Isuzu N-Series. Service manual — part 887
Transmission Control System (Smoother) 7A-3
Schematic and Routing Diagrams
Transmission Controls Schematics
Power Distribution
8WHT/BLK
8BLK
2L
J-26
B
SBF-8
60A
SBF-4
40A
Battery
P-1
P-2
P-3
P-4
P-5
ST
AR
TER
Starter
HEAD
LAMP
SBF-5
ECM
40A
Fuse & Relay Box
(Behind the Cab)
SBF-3
60A
GLOW
SBF-2
40A
KEY
SW
SBF-9
40A
ABS
SBF-7
60A
NEES
SBF-6
60A
CERAMIC
HEA
TER
SBF-1
MAIN
100A
or
120A
3
WHT/
BLU
F-21
10A
F-9
3
BLK/
YEL
3BLK/YEL
F-16
10A
F-17
NEES (IG)
10A
F-18
10A
Fuse &
Relay Box
(Glove Box)
ENG. (IG)
10A
ABS (IG)
METER
SRS
F-22
10A
ST
AR
TER
3
WHT/
BLU
5
WHT/
BLK
5
WHT/
BLK
8
WHT/
BLK
1.25
RED
0.5BLU/BLK
0.5
BLK
3
WHT/
BLK
J-9
Frame
3
WHT/
GRN
2
RED
Main
Relay
4
2
5
3
X-18
X-18
F-28
ECM
10A
Fuse &
Relay Box
(Cab Side)
ECM
ECM
Fuse & Relay Box
(Behind the Cab)
Fuse &
Relay Box
(Glove Box)
F-4
15A
AUDIO(B)
DOOR LOCK
F-13
NEES (B)
10A
F-5
F-6
10A
POWER
WINDOW
10A
ST
OP
LIGHT
W/S-I/-J
W/S-H
W/S-H
3BLK/YEL
ON Relay
H-6
1
Ignition
Switch
2
ST
ON
ACC
OFF
B-67
3
4
B-67
USW JOINT3
0.5BLK
N7A2131E
7A-4 Transmission Control System (Smoother)
Starting System
ECM
TCM
30 BLK/RED
8 BLK
8 BLK
8 BLK
3 BLK/YEL
P-1
P-2
P-3
P-4
Battery
P-5
3
BLK/
WHT
3
WHT/
BLK
0.5
RED/WHT
0.5
RED/WHT
0.5
RED
0.5
WHT/
BLU
0.3
BLK/WHT
3
WHT/
BLU
3
WHT/
BLU
2L
SBF-8
ST
AR
TER
60A
SBF-2
KEY
40A
F-22
ST
AR
TER
10A
14
H-8
0.5
RED/
WHT
0.5
WHT/
BLU
0.5
WHT/
BLU
J-9
Frame
4
B-67
USW
JOINT
3
2
BLK
0.5
BLK
14
J-191
B-425
46
Start cut
relay
control
Start
switch
signal
38
H-5
16
Starter
cut
relay
control
Fuse &
Relay Box
(Glove Box)
F-28
ECM
10A
Fuse &
Relay Box
(Behind the Cab)
Fuse &
Relay Box
(Behind the Cab)
Fuse &
Relay Box
(Behind the Cab)
2
3
J/C-2
0.85
L
T
GRN
0.5
L
T
GRN
ECM
Main Relay
5
2
X-21
Starter
Relay
4
3
X-21
5
1
X-26
Starter Cut
Relay
3
4
X-26
ST
ON
ACC
OFF
Ignition
Switch
Starter
B
C
1
J-27
1
J-26
F-16
10A
METER
0.5
BLK/
YEL
0.5
BLK/
YEL
0.5
BLK/
YEL
14
H-12
Emergency
Switch
5
1
N-17
N-17
W/S-M
0.3
BLU/
RED
0.3
BLU/
RED
0.3
BLK
0.3
BLK
W/S-E
0.3
BLK
B-7
Headlight
Bracket
Smoother
Emergency
Relay
1
X-14
3
Relay Box
(Instrument Panel)
0.3BLU/RED
4
B-428
14
4
H-12
Emergency
switch
signal
1
H-7
2
B-67
2
5
X-14
N7A2144E
Transmission Control System (Smoother) 7A-5
ECM and TCM Power
N7A2132E
0.5
WHT/
VIO
0.5
GRN/
WHT
1.25
GRN/
WHT
1.25
GRN/
WHT
TCM
Fuse & Relay Box
(Glove Box)
15
B-425
F-13
NEES(B)
10A
1.25
WHT/
ORN
3
Smoother
Main Relay
1
5
2
X-5
X-5
3
Main
relay
control
Battery voltage
Relay Box
(Instrument Panel)
0.5
BLK/
ORN
0.5
BLK/
ORN
0.5
BLK/
ORN
2
B-426
1
Ignition voltage
F-17
NEES(IG)
10A
7A-6 Transmission Control System (Smoother)
TCM Ground and DLC
TCM
4
B-426
0.5
BLK
2
BLK
12
0.5
BLK
17
1.25
BLK
8
2
12
1
13
Diagnostic
request
(SRS)
Diagnostic
request
(ECM)
Diagnostic
request
(EHCU)
Class 2 Serial
Communication
Ground
Ground
5
B-79
4
18
B-428
11
Diagnostic
request
switch
Diagnostic
request
1.25
BLK
1.25
BLK
0.3
BLK/
WHT
0.5
BLK
0.5
BLK
0.3
WHT/
BLK
0.3
WHT/
GRN
0.5
YEL
0.5
GR
Y
0.5L
T
BLU
DLC
9
B-426
7
Keyword 2000
Keyword serial
communication
0.3
L
T
BLU
0.5
L
T
BLU
EHCU (ABS Module)
EHCU (ABS Module)
ECM
SRS C/U
ECM
B-1
Frame
W/S-D
18
21
22
J/C-B
W/S-C
Signal ground
Signal ground
Power ground
Power ground
N7A2133E
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