Isuzu N-Series. Manual — part 423

6E-28 EMISSION AND ELECTRICAL DIAGNOSIS

Legend

1. Data link connector (Left-hand drive)

3. Data link connector (Right-hand drive)

2. ECM including atmospheric

4. Intake air temp switch equipped with EGR and VSS

Legend

1. Engine coolant temperature sensor

5. Rock sensor

2. VSS

6. Engine speed sensor

3. EGR

* Equipped with EGR and VSS

4. Timing advance solenoid switch

N6A1140E

EMISSION AND ELECTRICAL DIAGNOSIS 6E-29

Parts Location

N6A1668E

6E-30 EMISSION AND ELECTRICAL DIAGNOSIS

Engine Control Module (ECM)

Appearance of ECM

Legend

1. ECM

A. Detail of 30 pins connector

2. Name plate

B. Detail of 22 pins connector

N6A1142E

EMISSION AND ELECTRICAL DIAGNOSIS 6E-31

Chart of Engine Control Module (ECM) Input/Output

Equipped

without

EGR and

VSS

Equipped with EGR and

VSS

Connector

Connector

number

Connector name

4HE1-XS

4HE1-XN

4HE1-XS

Connec-
tor 30 pin

1

Checker SIG (Serial Communication)

❍

❍

❍

2

Intake Temperature Switch

❍

❍

3

Engine Type

❍

4

Not be used

—

—

—

5

Transmission Type

6

Rack Sensor (+5V)

❍

❍

❍

7

Rack Sensor SIG

❍

❍

❍

8

Battery (+)

❍

❍

❍

9

Ignition Key

❍

❍

❍

10

Not be used

—

—

—

11

Timing Advance Solenoid Switch Relay

❍

❍

❍

12

Not be used

—

—

—

13

Electric Vacuum Regulating Valve Power
Supply

×

❍

❍

14

Electric Vacuum Regulating Valve GND

×

❍

❍

15

Checker GND

❍

❍

❍

16

Diag Control

❍

❍

❍

17

Not be used

—

—

—

18

Not be used

—

—

—

19

Not be used

—

—

—

20

Not be used

—

—

—

21

Rack Sensor GND

❍

❍

❍

22

ECM GND

❍

❍

❍

23

Not be used

—

—

—

24

Not be used

—

—

—

25

Not be used

—

—

—

26

Not be used

—

—

—

27

Transmission Position Switch

❍

28

Not be used

—

—

—

29

Not be used

—

—

—

30

FICD Magnetic Valve Power Supply

❍

❍

❍