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