Mitsubishi Evolution X. Manual — part 332

INTAKE AND EXHAUST DIAGNOSIS

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INTAKE AND EXHAUST

15-3

SYMPTOM PROCEDURES

Inspection Procedure 1: Exhaust Leakage

DIAGNOSIS

STEP 1. Start the engine. Have an assistant stay
in the driver’s seat. Raise the vehicle on a hoist.
Have the assistant rev the engine while
searching for exhaust leaks.

Q: Is the exhaust leaking?

YES :

Go to Step 2.

NO :

The procedure is complete.

STEP 2. Check the gasket for cracks, damage.

Q: Is the gasket damaged?

YES :

Replace the gasket, then go to Step 1.

NO :

Go to Step 3.

STEP 3. Check for loosening in each coupling
section.

Q: Is there any loosening in any section?

YES :

Tighten, then go to Step 1.

NO :

There is no action to be taken.

Inspection Procedure 2: Abnormal Noise

DIAGNOSIS

STEP 1. Start the engine. Have an assistant stay
in the drivers seat. Raise the vehicle on a hoist.
Have the assistant rev the engine while
searching for exhaust leaks.

Q: Is any abnormal noise generated?

YES :

Go to Step 2.

NO :

The procedure is complete.

STEP 2. Check for missing parts in the muffler.
Tap the muffler lightly to check for loose baffles,
etc.

Q: Are there any missing parts in the muffler?

YES :

Replace, then go to Step 1.

NO :

Go to Step 3.

STEP 3. Check the hanger for cracks.

Q: Is the hanger cracked?

YES :

Replace, then go to Step 1.

NO :

Go to Step 4.

STEP 4. Check for interference of the pipes and
muffler with the body.

Q: Are the pipes and muffler interfering with the

body?
YES :

Repair, then go to Step 1.

NO :

Go to Step 5.

STEP 5. Check the heat protectors.

Q: Are any heat protectors loose or damaged?

YES :

Tighten or replace, then go to Step 1.

NO :

Go to Step 6.

STEP 6. Check the pipes and muffler for damage.

Q: Are the pipes and muffler damaged?

YES :

Replace, then go to Step 1.

NO :

There is no action to be taken.

SPECIAL TOOLS

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INTAKE AND EXHAUST

15-4

SPECIAL TOOLS

M1151000601024

Tool

Tool number and name Supersession

Application

B992274

MB992274
Palm socket

-

Removal and installation
of turbocharger
compressor bracket

MB991614

MB991614
Angle gauge

General service tool

Installation of
turbocharger assembly
coupling bolt and nut

B991953

MB991953
Oxygen sensor wrench

MB991953-01

Removal and installation
of heated oxygen sensor

MB992188
Fuel injection pipe
wrench

MB992188-01

Removal and installation
of No.2 air temperature
sensor

TROUBLESHOOTING

M1151010200035

Symptom

Probable cause

Remedy

Exhaust gas leakage

Loose joints

Retighten

Broken pipe or muffler

Repair or replace

Abnormal noise

Broken baffle in muffler

Replace

Broken rubber hangers

Replace

Interference of pipe or muffler with vehicle
body

Correct

Broken pipe or muffler

Repair or replace

ON-VEHICLE SERVICE

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INTAKE AND EXHAUST

15-5

ON-VEHICLE SERVICE

MANIFOLD VACUUM CHECK

M1151001800352

Refer to GROUP 11A, Engine Mechanical

− On-vehicle Service

− Manifold Vacuum Check.

P.11A-16

INTAKE CHARGE PRESSURE CHECK

M1151001000549

AK703282

Cap

AC

No. 1 turbocharger

wastegate solenoid

1. Removing the black hose from the No.1 turbocharger

wastegate solenoid or the brown connector, install the
pressure gauge to this hose. Cap the nipple of solenoid after
removing the black hose.

AK703283 AC

No. 2 turbochager
wastegate solenoid

2. Disconnect the black connector of No.2 turbocharger

wastegate solenoid.

3. When the engine speed reaches approximately 3000r/min

or more with the throttle fully opened in the second gear,
measure the boost pressure.

Standard value: 85

− 159kPa (12.4 − 23.0 psi)

4. If the boost pressure is lower than the standard, check the

following possible causes.

a. Turbocharger wastegate actuator malfunction
b. Boost pressure leakage

c. Turbocharger malfunction

5. If the boost pressure is higher than the standard, check on

the following areas because the boost pressure control
might be abnormal.

a. Turbocharger wastegate actuator malfunction
b. Wastegate regulating valve malfunction

c. Rubber hose of turbocharger wastegate actuator discon-

nected or cracked

AK703283 AC

No. 2 turbochager
wastegate solenoid

6. Connect the black connector of No.2 turbocharger

wastegate solenoid.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

ON-VEHICLE SERVICE

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INTAKE AND EXHAUST

15-6

7. If the diagnostic trouble code is stored during the check, use

scan tool MB991958 to eliminate the diagnosis code.

TURBOCHARGER WASTEGATE ACTUATOR
CHECK

M1151001200413

AK703279

AC

Turbochager wastegate actuator

1. Connect a hand vacuum pump (pressure-application type)

to nipple.

CAUTION

In order to abovid damage to the diaphragm, do not apply
a pressure of 117 kPa (17 psi) or higher.
2. While gradually applying pressure, check the pressure that

begins to activate (approximately 1 mm stroke) the
wastegate actuator rod.

Standard value: 98

− 102 kPa (14.3 − 14.7 psi)

3. If there is a significant deviation from the standard value,

check the actuator or the wastegate valve: replace if
necessary.