Mitsubishi Montero Sport (2004+). Manual - part 299

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-609

DIAGNOSIS

Required Special Tool:

• MB991958: Scan tool (MUT-III sub assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB cable

• MB991911: MUT-III main harness B

STEP 1. Using scan tool MB991958, check evaporative 
emission system monitor test.

CAUTION

• To prevent damage to scan tool MB991958, always turn 

the ignition switch to the "LOCK" (OFF) position before 
connecting or disconnecting scan tool MB991958.

• During this test, the PCM automatically increases the 

engine speed to 1,600 r/min or greater. Check that the 
transmission is set to "P" position.

(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Erase the DTCs using scan tool MB991958.
(4) Check that the fuel cap is securely closed. (Tighten until 

three clicks are heard).

(5) Start the engine.
(6) Select "System Test" and press the "YES" key.
(7) Select "Evap Leak Mon." and press the "YES" key.
(8) During this test, keep the accelerator pedal at the idling 

position.
NOTE: If the engine speed does not reach 2,000 r/min dur-
ing the monitor test, adjust the Speed Adjusting Screw 
(Refer to 

P.13A-883

), and adjust to the standard value.

(9) Keep the engine speed and engine load within the specified 

range. When the monitor test starts, the "In Progress" item 
on scan tool MB991958 will change from "NO" to "YES".

(10)Turn the ignition switch to the "LOCK" (OFF) position and 

disconnect scan tool MB991958.

Q: Is "Evap Leak Mon. Completed. Test Failed and DTCs 

Set" displayed on scan tool MB991958?
YES : A malfunction has been detected during the monitor 

test. Refer to the Diagnostic Trouble Code Chart 

P.13A-26

, and diagnose any other DTCs that are set. 

If no other DTC's have been set, go to Step 2 .

NO <"Evap Leak Mon. Completed. Test Passed" is 
displayed on scan tool MB991958.> : The evaporative 

emission system is working properly at this time. 
Explain to the customer that an improperly tightened 
fuel cap can cause the MIL to illuminate. Return the 
vehicle to the customer.

NO <"Evap Leak Mon. Discontinued. Retest again from 
the first" is displayed on scan tool MB991958.> : The 

EVAP monitor has been interrupted during the test. 
Turn the ignition switch to the "LOCK" (OFF) position 
once, and repeat the monitor test.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-610

STEP 2. Check the evaporative emission purge solenoid 
valve using scan tool MB991958 (Actuator test item 08).

CAUTION

• To prevent damage to scan tool MB991958, always turn 

the ignition switch to the "LOCK" (OFF) position before 
connecting or disconnecting scan tool MB991958.

(1) Connect scan tool MB991958 to the data link connector.

(2) Disconnect hoses A to B from the evaporative emission 

purge solenoid valve side.

(3) Connect a hand vacuum pump to the evaporative emission 

purge solenoid valve instead of hose B.

(4) Turn the ignition switch to the "ON" position.
(5) Set scan tool MB991958 to actuator rest mode.

• Item 08: evaporative Emission Purge solenoid valve.

• When the evaporative emission purge solenoid 

valve is operated, apply a pressure on the hand vac-
uum pump and confirm that air is blown from the 
other side nipple.

(6) Turn the ignition switch to the "LOCK" (OFF) position.
(7) Disconnect the hand vacuum pump, and connect hoses A 

and B to the evaporative emission purge solenoid valve.

Q: Does the evaporative emission purge solenoid hold 

vacuum?
YES : Go to Step 3 .
NO :  Replace the evaporative emission purge solenoid 

valve. Then go to Step 19 .

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

ACX01696 AD

HOSE A

EVAPORATIVE EMISSION

PURGE SOLENOID

HOSE B

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-611

STEP 3. Check for leaks and clogging in the evaporative 
emission system hoses A through C.
Using a hand vacuum pump, do leakage test and clogging test 
on each hose from hose A to hose C.
Q: Are the hoses in good condition?

YES : Go to Step 4 .
NO :  Replace the damaged hose. Then go to Step 19 .

AC005143 AC

HOSE A

HOSE B

HOSE C

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-612

STEP 4. Check the evaporative emission ventilation 
solenoid using scan tool MB991958. (Actuator test item 
29).

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.

(2) Disconnect hose M from the evaporative emission 

ventilation solenoid side.

(3) Connect a hand vacuum pump to the hose M.
(4) Turn the ignition switch to the "ON" position.
(5) Set scan tool MB991958 to actuator test mode.

• Item 29: Evaporative Emission Ventilation Solenoid 

Valve.

• When the evaporative emission ventilation solenoid 

valve is operated, apply a pressure on the hand vac-
uum pump and confirm that air is maintained.

(6) Turn the ignition switch to the "LOCK" (OFF) position and 

disconnect scan tool MB991958.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

AC004932

HOSE M

AF

AC004935