Isuzu N-Series. Service 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
❍
❍
❍
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