Mitsubishi Evolution X. Manual - part 227

EMISSION CONTROL <MFI - T/C>

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ENGINE AND EMISSION CONTROL

17-77

2. Before inspection and adjustment, set the vehicle in the 

following conditions:

• Engine coolant temperature: 80 − 95° C (176 − 203° F)

• Lights, electric cooling fan and accessories: OFF

• Transaxle: Neutral (P range on vehicles with TC-SST)

3. Run the engine at idle for more than four minutes.
4. Check the purge flow volume when engine is revved 

suddenly several times.

Standard value: Momentarily 20 cm

3

/s (2.5 SCFH) or 

more.

5. If the purge flow volume is less than the standard value, 

check it again with the vacuum hose disconnected from the 
EVAP canister. If the purge flow volume is less than the 
standard value, check the vacuum port and the vacuum 
hose for clogging. Also check the EVAP purge solenoid. If 
the purge flow volume is at the standard value, with the 
EVAP canister disconnected, replace the EVAP canister.

EVAPORATIVE EMISSION PURGE SOLENOID 
CHECK

M1173001700773

1. Disconnect the vacuum hose (black, black with red paint 

mark) from the evaporative emission (EVAP) purge 
solenoid.
NOTE: When disconnecting the vacuum hose, always place 
an identification mark so that it can be reconnected at its 
original position.

2. Disconnect the harness connector.

AK200339AB

A

B

3. Connect a hand vacuum pump to nipple (A) of the EVAP 

purge solenoid (refer to the illustration at left).

4. As described in the chart below, check airtightness by 

applying a vacuum with voltage applied directly from the 
battery to the EVAP purge solenoid valve and without 
applying voltage.

Jumper wire

Nipple "B" state Normal state

Connected

Opened

Negative 
pressure leaks

Closed

Negative 
pressure 
maintained

Disconnected

Opened

Negative 
pressure 
maintained

AK103872

EMISSION CONTROL <MFI - T/C>

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ENGINE AND EMISSION CONTROL

17-78

5. Measure the resistance between the terminals of the EVAP 

purge solenoid.

Standard value: 22 

− 26 Ω [at 20° C (68° F)]

6. Replace the solenoid if resistance is out of specification.

MASS AIRFLOW SENSOR CHECK

M1173050400213

To inspect the sensor, refer to GROUP 13A, Multiport Fuel 
Injection (MFI) 

− Multiport Fuel Injection (MFI) Diagnosis − 

Diagnostic Trouble Code Chart 

P.13A-44

.

No. 1 INTAKE AIR TEMPERATURE SENSOR 
CHECK

M1173008200412

To inspect the sensor, refer to GROUP 13A, Multiport Fuel 
Injection (MFI) 

− Multiport Fuel Injection (MFI) Diagnosis − 

Diagnostic Trouble Code Chart 

P.13A-44

.

BAROMETRIC PRESSURE SENSOR CHECK

M1173008000388

To inspect the sensor, refer to GROUP 13A, Multiport Fuel 
Injection (MFI) 

− Multiport Fuel Injection (MFI) Diagnosis − 

Diagnostic Trouble Code Chart 

P.13A-44

.

ENGINE COOLANT TEMPERATURE SENSOR 
CHECK

M1173008100772

To inspect the sensor, refer to GROUP 13A, Multiport Fuel 
Injection (MFI) 

− Multiport Fuel Injection (MFI) Diagnosis − 

Diagnostic Trouble Code Chart 

P.13A-44

.

THROTTLE POSITION SENSOR CHECK

M1173050500038

To inspect the sensor, refer to GROUP 13A, Multiport Fuel 
Injection (MFI) 

− Multiport Fuel Injection (MFI) Diagnosis − 

Diagnostic Trouble Code Chart 

P.13A-44

.

CRANKSHAFT POSITION SENSOR CHECK

M1173008300419

To inspect the sensor, refer to GROUP 13A, Multiport Fuel 
Injection (MFI) 

− Multiport Fuel Injection (MFI) Diagnosis − 

Diagnostic Trouble Code Chart 

P.13A-44

.

EMISSION CONTROL <MFI - T/C>

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ENGINE AND EMISSION CONTROL

17-79

EVAPORATIVE EMISSION CANISTER AND FUEL TANK PRESSURE RELIEF 
VALVE

REMOVAL AND INSTALLATION

M1173004800520

Pre-removal and post-installation operation
• Rear Wheel Splash Shield Rear Removal and Installation 

(Refer to GROUP 42A, Splash Shield 

P.42A-13

).

AC709346

4.5 ± 1.5 N·m
40 ± 13 in-lb

4.5 ± 1.5 N·m
40 ± 13 in-lb

5.5 ± 1.5 N·m
49 ± 13 in-lb

11 ± 2 N·m
93 ± 22 in-lb

11 ± 2 N·m
93 ± 22 in-lb

1

2

3

4

5

6

7

8

9

10

AB

Removal steps 

1.

Evaporative emission ventilation 
solenoid valve connector 
connection

2.

Fuel vapor tube assembly

3.

Fuel purge pipe assembly 
connection

4.

Vent hose A

5.

Air filter

6.

Vent hose B

7.

Fuel vapor canister and bracket 
assembly

8.

Fuel vapor canister bracket

9.

Fuel vapor canister assembly

10. Vent pipe

Removal steps (Continued)

EMISSION CONTROL <MFI - T/C>

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ENGINE AND EMISSION CONTROL

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INSPECTION

M1173004900271

EVAPORATIVE EMISSION VENTILATION 
SOLENOID CHECK

AC611222

Evaporative emission canister and
evaporative emission vent solenoid assembly

Nipple A

Hand
vacuum
pump

Plug

Nipple B

AB

1. Connect a hand vacuum pump to nipple (A) of the 

evaporative emission canister and evaporative emission 
ventilation solenoid assembly.

2. Connect a plug to nipple (B) of the evaporative emission 

canister and evaporative emission ventilation solenoid 
assembly.

AC611223

Evaporative emission vent solenoid

AB

3. Check air tightness by applying a vacuum with voltage 

applied directly from the battery to the evaporative emission 
ventilation solenoid and without applying voltage.

Battery voltage

Normal condition

Applied

Vacuum maintained

Not applied

Vacuum leaks

AC611224

Evaporative emission vent solenoid

AB

4. Measure the resistance between the terminals of the 

solenoid.

Standard value: 17 

− 21 Ω [at 20° C (68° F)]