Isuzu N-Series. Manual — part 1062
CAB AND CHASSIS ELECTRICAL 8-353
Vacuum Switching Valve: Transfer Control (for
4WD)
Inspection
Connect the vacuum switching valve connector terminal
No. 2 to the battery (+) terminal and terminal No. 4 to the
(
−) terminal and then check the continuity among each
port.
4WD Detective Switch
Inspection of the 4WD Warning Light Circuit
1. Disconnect the 4WD switch connectors.
2. Connect the harness side connector terminals.
3. Check to see if the indicator light comes on with the
starter switch “ON”.
Check the bulb or harness when the result of in-
spection is found abnormal.
Inspection
1. Shift the transfer lever to the 4H (4L) position.
2. Check to see if there is continuity between the
4WD switch connectors.
Replace the switch when the result of the inspec-
tion is found abnormal.
N8A5446E
N8A5447E
N8A5448E
8-354 CAB AND CHASSIS ELECTRICAL
ABS (Anti-lock Brake System, Without ASR)
Parts Location
H-16
J-74 F/RH SENSOR
B-66 ST
OPLIGHT SW
(BRAKE SW)
B-1 EARTH ;
FRAME (FR)
B-67 IGNITION SW "A"
B-233,B-234 ECM
FUSE BOX ASM
F-2,F-5,F-16
STARTER SW
J-148 R/RH
SENSOR (24V)
J-177
ABS EHCU
B-52 EXH. BRAKE
IND. LAMP (METER)
B-51
ABS ARNING LIGHT
(METER)
J-75 F/LH SENSOR
B-79 DATA LINK CONNECTOR
J-9 EAR
TH ;
FRAME
(12V)
(24V)
X-5 ABS INDICATOR RELAY
X-8 EXHAUST BRAKE RELAY
(24V)
RELAY BOX ASM (No.1)
X-25 EXHAUST BRAKE CONTROL RELAY
X-28 EXHAUST BRAKE CUT RELAY
J-23 DIODE
FL-1,FL-2,FL-9 FUSIBLE LINK
J-31 EXH. BRAKE
MAGNETIC VALVE
B-75
ACCEL SW
H-13
P-5
P-1
~
P-4
BATTERY
H-17
H-14
H-15
J-149 R/LH
SENSOR (24V)
R-6
STOPLIGHT (RH)
R-1
STOPLIGHT (LH)
SENSOR (12V)
J-78 R/RH,R/LH
B-7 EARTH ;
HEADLIGHT B/T
B-69
EXH. BRAKE SW
B-89 CLUTCH SW
H-5
~
H-8
N8A0537E
CAB AND CHASSIS ELECTRICAL 8-355
Circuit Diagram
For 12 Volt (4JH1 Engine)
ABS
60A
P-5
P-2
BATTERY
P-1
B-1
B-7
0.85B
H-6
2
B-51
7
B-51
8
FL-9
MAIN
100A
FL-1
KEY SW
50A
FL-2
METER
10A
F-16
8B
8W/B
3R
8W/B
3W/B
3W/B
0.5G/Y
0.5G
SW ; STOP LIGHT
B
OFF
ACC
ON
ST
B-67
2
B-67
3
KEY SW
3W/L
0.5B
2B
3B
0.5B/Y
0.5B/Y
0.5B/Y
STOP LIGHT
10A
F-5
B-66
4
B-66
1
0.5B/Y
0.5W
X-5
4
X-5
5
X-5
1
X-5
3
3B/Y
METER
ABS
RELAY ;
ABS IND.
3W/L
H-7
1
3B
3B
2B
0.3W/V
22
H-5
J-9
P-4
P-3
FRAME-LH (CENTER)
FRAME LH (FRONT)
HEADLIGHT BRACKET (LH)
C
D
E
F
A
B
G
H
N8A5590E
8-356 CAB AND CHASSIS ELECTRICAL
J-78
4
J-78
3
0.5R
0.5W
0.3W/G
0.3W/B
0.3W/G
0.3W/B
0.3W/B
0.5B
0.5B
SPEED
SENSOR
(RR,RH)
J-74
1
J-74
2
0.5P
0.5L
SPEED
SENSOR
(FRT,RH)
J-75
1
J-75
2
0.5V
0.5R/B
0.5P
0.5L
0.5V
0.5R/B
SPEED
SENSOR
(FRT,LH)
0.85B
J-177
22
J-177
16
STOP LAMP
EHCU ; ABS
ECM
B-234 (62)
RL 12V
34
J-78
2
J-78
1
24
MOTOR +B
RL SIG
32
2
VALVE +B
FL SIG
33
23
MOTOR GND
FL GRD
10
1
VALVE GND
FR SIG
11
8
EXH.B/CUT
OUT
FR GRD
21
7
EXH.B/CUT
IN
RR 12V
12
6
IND.
RR SIG
29
IG
MODE1
MODE2
MODE3
J1850
4
FRASH
VEHICLE TYPE CONNECTOR
NKR77-3 (FLAT LOW)
EXCEPT NKR77-3
(EXCEPT FLAT LOW)
2B
3R
3R
3B
3B
0.5B/Y
0.3W/V
0.3W/V
0.3W/V
0.5B/Y
0.5B/Y
0.5B/G
0.5B/R
0.5B/W
1.25B
0.5G
0.5G
0.5G
0.5G
0.5G
H-5
11
2
(30)
ECM
H-16
2
STOP
LIGHT
(RH)
STOP
LIGHT
(LH)
0.5G
1.25B
1.25B
0.5L
0.5Y
SPEED
SENSOR
(RR,LH)
16 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
H-5
35
H-5
36
H-5
40
H-14
10
H-14
11
H-14
12
DATA LINK
CONNECTOR
B-79
0.3W/G
H-5
27
H-5
26
3R
0.5G
0.5LG/B
0.5LG/W
0.5LG/B
0.5LG
0.5LG/W
0.5LG/B
3B
3B
ECM
B-234 (32)
B-234
J-177
J-177
J-177
J-177
J-177
J-177
J-177
J-177
J-177
J-177
J-177
J-177
J-177
J-177
J-177
J-177
H-14
H-14
15
H-14
16
H-15
1
H-15
2
H-15
5
H-15
6
H-15
4
H-15
3
H-15
7
H-15
8
3
J-177
17
J-177
14
J-177
15
J-177
H-14
9
H-17
4
H-17
3
H-17
1
H-17
2
H-17
H-17
H-17
H-17
H-17
H-17
H-17
H-17
R-1
2
6
R-1
7
H-16
7
H-14
R-6
2
6
R-6
C
D
A
B
E
F
G
H
0.5Y
0.5L
ECM
35
45
B-234
B-234
N8A5591E
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