
1. Meter Assembly
Refer to “METER ASSEMBLY” in this section.
2. Meter Glass
Remove it by pushing the catches with your finger.
3. Speedometer
Remove four screws securing the meter at the
back side.
• For 4HK1-TC
1. Remove the meter assembly/speedometer (1).
Notice:
Speedometer cannot be removed as a single unit since
it is integrated into the meter assembly.
• Refer to “Meter Assembly” in this section.
2. Remove the meter plate (2) and meter glass (3).
• Remove the two installing screws on the meter
surface.
• Remove the meter plate by pushing the catch-
es with your finger.
Installation
To install, follow the removal steps in the reverse order.
Tachometer
The tachometer is made up of the cross coil type amme-
ter (movement) that displays indications, and the drive
circuit (printed board) that makes exchange between
the pulse signals and the current.
On-vehicle Service Inspection
1. Set up the tune-up tester to the engine.
2. Start the engine and compare the readings dis-
played by the tachometer and the tester.
When the difference between these two readings
differs largely from the specified value, replace it
with a correct one.
Notice:
Since the meter display permissible levels above are
specifications solely for the meter, they are to be used
as reference values when conducting on-vehicle inspec-
tion.
N8A0333E
N8A0485E
N8A0334E
8-318 CAB AND CHASSIS ELECTRICAL
Except 4HK1-TC
For 4HK1-TC
Individual Inspection
Remove the tachometer from the meter assembly and
measure the resistance value and the current consump-
tion between each terminals.
Replace the tachometer when the result of inspection is
found abnormal.
1. Resistance value
Use the analog type circuit tester. (Range: 1K)
For 12 Volt tachometer
For 24 Volt tachometer
2. Current value
Use the analog type circuit tester.
Since the current consumption fluctuates as the power
voltage varies, check to be sure that the voltage applied
is 12
±1 V or 24±1 V.
Removal
Preparation:
Disconnect the battery ground cable.
• Except 4HK1-TC
1. Meter Assembly
Refer to “METER ASSEMBLY” in this section.
2. Meter Glass
Remove it by pushing the catches with your finger.
3. Tachometer
Remove three screws securing the meter at the
back side.
Tester display speed
Meter display
permissible level
500
400 — 500
1000
800 — 1050
2000
1800 — 2050
3000
2800 — 3050
4000
3800 — 4050
Tester display speed
Meter display
permissible level
750
700 — 800
2000
1900 — 2150
3000
2950 — 3200
4000
3950 — 4200
N8A0336E
Terminal
symbol
Tester terminal
Red
(+)
Black
(
−)
Black
(
−)
Red
(+)
IGN — GND
IGN
GND
IGN
GND
∞
30
±5 kΩ
PIN — GND
PIN
GND
PIN
GND
33
±5 kΩ
500 — 1000 k
Ω
Terminal
symbol
Tester terminal
Red
(+)
Black
(
−)
Black
(
−)
Red
(+)
IGN — GND
IGN
GND
IGN
GND
∞
30
±5 kΩ
PIN — GND
PIN
GND
PIN
GND
33
±5 kΩ
500 — 1000 k
Ω
Voltage
Connecting
terminal
Current
consumption
Remarks
12Volt
IGN — GND
12
±1 V
(when 12
±1 V
applied)
No signal
input
24Volt
24
±1 V
(when 24
±1 V
applied)
No signal
input
CAB AND CHASSIS ELECTRICAL 8-319
• For 4HK1-TC
1. Remove the meter assembly/tachometer (1).
Notice:
Tachometer cannot be removed as a single unit since it
is integrated into the meter assembly.
• Refer to “Meter Assembly” in this section.
2. Remove the meter plate (2) and meter glass (3).
• Remove the two installing screws on the meter
surface.
• Remove the meter plate by pushing the catch-
es with your finger.
Installation
To install, follow the removal steps in the reverse order.
Coolant Temperature Gauge
Circuit Diagram
Inspection
Remove the coolant temperature gauge from the meter
assembly, and measure the resistance value between
each terminal.
Replace the coolant temperature gauge when the result
of inspection is found abnormal.
N8A0337E
N8A0485E
+
IGN
GND
UNIT
Thermo unit
Engine coolant temperature gauge
-
N8A0338E
8-320 CAB AND CHASSIS ELECTRICAL
Removal
Preparation:
Disconnect the battery ground cable.
• Except 4HK1-TC
1. Meter Assembly
Refer to “METER ASSEMBLY” in this section.
2. Meter Glass
Remove it by pushing the catches with your finger.
3. Coolant Temperature Gauge
Remove six screws securing the meter at the back
side.
• For 4HK1-TC
1. Remove the meter assembly (1).
Notice:
Coolant temperature gauge and fuel gauge cannot be
removed as a single unit since they are integrated into
the meter assembly.
• Refer to “Meter Assembly” in this section.
2. Remove the meter plate (2) and meter glass (3).
• Remove the two installing screws on the meter
surface.
• Remove the meter plate by pushing the catch-
es with your finger.
Installation
To install, follow the removal steps in the reverse order.
Terminal symbol
Resistance value
IG — U
169
Ω±10%
U — E
333
Ω±10%
IG — E
242
Ω±10%
N8A0339E
N8A0340E
N8A0485E
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