Mitsubishi Pajero Pinin. Manual — part 124
MPI <4G9> –
Troubleshooting
13C-82
Terminal
No.
Normal condition
Check condition (Engine condition)
Check item
21
Radiator motor relay (LO)
Radiator fan and condenser fan are not
operating (Engine coolant temperature
is 90
_
C or less)
System voltage
Radiator fan and condenser fan are not
operating (Engine coolant temperature
is 90 – 105
_
C or less)
0 – 3 V
22
Fuel pump relay
Ignition switch: ON
System voltage
Engine: Idle speed
0 – 3 V
33
Alternator G terminal
D
Engine: Warm, idle
(radiator fan: OFF)
D
Headlamp: OFF to ON
D
Rear defogger switch: OFF to ON
D
Brake lamp: ON
Voltage rises by 0.2 – 3.5 V.
41
Alternator FR terminal
D
Engine: Warm, idle
(radiator fan: OFF)
D
Headlamp: OFF to ON
D
Rear defogger switch: OFF to ON
D
Brake lamp: ON
Voltage drops by 0.2 – 3.5 V.
36
Engine warning lamp
Ignition switch: “LOCK” (OFF) position
→
ON
0 – 3 V
→
9 – 13 V
(After several seconds have
elapsed)
37
Power steering fluid
pressure switch
Engine: Idling after
warming up
When steering
wheel is stationary
System voltage
When steering
wheel is turned
0 – 3 V
38
Control relay
(Power supply)
Ignition switch: “LOCK” (OFF) position
System voltage
(Power supply)
Ignition switch: ON
0 – 3 V
45
A/C switch 1
Engine: Idle speed
Turn the A/C
switch OFF
0 – 3 V
Turn the A/C
switch ON (A/C
compressor is
operating)
System voltage
58
Tachometer signal
Engine r/min: 3,000 r/min
0.3 – 3.0 V
60
Oxygen sensor (front)
heater
Engine: Idling after warming up
0 – 3 V
heater
Engine r/min: 5,000 r/min
System voltage
54
Oxygen sensor (rear)
heater
Engine: Idling after warming-up
0 – 3 V
heater
Engine r/min: 5,000 r/min
System voltage
71
Ignition switch – ST
Engine: Cranking
8 V or more
MPI <4G9> –
Troubleshooting
13C-83
Terminal
No.
Normal condition
Check condition (Engine condition)
Check item
72
Intake air temperature
sensor
Ignition switch: ON
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
80
_
C
0.4 – 1.0 V
75
Oxygen sensor (rear)
D
Transmission: 2nd gear <M/T>,
L range <A/T>
D
Engine r/min: 3,500 r/min or more
D
Driving with the throttle valve
widely open
0.6 – 1.0 V
76
Oxygen sensor (front)
Engine: Running at 2,500 r/min after
warmed up (Check using a digital type
voltmeter)
0
´
0.8 V
(Changes repeatedly)
77
A/C thermo sensor
D
Ignition switch: ON
D
Temperature at sensor: 25
_
C (1.5
k
Ω
)
2.2 V
80
Backup power supply
Ignition switch: “LOCK” (OFF) position
System voltage
81
Sensor impressed
voltage
Ignition switch: ON
4.5 – 5.5 V
82
Ignition switch – IG
Ignition switch: ON
System voltage
83
Engine coolant
temperature sensor
Ignition switch: ON
When engine
coolant tempera-
ture is 0
_
C
3.2 – 3.8 V
When engine
coolant tempera-
ture is 20
_
C
2.3 – 2.9 V
When engine
coolant tempera-
ture is 40
_
C
1.3 – 1.9 V
When engine
coolant tempera-
ture is 80
_
C
0.3 – 0.9 V
84
Throttle position
sensor
Ignition switch: ON
Set throttle valve
to idle position
0.3 – 1.0 V
Fully open throttle
valve
4.5 – 5.5 V
MPI <4G9> –
Troubleshooting
13C-84
Terminal
No.
Normal condition
Check condition (Engine condition)
Check item
85
Barometric pressure
sensor
Ignition switch: ON
When altitude is
0 m
3.7 – 4.3 V
When altitude is
1,200 m
3.2 – 3.8 V
86
Vehicle speed sensor
D
Ignition switch: ON
D
Move the vehicle slowly forward
0
´
5 V
(Changes repeatedly)
88
Camshaft position
sensor
Engine: Cranking
0.4 – 3.0 V
sensor
Engine: Idle speed
0.5 – 2.0 V
89
Crank angle sensor
Engine: Cranking
0.4 – 4.0 V
Engine: Idle speed
1.5 – 2.5 V
90
Air flow sensor
Engine: Idle speed
2.2 – 3.2 V
Engine r/min: 2,500 r/min
CHECK CHART FOR RESISTANCE AND CONTINUITY
BETWEEN TERMINALS
1.
Turn the ignition switch to “LOCK” (OFF) position.
2.
Disconnect the engine-ECU connector.
3.
Measure the resistance and check for continuity between
the terminals of the engine-ECU harness-side connector
while referring to the check chart.
NOTE
(1) When measuring resistance and checking continuity,
a harness for checking contact pin pressure should
be used instead of inserting a test probe.
(2) Checking need not be carried out in the order given
in the chart.
MPI <4G9> –
Troubleshooting
13C-85
Caution
If the terminals that should be checked are mistaken,
or if connector terminals are not correctly shorted
to earth, damage may be caused to the vehicle wiring,
sensors, engine-ECU and/or ohmmeter.
Be careful to prevent this!
4.
If the ohmmeter shows any deviation from the standard
value, check the corresponding sensor, actuator and
related electrical wiring, and then repair or replace.
5.
After repair or replacement, recheck with the ohmmeter
to confirm that the repair or replacement has corrected
the problem.
Engine-ECU Harness Side Connector Terminal Arrangement
Terminal
No.
Inspection item
Normal condition (Check condition)
1 – 12
No. 1 injector
13 – 16
Ω
(At 20
_
C)
14 – 12
No. 2 injector
2 – 12
No. 3 injector
15 – 12
No. 4 injector
4 – 12
Stepper motor coil (A)
28 – 33
Ω
(At 20
_
C)
17 – 12
Stepper motor coil (B)
5 – 12
Stepper motor coil (C)
18 – 12
Stepper motor coil (D)
6 – 12
EGR control solenoid valve
29 – 35
Ω
(At 20
_
C)
9 – 12
Purge control solenoid valve
29 – 35
Ω
(At 20
_
C)
13 – Body
earth
Engine-ECU earth
Continuity (0
Ω
)
26 – Body
earth
Engine-ECU earth
60 – 12
Oxygen sensor (front) heater
4.5 – 8.0
Ω
(At 20
_
C)
54 – 12
Oxygen sensor (rear) heater
11 – 18
Ω
(At 20
_
C)
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