Isuzu N-Series. Service manual — part 645
6E-2 Engine Control System (4HK1)
Repair Instructions . . . . . . . . . . ... 6E-330
. . . . . . . . . . . . . . . . . .. 6E-335
Crankshaft Position (CKP) Sensor Replacement
. . . . . . . . . . . . . . . . . .. 6E-335
. . . . . . . . . . . . . . . . . .. 6E-344
. . . . . . . . . . . . . . . . . .. 6E-354
Vehicle Speed Sensor (VSS) Replacement.. 6E-354
Description and Operation . . . . . . . ... 6E-356
Engine Control System (4HK1) 6E-3
Specifications
Temperature vs Resistance
Engine Coolant Temperature vs. Resistance
Intake Air Temperature vs. Resistance
Fuel Temperature vs. Resistance
Altitude vs Barometric Pressure
°C
°F
Ω
Temperature vs. Resistance Value (Approximately)
110
230
160
100
212
200
90
194
260
80
176
350
70
158
470
60
140
640
50
122
880
40
104
1250
30
86
1800
20
68
2650
10
50
4000
0
32
6180
-10
14
9810
-20
-4
16000
-30
-22
27000
°C
°F
Ω
Temperature vs. Resistance Value (Approximately)
90
194
240
80
176
320
70
158
450
60
140
660
50
122
960
40
104
1440
30
86
2300
20
68
3430
10
50
5410
0
32
9770
-10
14
16410
20
-4
28560
°C
°F
Ω
110
230
140
100
212
180
90
194
240
80
176
310
70
158
420
60
140
580
50
122
810
40
104
1150
30
86
1660
20
68
2450
10
50
3700
0
32
5740
-10
14
9160
-20
-4
15000
-30
-22
25400
Altitude Measured
in Meters (m)
Altitude Measured
in Feet (ft)
Barometric
Pressure
Measured in
Kilopascals (kPa)
Determine your altitude by contacting a local weather
station or by using another reference source.
4267
14000
56-64
3962
13000
58-66
3658
12000
61-69
3353
11000
64-72
3048
10000
66-74
2743
9000
69-77
2438
8000
71-79
2134
7000
74-82
1829
6000
77-85
1524
5000
80-88
1219
4000
83-91
914
3000
87-98
610
2000
90-98
305
1000
94-102
0
0 Sea Level
96-104
-305
-1000
101-105
°C
°F
Ω
6E-4 Engine Control System (4HK1)
Schematic and Routine Diagrams
Engine Controls Schematics
Power Distribution
SBF-2
KEY
40A
SBF-1
MAIN
100A or 120A
2L
30
BLK/
RED
8 BLK
0.3
GRN/
ORN
3
WHT/
BLK
F-1
HEATER,
AIR CON
15A
Heater &
A/C Relay
1
2
X-12
5
4
X-12
F-2
FUEL
HEATER
10A
F-7
TAIL
LIGHT
10A
Heater
Relay
1
2
X-8
5
4
X-8
Tail
Relay
1
2
X-4
5
4
X-4
Charge
Relay
3
BLK/
RED
3
BLU
5
WHT
5
WHT/
BLK
8
WHT/
BLK
3
WHT/
BLK
3
WHT/
BLK
0.5
WHT/
RED
0.5 WHT/RED
3
WHT
F-22
STARTER
10A
F-9
ENG.
(IG)
10A
F-16
METER
10A
3
BLK/
YEL
W/S-H
W/S-E
USW
JOINT 3
3
BLK/
YEL
3
BLK
0.5
BLK
2
BLK
0.5 BLK
B-67
4
H-6
2
H-7
1
SBF-3
GLOW
60A
3
BLK/
BLU
0.5
BLK
3
WHT/
RED
1.25
RED
Glow
Plug
Relay
3
4
X-20
2
5
X-20
SBF-8
STARTER
60A
Fuse &
Relay Box
(Behind
the Cab)
Fuse &
Relay Box
(Behind
the Cab)
Fuse &
Relay Box
(Glove Box)
Relay Box
(Instrument
Panel)
Relay Box
(Instrument
Panel)
Fuse &
Relay Box
(Glove Box)
Fuse &
Relay Box
(Glove Box)
SBF-5
ECM
40A
ECM
Main
Relay
Starter
Relay
ECM
ECM
Combination
Switch
Glow
Plug
ECM
0.5
BLU/
BLK
2
RED
0.5
BLK/
RED
3
BLK/
YEL
3
WHT/
BLK
2
BLK
J-9
Frame
2
ST
ON
ACC
OFF
B-67
3
B-67
Ignition
Switch
Fuse &
Relay Box
(Behind the Cab)
P-5
B-7
H/L
Bracket
6
J/C-D
1
Battery
P-1
P-2
P-3
P-4
N6A6628E
0.5
YEL/
BLK
3
5
X-18
2
4
X-18
F-28
ECM
10A
Engine Control System (4HK1) 6E-5
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
1
H-7
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)
2
B-67
2
3
J/C-2
0.85
L
T
GRN
0.5
L
T
GRN
ECM
Main Relay
5
2
X-21
4
3
X-21
5
1
X-26
3
4
X-26
ST
ON
ACC
OFF
Ignition
Switch
N6A6629E
Starter
B
C
1
J-27
1
J-26
Fuse &
Relay Box
(Behind
the Cab)
Starter
Relay
Fuse &
Relay Box
(Behind the Cab)
Fuse &
Relay Box
(Behind the Cab)
Starter Cut
Relay
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