Mitsubishi Pajero Pinin. Manual — part 123
MPI <4G9> –
Troubleshooting
13C-78
Item
No.
Reference
page
Inspection
procedure
No.
Normal condition
Inspection contents
Inspection
item
A1
L
Oxygen
sensor
Engine: After warm-up
Idling
0.2 V or less
Code No.
P0130
13C-25
L
sensor
(sensor 1)
Sudden racing
0.6 – 1.0 V
P0130
2,500 r/min
0.4 V or less and
0.6 – 1.0 V alter-
nates
A2
L
Oxygen
sensor
(sensor 2)
D
Transmission:
2nd gear <M/T>,
L range <A/T>
D
Drive with throttle
widely open
3,500 r/min
0.6 – 1.0 V
Code No.
P0136
13C-27
8A
L
Throttle
position
sensor
D
Engine coolant
temperature:
80
95
_
C
Release the acceler-
ator pedal.
6 – 20 %
Code No.
P0120
13C-22
sensor
(Throttle
valve open-
ing angle)
80 – 95
_
C
D
Ignition switch:
ON
(Engine: Stopped)
Depress the acceler-
ator pedal gradually
Increase in re-
sponse to pedal
depression
stroke.
Depress the acceler-
ator pedal fully.
80 – 100 %
MPI <4G9> –
Troubleshooting
13C-79
ACTUATOR TEST REFERENCE TABLE
Item
No.
Inspection
item
Drive contents
Inspection contents
Normal condition
Inspection
procedure
No.
Reference
page
01
Injectors
Cut fuel to No.
1 injector
Engine: After having warmed
up/Engine is idling
(Cut the fuel supply to each
Idling condition
becomes different
(becomes unsta
Code No.
P0201
13C-30
02
Cut fuel to No.
2 injector
(Cut the fuel supply to each
injector in turn and check
cylinders which don’t affect
idli
)
(becomes unsta-
ble).
Code No.
P0202
13C-30
03
Cut fuel to No.
3 injector
y
idling.)
Code No.
P0203
13C-30
04
Cut fuel to No.
4 injector
Code No.
P0204
13C-30
07
Fuel pump
Fuel pump
operates and
fuel is recircu-
lated.
D
Engine:
Cranking
D
Fuel
pump:
Forced
driving
Inspect
according
Pinch the
return hose
with fingers
to feel the
pulse of the
fuel being
recirculated.
Pulse is felt.
Procedure
No. 27
13C-69
according
to both
the above
conditions.
Listen near
the fuel tank
for the
sound of
fuel pump
operation.
Sound of opera-
tion is heard.
08
Purge
control
solenoid
valve
Solenoid valve
turns from
OFF to ON.
Ignition switch: ON
Sound of opera-
tion can be heard
when solenoid
valve is driven.
Code No.
P0443
13C-38
10
EGR con-
trol sole-
noid valve
Solenoid valve
turns from
OFF to ON.
Ignition switch: ON
Sound of opera-
tion can be heard
when solenoid
valve is driven.
Code No.
P0403
13C-36
17
Basic igni-
tion timing
Set to ignition
timing adjust-
ment mode
Engine: Idling
Timing light is set
5
_
BTDC
–
–
21
Fan relay
Drive the fan
motor
Ignition switch: ON
Radiator fan and
condenser fan
operate at high
speed
Proce-
dure No.
24
13C-67
MPI <4G9> –
Troubleshooting
13C-80
CHECK AT THE ENGINE-ECU TERMINALS
TERMINAL VOLTAGE CHECK CHART
1.
Connect a needle-nosed wire probe (test harness:
MB991223 or paper clip) to a voltmeter probe.
2.
Insert the needle-nosed wire probe into each of the
engine-ECU 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
connectors connected.
(2) You may find it convenient to pull out the engine-ECU
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 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.
Needle-nosed wire probe
MPI <4G9> –
Troubleshooting
13C-81
Engine-ECU Connector Terminal Arrangement
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
From 11 – 14 V, momentarily
drops slightly
14
No. 2 injector
warmed up, suddenly depress the
accelerator pedal.
drops slightly
2
No. 3 injector
15
No. 4 injector
4
Stepper motor coil <A>
Engine: Soon after the warmed up
engine is started
System voltage
´
0 V
(Changes repeatedly)
17
Stepper motor coil <B>
engine is started
(Changes repeatedly)
5
Stepper motor coil <C>
18
Stepper motor coil <D>
6
EGR control solenoid valve
Ignition switch: ON
System Voltage
While engine is idling, suddenly depress
the accelerator pedal.
From system voltage,
momentarily drops
8
A/C relay
D
Engine: Idle speed
D
A/C switch: OFF
→
ON
(A/C compressor is operating)
System voltage or
momentarily
6 V or more
→
0 – 3 V
9
Purge control solenoid
valve
Ignition switch: ON
System voltage
valve
Running at 3,000 r/min while engine is
warming up after having been started.
0 – 3 V
10
Ignition coil – No. 1,
No. 4 (power transistor)
Engine r/min: 3,000 r/min
0.3 – 3.0 V
23
Ignition coil – No. 2,
No. 3 (power transistor)
12
Power supply
Ignition switch: ON
System voltage
25
19
Air flow sensor reset
signal
Engine: Idle speed
0 – 1 V
signal
Engine r/min: 3,000 r/min
6 – 9 V
20
Condenser motor relay
(HI)
Radiator fan is not operating (Engine
coolant temperature is 90
_
C or less)
System voltage
Radiator fan is not operating (Engine
coolant temperature is 105
_
C or less)
0 – 3 V
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