Isuzu N-Series. Service manual — part 740
Engine Control System (4JH1) 6E-11
CKP Sensor, Engine Warm Up Switch and APP Sensor
Resistor
Engine
warm up
switch
signal
Low
reference
Shield
ground
Low
reference
Engine
warm up
switch
indicator
lamp
control
APP
sensor
signal
Idle
switch
signal
5V reference
ECM
ECM
101
1
2
B-340
B-340
69
24
98
B-233
49
B-234
18
H-5
2
J-183
1
J-183
J-183
3
12
H-5
90
B-233
0.5
RED
0.5
RED
0.5
WHT
0.5
WHT
CKP
Sensor
CKP
sensor
signal
5V reference
38
57
B-234
Idle
Switch
B-1
Frame
0.85
BLK
0.5
BLK/
GRN
0.5
BLK
0.5
GRN/
BLK
0.5
GRN/
ORN
0.5
RED/
GRN
0.5
GRN/
BLK
32
B-80
APP
Sensor
1
B-80
ECM
0.5
BLK
0.5
BLK
24
4
2
0.5
L
T
GRN/
RED
T
ail
Relay
1
B-31
0.5
BRN
5
B-31
3
6
ECM
Main Relay
46
59
0.5
BLU/
RED
0.3
BLK
0.5
BRN/
RED
0.5
BRN/
RED
Engine
W
arm Up
Switch
W/S-C
ECM
Main Relay
0.5
BRN/
RED
N6A3869E
6E-12 Engine Control System (4JH1)
MAF, IAT and ECT Sensors
N6A3870E
Low
reference
Low
reference
MAF
sensor
signal
IA
T
sensor
signal
5V reference
5V reference
ECT
sensor
signal
5V reference
93
B-233
1
J-182
2
4
5
29
H-5
16
H-14
11
H-14
37
H-5
H-8
1
2
0.5
BLK/
PNK
0.5
BLK/
PNK
0.5
BLK/
PNK
92
6
H-8
0.5
BLK/
RED
0.5
BLK/
RED
84
3
J-182
89
B-233
0.5
BLK/
BLU
0.5
BLK/
BLU
16
H-5
0.5
GR
Y
0.5
GR
Y
0.5
GR
Y
ECM
ECM
88
83
0.5
GRN/
RED
0.5
WHT/
RED
0.5
GRN/
RED
0.5
WHT/
RED
0.5
BLU/
RED
MAF & IA
T
Sensor
1
E-16
2
E-16
ECT
Sensor
0.5
BLK/
ORN
0.5
BLK/
ORN
0.5
BLU/
RED
2
1
J-105
J-105
EGR
Solenoid
V
alve
7
H-8
97
EGR
solenoid
valve
control
(PWM)
ECM
Main Relay
Engine Control System (4JH1) 6E-13
A/C and Glow Relay
A/C
Compressor
A/C ON
signal
relay
signal
Glow
relay
control
A/C
compressor
relay
control
Resistor
1
B-339
2
B-339
0.5
GRN/
YEL
0.5
GRN/
YEL
0.5
GRN/
YEL
0.5
BLK/
RED
0.5
BLK
2
5
X-26
X-26
A/C
Signal
Relay
3
BLK/
RED
0.3
BLK/
RED
5
2
X-20
Glow
Relay
Glow
Plug
0.85
GRN/
YEL
0.85
GRN/
YEL
0.5
WHT/
GRN
0.5
BLK
0.85
BLK
0.5
WHT/
GRN
2
5
X-24
X-24
A/C
Compressor
Relay
16
H-8
3
H-8
H-8
1
H-14
ECM
J-9
Frame
B-1
Frame
41
B-234
33
94
B-233
SBF-3
Glow
60A
4
3
X-20
1
J-122
15
4
1
4
1
Fuse & Relay Box
(Behind the Cab)
F-1
AIR CON
10A
SBF-25
HEATER
30A
0.5
BLU/
RED
0.5
GRN/
ORN
USW
JOINT2
W/S-C
0.5
PNK/
GRN
0.85
GRN/
WHT
1.25
L
T
GRN/
BLK
0.85
BRN
5
1
4
2
X-10
X-10
A/C
Thermo
Relay
0.5
BLU/
RED
3
H-18
J-6
J-6
12
Pressure
Switch
Diode
Electro
Thermo
4
H-18
0.5BLU/RED
2
BLU
1.25
BLU
ECM
Main Relay
1
H-6
Fuse &
Relay Box
(Glove Box)
Relay Box
(Instrument
Panel)
EGR Solenoid V
alve
PCU
Exhaust Brake
Solenoid V
alve
Intake Throttle
Solenoid V
alve
0.5
BLU /
RED
N6A3871E
6E-14 Engine Control System (4JH1)
EGR Solenoid Valve, Exhaust Brake Solenoid Valve, Intake Throttle Solenoid Valve, Exhaust Brake Switch,
Clutch Switch and Brake Switch
0.5
BLU/
RED
USW
JOINT2
3
BLU/
RED
0.5
YEL
0.5
WHT/
BLK
0.5
GRN
0.5
BLU/
RED
0.5
BLU/
RED
0.5
GRN/
YEL
0.5
GRN
4
1
3
2
B-66
Brake
Switch
2
1
8
7
6
3
1
2
B-89
B-89
Clutch
Switch
ECM
EHCU
(ABS
Module)
65
Stop
Light
F-5
ST
OP
LIGHT
10A
31
ECM
Main
Relay
Glow
Relay
1
H-6
30
0.5
L
T
GRN
0.5
BLK
2
1
J-31
J-31
40
0.5
L
T
GRN/
WHT
0.5
BLU/
RED
2
1
J-40
J-40
95
Intake
Throttle
Solenoid
V
alve
Exhaust
Brake
Solenoid
V
alve
MAF Sensor
EGR Solenoid V
alve
A/C Compressor Relay
A/C Signal Relay
9
32
H-5
0.5
L
T
GRN
0.5
L
T
GRN/
WHT
B-234
0.5
L
T
GRN/
BLU
0.5
BLU/
RED
2
1
B-69
B-69
Exhaust
Brake
Switch
64
IPC
12V
Brake
pedal
switch1
signal
Exhaust
brake
switch
signal
Clutch
switch
signal
Brake
pedal
switch2
signal
Intake
throttle
solenoid
valve
control
Exhaust
brake
solenoid
valve
control
Fuse &
Relay Box
(Glove Box)
J/C-E
PCU
Idle
Switch
Resistor
Engine
W
arm Up
Switch
8
7
10
1
1
H-14
0.5
L
T
GRN/
WHT
0.5
L
T
GRN/
WHT
0.5
L
T
GRN/
BLK
0.5
L
T
GRN/
BLK
62
32
B-234
J-177
0.5
L
T
GRN/
BLK
0.5
L
T
GRN/
WHT
36
40
H-5
12V
Exhaust
brake
cut
signal
input
Exhaust
brake
cut
signal
feedback
input
Exhaust
brake
cut
signal
feedback
output
Exhaust
brake
cut
signal
output
0.5
L
T
GRN/
BLU
12V
N6A3872E
Neutral
switch
signal
Resistor
B-342
B-342
0.3
BLK
0.5
BLK/
WHT
0.5
BLK/
WHT
0.5
BLK/
WHT
2
1
J-50
J-50
Neutral
Switch
9
H-8
87
B-233
W/S-C
0.5
BLU/
RED
1
2
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