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Isuzu N-Series. Manual - part 1154
8-328 CAB AND CHASSIS ELECTRICAL
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
750
700 — 800
2000
1900 — 2150
3000
2950 — 3200
4000
3950 — 4200
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
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
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
N0A0337E