Isuzu N-Series. Manual — part 1153
8-324 CAB AND CHASSIS ELECTRICAL
B-53 (With Smoother)
B-51
*1: With Smoother
*2: Without Smoother
B-52
Terminal No.
Connected to
1
TCM
2
—
3
—
4
—
5
—
6
1st Start
7
ECONO
8
Smoother
9
—
10
—
11
—
12
—
Terminal No.
Connected to
1
Turn LH
2
Beam
3
—
4
Brake (*1) / — (*2)
5
Check Engine (*1) / Brake (*2)
6
Exhaust Brake
7
—
8
—
9
Brake Booster
10
Charge
11
Oil Pressure
12
ABS
13
— (*1) / Check Engine (*2)
14
—
15
Ground
16
Vehicle Speed Signal Output
17
Illumination +
18
Ignition
19
Rear Fog
20
ASR
Terminal No.
Connected to
1
4WD
2
—
3
Turn RH
4
—
5
Thermal
6
Fuel
7
TAM Pulse (
−)
8
TAM Pulse (+)
9
—
10
Sedimenter
11
Front Fog
12
—
13
—
14
—
15
Glow
16
Battery
17
Vehicle Speed Sensor
18
—
19
—
20
Ground
Terminal No.
Connected to
1
Battery
2
—
3
Ground
CAB AND CHASSIS ELECTRICAL 8-325
Removal
Preparation:
Disconnect the battery ground cable.
1. Meter Cluster
2. Meter Assembly
Remove the five screws.
Disconnect the meter connectors.
Installation
To install, follow the removal steps in the reverse order.
Speedometer
The speedometer is made up of the cross coil type am-
meter (movement) that displays indications, the stepper
motor that drives and adds up the odometer and trip
meter, and the driving circuit (printed circuit board) that
makes exchanges between the pulse signals and the
current.
N8A0325E
N8A0326E
N8A0327E
TRIP
ODO
A
B
km/h
0
20
40
60
80 100
120
140
160
N8A0328E
8-326 CAB AND CHASSIS ELECTRICAL
On-vehicle Service
Check the meter display accuracy and the operation of
the odometer with the speedometer tester.
Notice:
Inappropriate tire inflation may affect the accuracy of the
odometer.
(To conduct this test, refer to the tester manufacturer's
instruction manual.)
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 ser-
vice.
Except 4HK1-TC
For 4HK1-TC (General Export)
For 4HK1-TC (Europe)
Individual Inspection
Remove the speedometer from the meter assembly and
measure the resistance and the current consumption
between each terminals.
Replace the speedometer when the result of inspection
is found abnormal.
Removal
Preparation:
Disconnect the battery ground cable.
Tester display speed
Meter display
permissible level
20 km/h
17.5 — 22.5 km/h
40
37.5 — 42.5
60
57.5 — 62.5
80
77.5 — 82.5
100
97.6 — 103.4
120
117.6 — 123.4
140
137.6 — 143.4
Tester display speed
Meter display
permissible level
20 MPH
18.3 — 21.7 MPH
40
38.3 — 41.7
60
58.3 — 61.7
80
77.8 — 82.8
TRIP
ODO
A
B
MPH
0
10
20
30
40
50 60
70
80
90
100
N8A0330E
Tester display speed
Meter display
permissible level
40 km/h
37 — 41 km/h
60
58 — 62
80
77.5 — 82.5
100
97.5 — 103
120
117 — 122.5
140
137.5 — 143
Tester display speed
Meter display
permissible level
20 km/h
20 — 22.5 km/h
40
40 — 42.5
60
60 — 63.2
80
79.7 — 83.4
Terminal symbol
Resistance value
IGN — GND
58
±20 kΩ
SEN — GND
70
±20 kΩ
4P — GND
∞
IGN
GND
SENSOR
B
4 Pulse output
N8A0332E
CAB AND CHASSIS ELECTRICAL 8-327
• 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.
Except 4HK1-TC
N8A0333E
N8A0485E
Tester display speed
Meter display
permissible level
500
400 — 500
1000
800 — 1050
2000
1800 — 2050
3000
2800 — 3050
4000
3800 — 4050
N8A0334E
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