Mitsubishi Colt Ralliart. Manual — part 102
ON-VEHICLE SERVICE
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-362
ENGINE COOLANT TEMPERATURE
SENSOR CHECK
M1131003101156
CAUTION
Be careful not to touch the connector (resin sec-
tion) with the tool when removing and installing.
1. Remove the engine coolant temperature sensor
using coolant temperature sensor wrench, special
tool (MB992042).
2. With temperature sensing portion of engine
coolant temperature sensor immersed in hot
water, check resistance.
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 resistance deviates from the standard value
greatly, replace the sensor.
4. Apply sealant to threaded portion.
Specified sealant:
LOCTITE 262 or equivalent
5. Tighten the engine coolant temperature sensor to
the specified torque, using coolant temperature
sensor wrench, special tool (MB992042)
Tightening torque: 29
± 10 N⋅m
OXYGEN SENSOR CHECK
M1131005001627
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. Make sure that there is continuity (5
− 30 Ω at
20
°C) between terminal No. 3 and No. 4 on the
oxygen sensor connector.
AK402201
1 2
Engine coolant
temperature sensor
AC
Equipment side
connector
AK503116 AC
MB992042
AKX01622
AKX01623AD
AK402203
AC
Equipment side
connector
Oxygen sensor
(front) connector
AK101798
MB991658
AG
Oxygen sensor
side connector
Main
Index
Group
TOC
ON-VEHICLE SERVICE
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-363
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.
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 8V is applied to the oxygen sensor
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
supply 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. Make sure that there is continuity (5
− 30 Ω at
20
°C) between terminal No. 3 and No. 4 on the
oxygen sensor connector.
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
AD
Oxygen sensor
Equipment side connector
AK403439
2
1
3 4
AC
Equipment side connector
Oxygen sensor (rear)
Oxygen sensor (rear) connector
AK402205
MB991658
AC
Oxygen sensor side
connector
Main
Index
Group
TOC
ON-VEHICLE SERVICE
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-364
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 oxy-
gen sensor, refer to GROUP 15
−
Exhaust Pipe
and Main Muffler
−
Exhaust Pipe and Main Muffler
Removal and installation
INJECTOR CHECK
M1131005201416
CHECK THE OPERATION SOUND
1. Use a stethoscope to listen to the operation sound
(clicking) of the injectors while the engine is idling
or cranking.
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.
2. Verify that the operation 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: 14
− 15 Ω (at 20°C)
3. Connect the injector connector.
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.
AK402650
MB991658
AC
Oxygen sensor
Equipment side connector
AK402289
1 2
AC
Injector
equipment side
connector
Injector
Main
Index
Group
TOC
ON-VEHICLE SERVICE
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-365
CHECK THE INJECTION CONDITION
1. Carry out the procedure to prevent flow of the fuel
(Refer to
CAUTION
Do not make fuel splash by covering fuel with
waste and so on because the residual pressure is
in the fuel pipeline.
2. Remove the fuel high-pressure hose at the
delivery pipe side.
3. Remove the injector.
4. Assemble Injector Test Set (MB992076 or
MD998706) of the special tool as shown in Fig.
a. Remove the installation hose for the injector.
b. Install the injector to the installation hose for the
injector and then fix it using Injector Holder
(MB991976) of the special tool.
5. Install the special tool hose adapter (MB992001)
to the installation hose for the injector and connect
them to the fuel high-pressure hose.
6. Connect the M.U.T.-III to the diagnosis connector.
7. Turn the ignition switch to "ON" position (but do
not start the engine).
8. Select "Item No. 07" from M.U.T.-III actuator test
and drive the fuel pump.
9. Connect Injector Test Harness (MB991607) of the
special tool between the injector and battery, and
then actuate the injector.
10.Check the fuel spray condition. The condition can
be considered satisfactory unless it is extremely
poor.
11.Stop actuating the injector. Check leakage from
the injector nozzle. Turn the ignition switch to
"LOCK OFF" position and then disconnect
M.U.T.-III.
12.Actuate the injector until the fuel cannot flow.
Draw the fuel out from the special tool.
13.Remove the special tool.
14.If the fuel spray condition is extremely poor or if
there is the fuel leakage from the injector nozzle,
replace the injector.
15.Install the injector and fuel high-pressure hose.
OIL FEEDER CONTROL VALVE CHECK
M1131053800050
OPERATION CHECK
1. Disconnect the oil feeder control valve connector.
CAUTION
To prevent the coil from burning, keep the dura-
tion of the voltage application as short as possi-
ble.
2. Apply battery voltage to the terminals of the
connector at the oil feeder control valve, and
make sure the oil feeder control valve makes a
clicking sound.
AK402078AD
MB991976
Injector
MB992076
or
MD998706
AK402079AE
MB991976
MB992001
MB992076
or
MD998706
Fuel
high-pressure
hose
Injector
AK402080AC
MB991607
AK402207
1 2
AC
Oil feeder
control valve
Oil feeder
control valve side
connector
Main
Index
Group
TOC
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