Isuzu N-Series. Service manual — part 1097
8-100 CAB AND CHASSIS ELECTRICAL
4JH1 Engine (6)
12V
VSS
signal
Exhaust
brake
lamp
control
Glow
indicator
lamp
control
MIL
control
42
43
B-234
68
27
ECM
Instrument
Panel Cluster
(IPC)
MIL
Glow
3
1
J-32
VSS
Engine
speed
signal
output
4
B-51
6
8
0.5
GRN/
YEL
0.5
ORN/
BLU
0.5
BLU/
GRN
0.85
BLK
0.5
YEL/
GRN
0.5
BLK
0.85
BLK
2
BLK
0.5
YEL/
GRN
T
achometer
1
B-55
8
2
J-32
10
Speedometer
0.5
BLK/YEL
F-16
METER
10A
19
H-5
25
31
B-7
Headlight
Bracket
1
B-51
0.5
L
T
GRN/
BLU
Exhaust
Brake
Exhaust
Brake
Switch
60
0.5
GRN/
RED
2
B-52
3
0.5
BLK
0.85
BLK
9
B-1
Frame
0.3
BLK
Fuse & Relay Box
(Glove Box)
0.3
BLK/
YEL
0.3
BLK/
YEL
0.5
YEL/
GRN
N6A3868E
CAB AND CHASSIS ELECTRICAL 8-101
4JH1 Engine (7)
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
8-102 CAB AND CHASSIS ELECTRICAL
4JH1 Engine (8)
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
CAB AND CHASSIS ELECTRICAL 8-103
4JH1 Engine (9)
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
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