Isuzu N-Series. Service manual — part 1099
8-108 CAB AND CHASSIS ELECTRICAL
4HK1-TC Engine (4)
2
BLK
0.5BLK
3
WHT/
RED
0.5
BLU/
BLK
0.5
BLU/
BLK
0.5
BLU/
BLK
0.5
YEL/
BLU
0.5
YEL/
BLU
2
RED
2
RED
2
RED
ECM
J-191
1.25
RED
24
18
H-5
J-9
Frame
2
4
3
X-18
ECM Main
Relay
X-18
5
SBF-5
ECM
40A
F-28
ECM
10A
21
2
40
5
Battery voltage
Fuse &
Relay Box
(Glove Box)
F-9
ENG. (IG)
10A
Fuse &
Relay Box
(Behind the Cab)
Fuse &
Relay Box
(Behind the Cab)
Relay Box
(Instrument
Panel)
ECM main
relay control
Ignition voltage
USW JOINT
3
Exhaust Brake Solenoid Valve
Starter Cut Relay
Intake Throttle Solenoid Valve
N6A6631E
SBF-2
KEY
40A
3
BLK/
YEL
1
2
ST
ON
ACC
OFF
B-67
3
B-67
Ignition
Switch
B-67
3
WHT/
BLU
3
WHT/
BLU
CAB AND CHASSIS ELECTRICAL 8-109
4HK1-TC Engine (5)
13
11
12
0.5
GRY
0.3
BLK/
WHT
0.3 BLK/WHT
0.3 BLK/WHT
HSA C/U
EHCU
(ABS Module)
TCM
HSA C/U
TCM
SRS C/U
0.3 LT BLU
0.3 LT BLU
0.3
WHT/
GRN
2
0.3
WHT/
BLK
0.5
LT BLU
1
52
38
0.5
YEL
0.5
YEL
7
0.5
LT BLU
0.5
BLK
Data
Link
Connector
(DLC)
ECM
Diagnostic
request
switch
Keyword
2000
0.5
BLK
1.25
BLK
1.25
BLK
4
Ground
5
B-79
Ground
20
H-4
4
1.25
BLK
3
1.25
BLK
1
0.75
BLK
62
0.75
BLK
43
0.5
BLK
81
J-191
9
B-1
Frame
2
BLK
J-9
Frame
Case
ground
3
1
2
USW
JOINT
3
J/C-G
19
22
18
21
J/C-B
W/S-C
Signal
ground
Signal
ground
Power
ground
Power
ground
Power
ground
Diagnostic
request
(SRS)
Diagnostic
request
(ECM)
Diagnostic
request
(TCM or HSA)
Diagnostic
(EHCU)
Class 2
serial
communication
(EHCU)
Keyword
serial
communication
(ECM, TCM or
HSA & SRS)
N6A6632E
8-110 CAB AND CHASSIS ELECTRICAL
4HK1-TC Engine (6)
18
B-51
0.5
BLU/
RED
0.5
BLU/
RED
0.5
ORN/
BLU
0.5
BLU/
PNK
0.5
ORN/
BLU
0.5
BLU/
PNK
Parking
Brake
Switch
ECM
Engine
speed
signal
output
VSS
signal
MIL
control
Glow
indicator
lamp
control
Exhaust
brake
lamp
control
Parking
brake
switch
signal
12
H-5
13
5
0.3WHT/VIO
0.3
WHT/
VIO
0.3
WHT/
RED
0.3WHT/VIO
5
B-51
B-51
3
4
10
3
5
H-12
H-12
15
6
B-51
B-52
B-51
B-51
4
10
B-51
0.5BRN
0.5
BLK
0.5
BLK/YEL
0.5
BLK/
YEL
0.5
BLK/
YEL
0.5
BLK/
YEL
0.5 YEL/GRN
0.5
YEL/
GRN
0.5
YEL/
GRN
0.3
YEL/
GRN
0.3
L
T
GRN
0.3
BLK/
YEL
0.5
BLK
0.5
BLK
1.25
BLK
0.3
WHT/BLK
0.3
WHT/BLK
WITH
HBB
W/O
HBB
Parking
Brake
Exhaust
Brake
Glow
MIL
M/T
M/T
Smoother
Smoother
0.5
WHT/
BLK
0.5
WHT/
BLK
0.5
WHT/
RED
0.3
WHT/
RED
0.5
WHT/BLK
0.5
WHT/BLU
Instrument
Panel
Cluster
(IPC)
Charge
Charge
Relay
Buzzer
Relay
Short
Connector
8
H-5
M/T
Smoother
HBB
Level
Switch
Diode Box
2
J-32
17
7
19
H-5
40
24
31
H-5
25
H-5
3
H-8
7
11
6
8
19
1
48
J-191
H-5
J-191
1
N-6
3
J-128
9
X-33
8
7
X-33
4
1
J-128
2
3
J-32
1
+B
B-1
Frame
F-16
METER
10A
Fuse &
Relay Box
(Glove Box)
T
achometer
Speedometer
0.3
L
T
GRN
8
B-52
HSA
C/U
Engine coolant
temperature gauge
7
H-14
23
H-5
4
B-55
0.5
L
T
BLU
0.5
L
T
BLU
0.5
L
T
BLU
0.5
GRN/
YEL
0.5
BLK
ECM
2
E-90
1
E-90
3
W/S-C
W/S-M
12
14
13
J/C-B
J-9
Frame
N6A6633E
ECM
VSS
ECT
Sensor
CAB AND CHASSIS ELECTRICAL 8-111
4HK1-TC Engine (7)
ECM
0.5
RED
0.5
BLU
0.5
BLU/
WHT
0.5RED
0.5WHT
0.5
WHT
0.5
RED
0.5
WHT
0.5
BLU/
RED
0.5
PNK/
BLK
0.3
BLK
0.5BLK
0.5
BLK
0.5
BLK
61
64
14
4
13
12
42
63
3
10
11
1
H-4
H-4
60
39
41
20
J-191
B-280
APP
sensor 1
signal
APP
sensor 2
signal
Low reference
Low reference
Shield ground
Shield ground
5V reference 2
ECM
5
B-280
5V reference 1
3
1
APP
Sensor 2
2
6
4
APP
Sensor 1
N6A6657E
J-191
0.5
RED
0.5
BRN
0.5
BLU
0.5
BLU/
YEL
0.5
RED
0.5
PNK/
BLK
0.5
BLU/
RED
0.5
PNK/
BLK
70
66
3
1
1
3
Idle
Up
Sensor
2
2
1
3
PT
O
Throttle
Sensor
2
J-166
B-281
H-4
J-166
B-281
H-4
PT
O
throttle
sensor
signal
Idle up
sensor
signal
0.5
PNK/
BLK
BARO
Sensor
IA
T
Sensor
BARO
Sensor
IA
T
Sensor
0.5
BLK
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