Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 1332
8–248 ELECTRICAL-BODY AND CHASSIS
Tachometer On-Vehicle Inspection
1. Attach a tune-up tester to the engine.
2. Start the engine.
3. Compare the tachometer reading and the tester
reading.
If the tachometer indication is outside the permis-
sible range, the tachometer must be replaced.
4.
Gradually increase and decrease the engine speed.
Note the movement of the tachometer needle.
If the needle movement is sluggish, the tachometer
must be replaced.
Indication
Permissible Range
1,000
940–1060
2,000
1875–2125
3,000
2850–3150
4,000
3820–4180
5,000
4820–5180
6,000
5820–6180
Gasoline engine
rpm
821RV121
Indication
Permissible Range
750
690–810
2,000
1875–2125
3,000
2850–3150
4,000
3820–4180
5,000
4820–5180
Diesel engine
rpm
821RV118
Gasoline engine
Indication
Permissible Range
1,000
900–1060
2,000
1820–2070
3,000
2820–3120
4,000
3820–4180
5,000
4820–5180
6,000
5820–6180
7,000
6820–7180
Gasoline engine (6VD1)
rpm
825RW256
Gasoline engine (6VD1)
Diesel engine
ELECTRICAL-BODY AND CHASSIS 8–249
Tachometer Resistance
Note: Use the analog type circuit tester (range: x 1k).
Tester
terminal
Red (+)
Black (–) Black (–)
Red (+)
Terminal
symbol
IGN – GND
IGN
GND
IGN
GND
∞
23 – 31k
P
– GND
P
GND
P
GND
∞
24.7 – 33.4k
Tachometer Current Consumption
Note: 1. Use the analog type circuit tester.
2. Since the current consumption fluctuates as
the source voltage varies, check to be sure that
the voltage applied is 12V ± 1V.
Terminal Current Remarks
symbol
consumption
90 ± 15 mA
(12 ± 1V when
No signal input
voltage applied)
IGN – GND
,
.
Tachometer Off-Vehicle Inspection
Remove the tachometer from the meter assembly and
measure the resistance value and the current
consumption between each terminal.
P
IGN
GND
821RV117
8–250 ELECTRICAL-BODY AND CHASSIS
TEMPERATURE GAUGE AND THERMO UNIT
W/O Tachometer
W/Tachometer
826RV041
Temperature Gauge On-Vehicle Inspection
1.
Disconnect the temperature gauge wire connector.
2.
Connect a 3.4 Watt test bulb 1 to the ground.
The gauge needle should move the middle part of
the gauge
+
−
1
W/Tachometer
Unit
Ground
IGN
+
140RV006
+
−
1
Voltage
regulator
W/O Tachometer
Unit
140RV005
Temperature Gauge Off-Vehicle Inspection
Use a circuit tester to measure the temperature gauge
resistance.
Temperature Gauge Resistance
Ω
Standard
Measuring Point
With
Without
Tachometer
Tachometer
IGN (+) – Ground
130
–
IGN (+) – UNIT
82
–
UNIT – Ground
212
–
VOLTAGE
REGULATOR – UNIT
–
25
ELECTRICAL-BODY AND CHASSIS 8–251
Thermo Unit Inspection
The thermo unit is thermistor type and must be inspected
under the conditions as shown in the left chart.
1. Put the deviation of the galvanometer to 0 by using
the variable resistor, switch the thermo unit off and
then measure the resistance of the resistor through
the bridge.
Confirm that the resistance is continuously variable
in any other points than those shown in the
following table.
2. Dip the thermo unit into 80 – 90°C (176 – 194°F) water
and confirm that there is no bubble continuously
coming out of inside of the unit.
Replace the unit when the result of inspection is
found abnormal.
A
GA
Bridge
Variable resistor
Switch
Galvano
meter
55
Ω or 25Ω (Including
resistance of ammeter)
Ammeter
DC
7.0V
825RV112
FUEL GAUGE AND TANK UNIT
W/O Tachometer
W/Tachometer
826RV042
Fuel Gauge On-Vehicle Inspection
1. Disconnect the fuel gauge wire connector.
2. Connect a 3.4 Watt test bulb 1 to the ground.
The gauge needle should more the middle part of the
gauge.
+
−
1
W/Tachometer
Unit
Ground
IGN
+
140RV006
Temperature
50°C
115°C
Check
(122°F)
(239°F)
condition
7V 55
Ω
226.0
+33.6
26.4
+1.71
Gauge
226.0
–36.6
26.4
–2.21
7V 25
Ω
26.4
+2.68
Gauge
—
24.3
–3.68
Resistance
value
(
Ω
)
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