Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 1333
8–252 ELECTRICAL-BODY AND CHASSIS
Fuel Tank Unit Inspection
Measure the fuel tank unit resistance between the
connector terminals 1 F-1 and 3 F-1 while shifting the
float from “E” to “F” point.
Fuel Tank Resistance
A
1/2
F
B
C
E
Base
line
140RV003
Fuel Gauge Off-Vehicle Inspection
Use a circuit tester to measure the fuel gauge resistance.
Fuel Gauge Resistance
Ω
Standard
Measuring Point
With
Without
Tachometer
Tachometer
IGN (+) – Ground
223
110
IGN (+) – 7V
(0)
IGN (+) – UNIT
83
25
Ground – 7V
110
Ground – UNIT
140
135
7V – UNIT
25
Level
Float position
Standard resistance
mm
Ω
F (B)
51.7
17 ± 2.1
1/2 (A)
49.4
45 ± 4.5
E (C)
166.9
120 ± 6.5
+
−
1
W/O Tachometer
Unit
IGN
+
140RV007
ELECTRICAL-BODY AND CHASSIS 8–253
Low Fuel Indicator Light Inspection
1. Disconnect the fuel tank unit wire connector.
2. Connect between terminal (YL) and (B).
3. Turn the key switch on. Check that the bulb lights.
If operation is not correct, remove and check the bulb or
circuit.
2
+
B
YR
YL
1
140RV004
140RV010
Check level sensor operation
1. Remove the fuel tank unit.
2. Apply battery voltage between terminal (YL) and (B)
through a 3.4 watt bulb. Check that the bulb lights.
Note:
It will take a short time for the bulb light.
3. Submerge the sensor in fuel. Check that the bulb
goes out.
If operation is not correct, replace the fuel tank unit.
B
YL
Sensor
3.4 watt.
BRAKE SYSTEM WARNING LIGHT
The brake system warning light comes on while the
parking brake is set and the starter key is ON position.
Note:
The parking brake indicator light circuit is designed to
prevent driving of the vehicle with the parking brake on.
It does not indicate the condition of the parking brake
system.
The parking brake switch is in parallel with the brake fluid
switch.
This illustration is based on the floor type
parking brake lever
Parking brake lever
Parking brake switch
825RV066
The brake system warning light also comes on when
reservoir brake fluid level falls below the specified limit
with the parking brake released and the starter switch is
ON position.
Level mark
Max
Min
Max
Min
330RV001
8–254 ELECTRICAL-BODY AND CHASSIS
VEHICLE SPEED SENSOR (INCORPORATED IN
THE SPEEDOMETER)
Vehicle Speed Sensor Inspection
Remove the speedometer from the meter assembly and
measure the resistance value between the terminals.
Speed Sensor Resistance
Note: Use the analog type circuit tester.
SEN
4P
IGN
GND
825RV064
Tester
terminal
Red (+)
Black (–) Black (–)
Red (+)
Terminal
symbol
4P – GND
4P
GND
4P
GND
13.5 – 16.5k
∞
VEHICLE SPEED SENSOR (INSTALLED ON THE
TRANSMISSION)
The speed sensor is installed on the rear portion of the
transmission.
The number of pulses generated is four pulses per one
rotation of the pinion shaft.
Speed sensor
MSG T/M
(4
×2)
Speed sensor
MSG T/M
(4
×4)
826RV018
Speed sensor
MUA T/M
826RV044
ELECTRICAL-BODY AND CHASSIS 8–255
Vehicle Speed Sensor Inspection
1. Connect the vehicle speed sensor connector 1 M-10
0
(Diesel engine: 1 E-44 ) to the battery (+) terminal
and 2 M-10
0
(Diesel engine: 2 E-44 ) to the (–)
terminal.
2. Connect a resistance of 1.3K ohm to 5K ohm (1/4 W
or more) between connectors 1 M-10 (Diesel engine:
1 E-44
0
) and 3 M-10 (Diesel engine: 3 E-44 )
CAUTION:
Be extremely careful not to connect the battery (+)
terminal to the connector 3 M-10 (Diesel engine:
3 E-44 ).
This may damage the vehicle speed sensor.
3. Rotate the shaft of the vehicle speed sensor slowly
and measure the voltage at the both ends with a
digital tester.
The voltage, with one rotation of shaft fluctuates four
times in the following range: 10 to 14V — 2V or less.
–
+
1
2
3
Battery
820RV001
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