Mitsubishi Colt Ralliart. Manual — part 760
ON-VEHICLE SERVICE
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-365
ENGINE COOLANT TEMPERATURE
SENSOR CHECK
M1131003100896
1. Remove the engine coolant temperature sensor.
2. With temperature sensing portion of engine
coolant temperature sensor immersed in hot
water, check resistance between the terminals of
the connector.
Standard value:
14
− 17 kΩ (at −20°C)
5.1
− 6.5 kΩ (at 0°C)
2.1
− 2.7 kΩ (at 20°C)
0.9
− 1.3 kΩ (at 40°C)
0.48
− 0.68 kΩ (at 60°C)
0.26
− 0.36 kΩ (at 80°C)
3. If the value deviates from the standard value or
the resistance remains unchanged, replace the
engine coolant temperature sensor.
4. Apply sealant to the thread portion.
Specified sealant: 3M NUT Locking Part No.
4171 or equivalent
5. Install the engine coolant temperature sensor and
tighten it to the specified torque.
Tightening torque: 29
± 10 N⋅m
OXYGEN SENSOR CHECK
M1131005001638
OXYGEN SENSOR (FRONT)
1. Disconnect the oxygen sensor connector and
connect the special tool Test harness (MB991658)
to the connector on the oxygen sensor side.
2. Measure resistance between terminal No. 3 and
terminal No. 4 of the oxygen sensor connector.
Standard value: 5
− 30 Ω (at 20°C)
3. If there is no continuity, replace the oxygen
sensor.
4. Warm up the engine until engine coolant is 80
°C
or higher.
5. Perform a tracing for 5 minutes or more with the
engine speed of 4,500 r/min.
AK402127
1 2
AC
Equipment side
connector
Engine coolant
temperature sensor
AKX01622AD
AKX01623AD
AK402087
Connector: A-122
Harness side
connector
A-122(G)
AD
Oxygen sensor (front)
AK101798AE
Oxygen sensor
MB991658
Main
Index
Group
TOC
ON-VEHICLE SERVICE
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-366
6. Connect a digital voltage meter between terminal
No. 1 and No. 2.
7. While repeatedly racing the engine, measure the
oxygen sensor output voltage.
Standard value:
CAUTION
• Be very careful when connecting the jumper
wire; incorrect connection can damage the
oxygen sensor.
• Be careful the heater is broken when voltage
of beyond 12 V is applied to the oxygen sen-
sor heater.
NOTE: If the sufficiently high temperature (of
approximate 400
°
C or more) is not reached
although the oxygen sensor is normal, the output
voltage would be possibly low although the rich
air-fuel ratio. Therefore, if the output voltage is
low, use a jumper wire to connect the terminal No.
3 and the terminal No. 4 of the oxygen sensor with
a (+) terminal and (
−
) terminal of 12 V power sup-
ply respectively, then check again.
8. If the sensor is defective, replace the oxygen
sensor.
NOTE: For removal and installation of the oxygen
sensor, refer to GROUP 15
− Exhaust Pipe and
Main Muffler
− Exhaust Pipe and Main Muffler
Removal and installation
OXYGEN SENSOR (REAR)
1. Disconnect the oxygen sensor connector and
connect the special tool Test harness (MB991658)
to the connector on the oxygen sensor side.
2. Measure resistance between terminal No. 3 and
terminal No. 4 of the oxygen sensor connector.
Standard value: 5
− 30 Ω (at 20°C)
3. If there is no continuity, replace the oxygen
sensor.
4. Warm up the engine until engine coolant is 80
°C
or higher.
5. Perform a tracing for 5 minutes or more with the
engine speed of 4,500 r/min.
Engine
Oxygen
sensor
output
voltage
Remarks
When
racing the
engine
0.6
− 1.0 V If you make the air-fuel
ratio rich by racing the
engine repeatedly, a
normal oxygen sensor
will output a voltage of
0.6
− 1.0 V.
AK402649
MB991658
AC
Oxygen sensor
equipment side connector
AK402019
3
2
1
4
Oxygen sensor (rear)
Connector: B-53
B-53 Harness side connector
AC
B-53
AK000121
Oxygen sensor
MB991658
AC
Main
Index
Group
TOC
ON-VEHICLE SERVICE
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-367
6. Connect a digital voltage meter between terminal
No.1 and No. 2.
7. While repeatedly racing the engine, measure the
oxygen sensor output voltage.
Standard value:
CAUTION
• Be very careful when connecting the jumper
wire; incorrect connection can damage the
oxygen sensor.
• Be careful the heater is broken when voltage
of beyond 12 V is applied to the oxygen sen-
sor heater.
NOTE: If the sufficiently high temperature (of
approximate 400
°
C or more) is not reached
although the oxygen sensor is normal, the output
voltage would be possibly low although the rich
air-fuel ratio. Therefore, if the output voltage is
low, use a jumper wire to connect the terminal No.
4 and the terminal No. 3 of the oxygen sensor with
a (+) terminal and (
−
) terminal of 12 V power sup-
ply respectively, then check again.
8. If the sensor is defective, replace the oxygen
sensor.
NOTE: For removal and installation of the oxygen
sensor, refer to GROUP 15
− Exhaust Pipe and
Main Muffler
− Exhaust Pipe and Main Muffler
Removal and installation
INJECTOR CHECK
M1131005201041
CHECK THE OPERATION SOUND
CAUTION
Beware that the operation sounds of other injec-
tors can be heard even if the injector that is being
inspected might not be operating.
1. Use a stethoscope to listen to the operating sound
(clicking) of the injectors while the engine is idling
or cranking.
2. Verify that the operating sound increases with the
engine speed.
NOTE: If the operating sound cannot be heard,
inspect the injector actuation circuit.
MEASUREMENT OF RESISTANCE
BETWEEN TERMINALS
1. Disconnect the injector connector.
2. Measure the resistance between terminals.
Standard value: 10.5
− 13.5 Ω (at 20°C)
3. If the obtained value is outside the standard value,
replace the injector (Refer to
).
CHECK THE INJECTION CONDITION
1. Release residual pressure from the fuel pipe line
to prevent fuel gush out (Refer to
CAUTION
Cover the hose connection with rags to prevent
splash of fuel that could be caused by some
residual pressure in the fuel pipe line.
2. Remove the high-pressure fuel hose at the
delivery pipe side.
3. Remove the injector.
Engine
Oxygen
sensor
output
voltage
Remarks
When
racing the
engine
0.6
− 1.0 V If you make the air-fuel
ratio rich by racing the
engine repeatedly, a
normal oxygen sensor
will output a voltage of
0.6
− 1.0 V.
AK301808
MB991658
AB
Oxygen sensor
AK402132
1 2
AC
Injector
Equipment side
connector
Main
Index
Group
TOC
ON-VEHICLE SERVICE
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-368
4. Install the injector using the following special tools
as shown in the figure.
• Injector test harness (MB991607)
• Injector holder (MB991976)
• Injector test set (MD998706)
*
• Hose adapter (MB992001)
NOTE: *:Of adapters other than the mounting
adapter for the injector, remove one side of the
adapter.
5. Connect the M.U.T.-III to the diagnosis connector.
6. Turn the ignition switch to "ON" position (but do
not start the engine).
7. Select "Item No. 07" from M.U.T.-III actuator test
and drive the fuel pump.
8. Actuate the injector and check the fuel spray
condition. The condition can be considered
satisfactory unless it is extremely poor.
9. Stop actuating the injector and check leakage
from the injector nozzle.
Standard value: one drop or less/minute
10.Turn the ignition switch to "LOCK" OFF position,
and then disconnect the M.U.T.-III.
11.Actuate the injector until the fuel cannot flow.
Draw the fuel out from the special tool.
12.Remove the special tool.
13.If the fuel spray condition is extremely poor or if
there is the fuel leakage from the injector nozzle,
replace the injector.
14.Install the injector and high-pressure fuel hose.
15.Remove the M.U.T.-III.
THROTTLE VALVE CONTROL SERVO
CHECK
M1131051000315
OPERATION CHECK
1. Remove the air intake hose from the throttle body.
2. Turn the ignition switch to ON position.
3. Operate the accelerator pedal and check that the
throttle valve opens and closes accordingly.
CHECK THE COIL RESISTANCE
1. Disconnect the electronic-controlled throttle valve
connector.
2. Measure the resistance between terminals No. 5
and No. 6 at the electronic-controlled throttle
valve connector.
Standard value: 0.3
− 100 Ω (at 20°C)
3. If the resistance is outside the standard value,
replace the throttle body assembly.
AK402133
MD998706
MB991976
Fuel pressure
regulator
(MD116395)
MB991607
Battery
Injector
Return hose
Fuel high-pressure
hose
MB992001
AC
AK402144
MB992001
AC
Injector
Fuel pressure
regulator
(MD116395)
Return hose
Fuel high-pressure
hose
AK402129
6
1 2 3 4 5
AC
Equipment side
connector
Electronic-controlled
throttle valve
Main
Index
Group
TOC
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