Mitsubishi Grandis. Manual — part 780
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-371
Actuator Test Reference Table
M1131152500796
Item
No.
Inspection
item
Drive content
Inspection
conditions
Normal
condition
Code No.
/Inspection
procedure No.
Reference
page
01
Injector
Cut off No. 1
injector
Engine: After
warm-up, idle
operation (Cut off
injectors sequentially
to check for a cylinder
that does not change
engine in idle status.
Engine is
changed
(becomes
unstable or
stalled)
Code No.
P0201
02
Cut off No. 2
injector
Code No.
P0202
03
Cut off No. 3
injector
Code No.
P0203
04
Cut off No. 4
injector
Code No.
P0204
07
Fuel pump
Drive fuel pump
to circulate fuel
Ignition
switch:
"ON"
Check for
pump
operating
noise near
fuel tank
Operating
noise audible
Procedure No.
23
08
Purge control
solenoid
valve
Switch solenoid
valve from OFF
to ON
Ignition switch: "OFF" When the
valve is
actuated,
operating
noise is
audible
Code No.
P0443
17
Basic ignition
timing
Switch
engine-ECU
<M/T> or
engine-A/T-ECU
<A/T> to ignition
timing adjusting
mode
• Engine: Idle
operation
• Install timing light
5
° BTDC
−
−
21
Fan
controller
Actuate fan
motor
• Ignition switch:
"ON"
• A/C switch: ON
Fan motor is
rotated
Procedure No.
21
22
Oil control
valve
Oil control valve
turns from OFF
the ON
Ignition switch: "ON"
Clicks when
oil control
valve is
driven
Code No.
P1021
34
Throttle valve
control servo
Stop the throttle
valve control
servo
Ignition switch: "ON"
Throttle valve
is open
Code No.
P2100, P2101,
P2102, P2103
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-372
CHECK AT THE ECU TERMINALS
M1131153500368
TERMINAL VOLTAGE CHECK CHART
1. Connect a needle-nosed wire probe to a voltmeter
probe.
2. Insert the needle-nosed wire probe into each of
the engine-ECU <M/T> or engine-A/T-ECU <A/T>
connector terminals from the wire side, and
measure the voltage while referring to the check
chart.
NOTE:
.
1. Make the voltage measurement with the
engine-ECU <M/T> or engine-A/T-ECU <A/T>
connector connected.
2. You may find it convenient to pull out the
engine-ECU <M/T> or engine-A/T-ECU <A/T>
to make it easier to reach the connector
terminals.
3. The checks can be carried out off the order
given in the chart.
CAUTION
Short-circuiting the positive (+) probe between a
connector terminal and earth could damage the
vehicle wiring, the sensor, engine-ECU <M/T> or
engine-A/T-ECU <A/T> or all of them. Be careful
to prevent this!
3. If voltmeter shows any division from standard
value, check the corresponding sensor, actuator
and related electrical wiring, then repair or
replace.
4. After repair or replacement, recheck with the
voltmeter to confirm that the repair has corrected
the problem.
Engine-ECU <M/T> or engine-A/T-ECU <A/T> Connector Terminal Arrangement
AK201749AB
Needle-nosed wire probe
1
2
3
4
5
6
7
8
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
24
25
26
27
36
37
38
39
40
31
32
33
34
35
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
67
68
69
70
61
62
63
64
65
66
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
113
114
115
116
117
118
119
120
AK303309
Engine-ECU <M/T> or Engine-A/T-ECU <A/T> Connector
C-110
C-113
C-114
C-112
C-111
AC
Terminal
No.
Check item
Check condition (Engine condition)
Normal condition
1
No. 1 injector
While engine is idling after having warmed
up, suddenly depress the accelerator pedal.
From 9
− 13 V
*
,
momentarily drops slightly
5
No. 2 injector
14
No. 3 injector
21
No. 4 injector
3
EGR valve (A)
Ignition switch: Immediately after turning ON 5
− 8 V* (fluctuates for
approximately 3 seconds)
12
EGR valve (B)
19
EGR valve (C)
26
EGR valve (D)
8
A/C relay
• Engine: Idle speed
• A/C switch: OFF → ON (A/C compressor
is operating)
System voltage
→ 1 V or
less
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-373
10
Cylinder 2,3 oxygen
sensor heater (front)
Engine: Idling after warming up
2
− 5 V*
Engine: 4,000 r/min or more
0 V
15
Throttle valve control
servo relay
Ignition switch: ON
System voltage
Running at 3,500 r/min while engine is
warming up after having been started.
1 V or less
16
Fuel pump relay
Ignition switch: ON
System voltage
Engine: Idle speed
1 V or less
17
Fan controller
Radiator and condenser fan is not operating 0
− 0.3 V*
Radiator and condenser fan is operating
0.7 V* or more
18
Cylinder 2,3 oxygen
sensor heater (rear)
Engine: Idling after warming up
System voltage
Engine: 4,000 r/min or more
0 V
23
Purge control
solenoid valve
Ignition switch: ON
Decreases Voltage
Running at 3,500 r/min while engine is
warming up after having been started.
1 V or less
24
Cylinder 1,4 oxygen
sensor heater (rear)
Engine: Idling after warming up
System voltage
Engine: 4,000 r/min or more
0 V
25
Cylinder 1,4 oxygen
sensor heater (front)
Engine: Idling after warming up
2
− 5 V*
Engine: 4,000 r/min or more
0 V
31
Ignition coil
− No. 1
Engine r/min: 3,000 r/min
0.3
− 3.0 V*
32
Ignition coil
− No. 2
35
Ignition coil
− No. 3
52
Ignition coil
− No. 4
34
Power supply
Ignition switch: ON
System voltage
43
40 <M/T> Clutch pedal position
switch
Depress the clutch pedal
System voltage
Release the clutch pedal
1 V or less
45
Alternator G terminal
• Engine: Warm, idle (radiator fan: OFF)
• Headlamp: OFF → ON
• Stop lamp: OFF → ON
• Rear defogger switch: OFF → ON
Voltage increases
50
Ignition switch
− IG
Ignition switch: ON
System voltage
51
Ignition switch
− ST Engine: Cranking
8 V or more
57
Engine control relay
(Power supply)
Ignition switch: "LOCK" (OFF)
System voltage
Ignition switch: ON
1 V or less
58
Backup power
supply
Ignition switch: "LOCK" (OFF)
System voltage
63
Air flow sensor
Engine: Gradually increase the speed.
Voltage increase in
response to revving
70
Crank angle sensor
Engine: Cranking
0.4
− 4.0 V
Engine: Idling
2.0
− 3.0 V
Terminal
No.
Check item
Check condition (Engine condition)
Normal condition
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-374
71
Camshaft position
sensor
Engine: Cranking
2.0
− 4.8 V
Engine: Idling
3.0
− 4.0 V
79 <M/T> Vehicle speed
sensor
• Ignition switch: "ON"
• Move the vehicle forword slowly
0
⇔ 5 V Changes
repeatedly
84
Power steering fluid
pressure sensor
Engine: Idling after
warning up
When steering wheel
is Stationary
0.4
− 1.0 V
When steering wheel
is turned
Voltage rises
Full lock
3.0
− 4.0 V
86
Alternator FR
terminal
• Engine: Warm, idle (radiator fan: OFF)
• Headlamp: OFF → ON
• Stop lamp: OFF → ON
• Rear defogger switch: OFF → ON
Voltage decreases
92
Power supply
voltage applied to
accelerator pedal
position sensor
Ignition switch: "ON"
4.9
− 5.1 V
95
Oil control valve
Ignition switch: ON
System voltage
Engine: warming up, 4,000 r/min
4.0
− 10 V*
97
Sensor impressed
voltage
Ignition switch: ON
4.9
− 5.1 V
98
Engine coolant
temperature sensor
Ignition switch: ON
When engine coolant
temperature is
−20°C
3.9
− 4.5 V
When engine coolant
temperature is 0
°C
3.2
− 3.8 V
When engine coolant
temperature is 20
°C
2.3
− 2.9 V
When engine coolant
temperature is 40
°C
1.3
− 1.9 V
When engine coolant
temperature is 60
°C
0.7
− 1.3 V
When engine coolant
temperature is 80
°C
0.3
− 0.9 V
99
Intake air
temperature sensor
Ignition switch: ON
When intake air
temperature is
−20°C
3.8
− 4.4 V
When intake air
temperature is 0
°C
3.2
− 3.8 V
When intake air
temperature is 20
°C
2.3
− 2.9 V
When intake air
temperature is 40
°C
1.5
− 2.1 V
When intake air
temperature is 60
°C
0.8
− 1.4 V
When intake air
temperature is 80
°C
0.4
− 1.0 V
Terminal
No.
Check item
Check condition (Engine condition)
Normal condition
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