Mitsubishi 380. Manual — part 638
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>
13A-644
ACTUATOR TEST REFERENCE TABLE
M1131152500570
MUT-III
DIAGNOS
TIC TOOL
DISPLAY
ITEM
NO.
INSPECTION
ITEM
DRIVE
CONTENTS
INSPECTION REQUIREMENT
NORMAL
CONDITION
INSPECTION
PROCEDURE
NO.
REFERENCE
PAGE
1
Injectors
Cut fuel to
No.1 injector
Engine: warm up, idle (cut
the fuel supply to each
injector in turn and check
cylinders which don’t
affect idling.)
Idling
becomes
unstable.
Code No.
P0201
2
Cut fuel to
No.2 injector
Code No.
P0202
3
Cut fuel to
No.3 injector
Code No.
P0203
4
Cut fuel to
No.4 injector
Code No.
P0204
5
Cut fuel to
No.5 injector
Code No.
P0205
6
Cut fuel to
No.6 injector
Code No.
P0206
10
Purge
control
solenoid
valve
Solenoid
valve turns
from OFF to
ON.
Ignition switch: "ON"
Clicks
when
solenoid
valve is
driven.
Code No.
P0443
14
PWM
Radiator
fan
Actuate fan
motor
• Ignition switch "ON"
• A/C switch "ON"
Fan motor
is rotated
Symptom
chart
16
A/C relay
Activate A/C
relay
• Ignition switch "ON"
• A/C switch "ON/OFF"
Relay
operates
-
-
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>
13A-645
CHECK AT THE ELECTRONIC CONTROL UNIT (ECU)
1. Disconnect the ECU connectors B-20 and B-21
and connect check harness special tool
MB992044
between the ECU connectors.
2. Measure the voltage between each check
harness connector terminal and check harness
connector ground terminal (No. 25 or No. 29).
TERMINAL VOLTAGE CHECK CHART
03DB159A
Check Harness Special Tool MB992044 Connector Terminal Arrangement
(CONNECTOR
HOUSING NO.)
TERMINAL NO.
INSPECTION
ITEM
INSPECTION CONDITION (ENGINE
CONDITION)
NORMAL
CONDITION
(B-21) - 71
Fan control
Ignition switch: "ON"
5 V fan off
Carry out the actuator test to revolve the fan at
high speed.
1 V or less
(B-21) - 92
Fuel pump relay
Ignition switch: "ON"
B+
Engine: idling
1 V or less
(B-20) - 25
Sensor supplied
voltage
Ignition switch: "ON"
4.9
− 5.1 V
(B-21) - 76
(B-21) - 59
Accelerator pedal
position sensor
(main)
Ignition switch:
"ON"
Release the accelerator
pedal
0.996 V
Depress the accelerator
pedal fully
4.043 V
(B-21) - 81
Accelerator pedal
position sensor
(sub)
Ignition switch:
"ON"
Release the accelerator
pedal
0.996 V
Depress the accelerator
pedal fully
4.043 V
(B-21) - 75
Power supply
voltage applied to
accelerator pedal
position sensor
Ignition switch: "ON"
4.9
− 5.1 V
(B-21) - 21
Brake lamp switch
Depress the brake pedal
B+
Release the brake pedal
1 V or less
(B-21) - 16
Backup power
supply
Ignition switch: "LOCK" (OFF)
B+
(B-21) - 70
Ignition switch-IG
Ignition switch: "ON"
B+
(B-20) - 05
Power supply
Ignition switch: "ON"
B+
(B-20) - 24
MPI relay (power
supply)
Ignition switch: "LOCK" (OFF)
B+
Ignition switch: "ON"
1 V or less
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>
13A-646
(B-20) - 53
Power steering
pressure switch
Engine: warming
up, idling
When steering wheel is not
turned
B+
When steering wheel is
turned
1V or less
(B-20) - 06
A/C compressor
clutch relay
• Engine: idling
• A/C switch: OFF→ ON (A/C compressor is
operating)
B+
→ 1 V or less
as A/C clutch
cycles
(B-20) - 09
Ignition switch-ST
Engine: cranking
8 V or more
(B-20) - 15
Left bank heated
oxygen sensor
(front)
Engine: warming up, 2,500 r/min (check using a
digital voltmeter)
0
⇔ 0.8 V
(changes
repeatedly)
(B-20) - 45
Right bank heated
oxygen sensor
(front)
Engine: warming up, 2,500 r/min (check using a
digital voltmeter)
0
⇔ 0.8 V
(changes
repeatedly)
(B-20) - 56
Engine coolant
temperature
sensor
Ignition switch:
"ON"
When engine coolant
temperature is
−20°C (−4°F)
3.9
− 4.5 V
When engine coolant
temperature is 0
°C (32°F)
3.2
− 3.8 V
When engine coolant
temperature is 20
°C (68°F)
2.3
− 2.9 V
When engine coolant
temperature is 40
°C (104°F)
1.3
− 1.9 V
When engine coolant
temperature is 60
°C (140°F)
0.7
− 1.3 V
When engine coolant
temperature is 80
°C (176°F)
0.3
− 0.9 V
(B-20) - 10
Power supply
voltage applied to
throttle position
sensor
Ignition switch: "ON"
4.9
− 5.1 V
(B-20) - 30
Left bank heated
oxygen sensor
(rear)
• Engine: warming up
• Revving
0 and 0.6
− 1.0 V
alternates
(B-20) - 60
Right bank heated
oxygen sensor
(rear)
• Engine: warming up
• Revving
0 and 0.6
− 1.0 V
alternates
(CONNECTOR
HOUSING NO.)
TERMINAL NO.
INSPECTION
ITEM
INSPECTION CONDITION (ENGINE
CONDITION)
NORMAL
CONDITION
MULTIPORT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>
13A-647
(B-20) - 57
Throttle position
sensor (sub)
• Remove the
intake air hose
at the throttle
body.
• Ignition switch:
"ON"
• Visually inspect
throttle plate for
full travel.
Fully depress and release
accelerator pedal.
WARNING
If the air intake duct is
removed from the
throttle body take great
care to keep fingers
away from the throttle
plate. The drive motor
has very high torque
and is capable of
random movement at
any time. Do not under
any circumstances
activate the throttle
plate by hand.
1172
− 4043 mV
(B-20) - 42
Throttle position
sensor (main)
• Remove the
intake air hose
at the throttle
body.
• Ignition switch:
"ON"
• Visually inspect
throttle plate for
full travel.
Fully depress and release
accelerator pedal.
WARNING
If the air intake duct is
removed from the
throttle body take great
care to keep fingers
away from the throttle
plate. The drive motor
has very high torque
and is capable of
random movement at
any time. Do not under
any circumstances
activate the throttle
plate by hand.
1172
− 4043 mV
(B-20) - 41
Manifold absolute
pressure sensor
Ignition switch:
"ON"
AT altitude of 0 m (0 ft.)
3.8
− 4.2 V
AT altitude of 600 m (1,969
ft.)
3.5
− 3.9 V
AT altitude of 1,200 m (3,937
ft.)
3.3
− 3.7 V
AT altitude of 1,800 m (5,906
ft.)
3.0
− 3.4 V
Engine: warming up, idling
0.6
− 1.4 V
When engine is suddenly revved
Voltage Varies
(B-20) - 23
Crankshaft
position sensor
Engine: cranking
0.4 - 4.0 V
Engine: idling
2.0 - 3.0 V
(CONNECTOR
HOUSING NO.)
TERMINAL NO.
INSPECTION
ITEM
INSPECTION CONDITION (ENGINE
CONDITION)
NORMAL
CONDITION
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