Mitsubishi Lancer Evolution IX. Manual — part 483

ON-VEHICLE SERVICE

MULTIPORT FUEL INJECTION (MPI)

13A-407

The condition can be considered satisfactory
unless it is extremely poor.

8. Stop the actuation of the injector, and check for

leakage from the injector’s nozzle.

Standard value: 1 drop or less per minute

9. Without the fuel pump operation, operate the

injector to draw the fuel out.

10.If the spraying is extremely poor or the fuel

leakage from the injector nozzle deviates from the
standard value, replace the injector.

11.Disconnect the M.U.T.-II/III.

INJECTOR RESISTOR CHECK

M1131052800046

1. Disconnect the injector resistor connector.

AK304584

1 2 3

4 5 6

Equipment side
connector

AB

<L. H. drive vehicles>

<R. H. drive vehicles>

Injector resistor

Injector resistor

1 2 3

4 5 6

AK202415

Injector resistor
connector

AC

ON-VEHICLE SERVICE

MULTIPORT FUEL INJECTION (MPI)

13A-408

2. Measure the resistance between terminals.

3. If the resistance is out of specification, replace the

injector resistor.

IDLE SPEED CONTROL SERVO
(STEPPER MOTOR) CHECK

M1131005400804

Check the Operation Sound

1. Check that the engine coolant temperature is

20

°C or below.

NOTE: Disconnecting the engine coolant temper-
ature sensor connector and connecting the har-
ness-side of the connector to another engine
coolant temperature sensor that is at 20

°

C or

below is also okay.

2. Check that the operation sound of the stepper

motor can be heard after the ignition is switched
"ON" position (but without starting the engine).

3. If the operation sound cannot be heard, check the

stepper motor’s activation circuit.
If the circuit is normal, it is probable that there is a
malfunction of the stepper motor or of the
engine-ECU.

Check the Coil resistance

1. Disconnect the idle speed control servo

connector.

2. Measure the resistance between terminal No. 2

and either terminal No. 1 or terminal No. 3 of the
connector at the idle speed control servo side.

Standard value: 28

− 33 Ω (at 20°C)

3. Measure the resistance between terminal No. 5

and either terminal No. 6 or terminal No. 4 of the
connector at the idle speed control servo side.

Standard value: 28

− 33 Ω (at 20°C)

Measurement terminals

Resistance

1

− 3

4

− 3

5

− 3

6

− 3

5.8

− 6.2 Ω (At 20°C)

AK304586

1 2

3

4 5

6

AB

Equipment side
connector

Idle speed
control servo

AKX01561

1 2 3
4 5 6

1 2 3
4 5 6

AE

ON-VEHICLE SERVICE

MULTIPORT FUEL INJECTION (MPI)

13A-409

Operation Check

1. Remove the throttle body.
2. Remove the stepper motor.
3. Connect the special tool Test harness

(MB991709) to the idle speed control servo
connector.

4. Connect the positive (+) terminal of a power

supply (approximately 6 V) to the terminals No. 2
and No. 5.

5. With the idle speed control servo as shown in the

illustration, connect the negative (

−) terminal of

the power supply to each clip as described in the
following steps, and check whether or not a
vibrating feeling (a feeling of very slight vibration
of the stepper motor) is generated as a result of
the activation of the stepper motor.
(1) Connect the negative (

−) terminal of the power

supply to the red and black clip.

(2) Connect the negative (

−) terminal of the power

supply to the blue and black clip.

(3) Connect the negative (

−) terminal of the power

supply to the blue and yellow clip.

(4) Connect the negative (

−) terminal of the power

supply to the red and yellow clip.

(5) Connect the negative (

−) terminal of the power

supply to the red and black clip.

(6) Repeat the tests in sequence from (5) to (1).

6. If, as a result of these tests, vibration is detected,

the stepper motor can be considered to be
normal.

FUEL PRESSURE SOLENOID VALVE
CHECK

M1131005800114

OPERATION CHECK

1. Remove the vacuum hose from the solenoid

valve.

2. Disconnect the harness connector.

3. Connect a hand vacuum pump to the solenoid

valve’s A nipple.

4. Connect the solenoid valve terminal and battery

terminal with a jumper wire.

5. Disconnect the jumper wire between the battery’s

(

−) terminals, apply a negative pressure, and

inspect the tightness.

Standard valve:

AKX01626

Battery voltage B nipple

Normal
condition

No applied

Open

Vacuum leak

Close

Vacuum
maintained

Applied

Open

Vacuum
maintained

AK304587

1

2

AB

Equipment side
connector

Fuel pressure
solenoid valve

AK202416

B nipple

Battery

AC

ON-VEHICLE SERVICE

MULTIPORT FUEL INJECTION (MPI)

13A-410

COIL RESISTANCE CHECK

1. Measure the resistance between the terminals of

the solenoid valve.

Standard value: 28

− 36 Ω (at 20°C)

OIL FEEDER CONTROL VALVE CHECK

M1131053800072

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.

MEASUREMENT OF RESISTANCE
BETWEEN TERMINALS

1. Disconnect the oil feeder control valve connector.
2. Measure the resistance between the terminals of

the connector at the oil feeder control valve.

Standard value: 6.9

− 7.9 Ω (at 20°C)

3. If resistance is outside the standard value, replace

the oil feeder control valve.

AK304596

AK502034

1 2

AB

Equipment side
connector

Oil feeder
control valve