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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:

− 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

Equipment side
connector

Engine coolant
temperature sensor

AKX01622AD

AKX01623AD

AK402087

Connector: A-122

Harness side

connector

A-122(G)

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

P.15-21

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

Oxygen sensor
equipment side connector

AK402019

Oxygen sensor (rear)

Connector: B-53

B-53 Harness side connector

B-53

AK000121

Oxygen sensor

MB991658

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

P.15-21

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

P.13B-370

CHECK THE INJECTION CONDITION

1. Release residual pressure from the fuel pipe line

to prevent fuel gush out (Refer to

P.13B-360

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

Oxygen sensor

AK402132

1 2

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

AK402144

MB992001

Injector

Fuel pressure
regulator
(MD116395)

Return hose

Fuel high-pressure
hose

AK402129

1 2 3 4 5

Equipment side
connector

Electronic-controlled
throttle valve

Main

Index

Group

TOC

Content .. 758 759 760 761 ..