1998 SSANGYONG MUSSO Workshop Repair Manual

1F2-40 M161 ENGINE CONTROLS
Application
Pin No.Abbreviation Description
-
Starter motor TM.50
-
-
Electronic ground
-
Lambda probe 2 heating
-
Lambda probe 1 heating
Power ground TM.31
V-BATTERY TM.87
V-BATTERY TM.30
Immobilizer crypto read
Immobilizer crypto write
-
Lambda probe 1 ground
Lambda probe 1 signal
-
-
-
Brake switch
-
-
-
-
-
Air conditioning clutch relay
-
-
-1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30-
TM.50
-
-
GND
-
LSH2
-
LSH1
TM.31
TM.87
TM.30
WFS I/O
WFS O
-
GND
LS1
-
-
-
BRS
-
-
-
-
-
KLIKU
-
-
--
l
-
-
l
-
-
-
l
l
l
l
l
l
-
l
l
-
-
-
¡
-
-
-
-
-
l
-
-
--
l
-
-
l
-
-
-
l
l
l
l
l
l
-
l
l
-
-
-
¡
-
-
-
-
-
l
-
-
-
l: Standard, ¡: OptionE23 ENG,
4speed A/T E23 ENG,
5speed A/T

M161 ENGINE CONTROLS 1F2-41
Pin No.Abbreviation Description
Pedal potentiometer 1 ground
Pedal potentiometer 1 supply
Fuel pump relay
Tank purge valve
Engine fan
-
CAN-Low
CAN-High
-
-
-
-
-
Air conditioning
Electronic traction signal(ABD option only)
-
Pedal potentiometer 1 signal
Pedal potentiometer 2 signal
Brake light switch(Cruisel option only)
Pedal potentiometer 2 ground
Pedal potentiometer 2 supply
Cruise accelerate/Set(Cruisel option only)
Cruise resume(Cruisel option only)
Cruise decelerate/Set(Cruisel option only)
Cruise safety contact switch(Cruisel option only)
-
Cruise off switch(Cruisel option only)
Diagnostics(K-Line)
Vehicle speed signal
Engine speed signal31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60GND
SP1+5V
KP
TEV
ML
-
CAN L
CAN H
-
-
-
-
-
KLIMA
ETS
-
SP1S
SP2S
BLS
GND
SP2+2.5V
S+B
WA
S-B
KSK
-
AUS
DIAG
V-SIG
TN-SIGl
l
l
l
l
-
l
l
-
-
-
-
-
l
¡
-
l
l
¡
l
l
¡
¡
¡
¡
-
¡
l
l
ll
l
l
l
l
-
l
l
-
-
-
-
-
l
¡
-
l
l
¡
l
l
¡
¡
¡
¡
-
¡
l
l
l
E23 ENG,
4speed A/T E23 ENG,
5speed A/T

1F2-42 M161 ENGINE CONTROLS
Pin No.
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
Abbreviation Description
-
-
Injector-cylinder 1
Injector-cylinder 2
Injector-cylinder 3
Injector-cylinder 4
E-GAS motor plus
E-GAS motor minus
Power ground TM.31
-
Ignition coil cylinder 2+3
Ignition coil cylinder 1+4
Camshaft control
-
Second air pump relay
-
Engine coolant temperature
Temperature ground
Intake air temperature
Hot film air mass signal
-
-
E-GAS potentiometer ground
E-GAS potentiometer 2 signal
-
E-GAS potentiometer 1 signal
-
-
-
-
-
EV1
EV4
EV2
EV3
M+
M-
TM.31
-
ZSB23
ZSA14
NWS
-
-
SLP
-
MT
GND
LT
HFM
-
-
-
IP2S
-
IP1S
-
-
--
-
l
l
l
l
l
l
l
-
l
l
l
-
-
¡
-
l
l
l
l
-
-
l
l
-
l
-
-
-
-
-
l
l
l
l
l
l
l
-
l
l
l
-
-
¡
-
l
l
l
l
-
-
l
l
-
l
-
-
-
E23 ENG,
4speed A/T E23 ENG,
5speed A/T

M161 ENGINE CONTROLS 1F2-43
Pin No.Abbreiation Description
-
-
-
-
-
-
-
-
Crankshaft sensor ground
Crankshaft sensor signal
-
-
-
Camshaft sensor ground
Hot film air mass ground
Camshaft sensor signal
-
Hot film air mass supply
-
-
-
E-GAS potentiometer supply
-
-
-
-
Knock sensor 1 ground
Knock sensor 1 signal
-
-
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
11 0
111
11 2
11 3
11 4
11 5
11 6
11 7
11 8
11 9
120-
-
-
-
-
-
-
-
KW-
KW+
-
-
-
NOWE-
GND
NOWE+
-
V-REF.HFM
-
-
-
V-REF.DK
-
-
-
-
GND
KS1
-
-
-
-
-
-
-
-
-
-
l
l
-
-
-
l
l
l
-
l
-
-
-
l
-
-
-
-
l
l
-
--
-
-
-
-
-
-
-
l
l
-
-
-
l
l
l
-
l
-
-
-
l
-
-
-
-
l
l
-
-
E23 ENG,
4speed A/T E23 ENG,
5speed A/T
-
-
-
-
-
-
-
-
l
l
-
-
-
l
l
l
-
l
-
-
-
l
-
-
-
-
l
l
-
-
E23 ENG,
4speed A/T

1F2-44 M161 ENGINE CONTROLS
Removal & Installation Procedure
· ·· ·
·When removing the ECU only
1. Turn the ignition switch to "OFF" position.
2. Disconnect the negative battery cable.
3. Disconnect the couplings from ECU.
4. Unscrew the left and right bolt (3) on bolt (1) and auxiliarly
bracket and remove the auxiliarly bracket from the bracket
assembly (2).
Installation Notice
5. Unscrew the four bolts (5) and disconnect the ECU (6) from
the bracket assenbly.
Installation Notice
6. Installation should follow the removal procedure in the
reverse order.
Tightening Torque6 - 8 Nm
5 - 7 Nm(1)
(3)
Tightening Torque 5 - 7 Nm
8. Unscrew the bolts (5) and disconnect the ECU (6) from the
bracket assenbly.
Installation Notice · ·· ·
·When Removing the ECU with ABS or ABS/ASR Unit
1. Turn the ignition switch to "OFF" position.
2. Disconnect the negative battery cable.
3. Disconnect the couplings from ECU.
4. Disconnect the coupling from ABS or ABS/ASR unit.
5. Unscrew the bolt (1) and the left and right flange nuts.
6. Remove the ECU with ABS or ABS/ASR unit assembly.
7. Unscrew the left and right bolt (3) on the auxiliary bracket
and remove the auxiliary bracket from the bracket assembly.
Installation Notice
Tightening Torque 6 - 8 Nm
Tightening Torque 5 - 7 Nm
Tightening Torque 5 - 7 Nm
9. Installation should follow the removal procedure in the
reverse order.

M161 ENGINE CONTROLS 1F2-45
1 Vacuum Hose
2 Circlip
3 Fuel Pressure Regulator
FUEL PRESSURE REGULATOR
4 O-ring ..................................................... replace
5 O-ring ..................................................... replace

1F2-46 M161 ENGINE CONTROLS
3. Disconnect the vacuum hose.
4. Disconnect the circlip and remove the fuel pressure
regulator.
5. Apply the oil to O-ring lightly and then replace it.
6. Installation should follow the removal procedure in the
reverse order.
7. Check for fuel pressure and internal leaks by operating the
engine. 2. Discharge the pressure in fuel supply system by pressing
the service valve.
Removal & Installation Procedure
1. Remove the fuel pressure test connector.

M161 ENGINE CONTROLS 1F2-47
A . Valves Closed
B. Valves Opened
The pressure difference between the fuel pressure and the
intake manifold is about 3.8 bars during the full load.

The spring chamber(9) is connected to the intake manifold
with the vacuum hose at the intake pipe connection(7). The
negative pressure generated in the intake manifold activates
the diaphragm, and thus the fuel pressure gets reduced to the
rate of the operating extent of the diaphragm by the intake
manifold's negative pressure.
Consequently, the fuel pressure in the fuel distributor changes
by the intake manifold's negative pressure, and the injector's
fuel pressure gets reduced independently to the throttle valve's
position. Thus, the fuel injection volume can only be determined
according to the injector's injecting duration.
2. Fuel return line
3. Valve
5. Diaphragm
6. Compression Spring
8. Fuel chamber
9. Spring Chamber
1. Fuel pressure Regulator
2. Intake Manifold
3. Fuel return(to fuel tank)
4. Fuel supply(form fuel pump)
5. Fuel pressure(approx. 3.8 bars)
6. Intake Manifold Negative Pressure(0 bar)
Function of the Fuel Pressure Regulator
The fuel pressure regulator maintains the fuel pressure in the
fuel line with the pressure of 3.2 bars to 3.8 bars according to
the intake manifold pressure. This operating pressure cannot
be changed, and the fuel injection volume will be only
determined by the injection time. Over supplied fuel returns to
the fuel tank through the return line.

There is no negative pressure applied to the spring chamber(9)
during the full load, and it is separated from the fuel chamber(8)
by the diaphragm(5).
When the fuel pressure goes up, the diaphragm forces the
compression spring(6) in the direction of compression . At this
moment, the valve(3) sticks to the diaphragm by the fuel
pressure, and the fuel return line(2) opens. The fuel over
supplied returns to the fuel tank through the return line.