Mitsubishi Montero Sport (2004+). Manual - part 277

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-521

STEP 14. 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 will automatically increase 

the engine speed to 1,600 r/min or greater. Check that 
the transmission is set to the "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.
Q: Is "Evap Leak Mon. Completed. Test Failed and DTCs 

Set" displayed on scan tool MB991958?
YES : Replace the PCM. Then go to Step 16 .
NO <"Evap Leak Mon. Completed. Test Passed" is 
displayed on scan tool MB991958.> : The evaporative 

emission system is working properly at this time. Then 
go to Step 16 .

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-522

STEP 15. Check the evaporative emission canister for 
leaks.
(1) Remove the canister. (Refer to GROUP 17, Evaporative 

Emission Canister and Fuel Tank Pressure Relief Valve 

P.17-116

).

(2) Connect a hand vacuum pump to the canister instead of 

hose, and plug the other nipples.

(3) Apply a pressure on the hand vacuum pump, and confirm 

that air is maintained.

Q: Is the evaporative emission canister in good condition?

YES : Go to Step 14 .
NO :  Replace the canister. (Refer to GROUP 17, 

Evaporative Emission Canister and Fuel Tank 
Pressure Relief Valve 

P.17-116

). Then go to Step 16 .

STEP 16. Perform the OBD-II drive cycle.
(1) Confirm the repair by performing the appropriate drive 

cycle. (Refer to Diagnostic Function 

− OBD-ll Drive Cycle − 

Procedure 1 

− Evaporative Emission System Leak Monitor 

P.13A-4

).

(2) Read the DTC.
Q: Is DTC P0442 set?

YES : Repeat the troubleshooting procedure. Return to Step 

1 .

NO :  The procedure is complete.

AC004931

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-523

DTC P0443: Evaporative Emission Control System Purge Control Valve Circuit

WHITE-

BLA

CK

WHITE-

BLA

CK

WHITE-

BLA

CK

AK200191

Evaporative Emission Purge Solenoid Circuit

RED

YELLO

W

-

BLA

CK

RED

3

4

MFI
RELAY

FUSIBLE LINK (12)

19

12

2

1

34

1

POWERTRAIN CONTROL
MODULE (PCM)

2

EVAPORATIVE EMISSION
PURGE SOLENOID

1 2

A-10
MU802779

C-59

1

10

2 3 4 5 6 7 8 9

11

12 13 14 15 16 17 18 19 20 21 22

23 24 25 26 27 28 29 30 31 32 33

C-14

10

2

3 4

5 6

7 8

9

11 12 13 14 15 16 17 18 19 20

30

21 22 23

24

25

26 27 28 29

31 32 33

34 35

1

C-89
(MU803784)

JOINT
CONNECTOR (5)

1

2

3

4

AK200026AB

CONNECTOR: A-10

EVAPORATIVE EMISSION
PURGE SOLENOID

A-10(B)

AK201000

MFI RELAY

CONNECTOR: C-59

AB

C-59

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-524

.

CIRCUIT OPERATION

• Power to the evaporative emission purge sole-

noid power is supplied from the MFI relay (termi-
nal No. 1).

• The PCM controls ground evaporative emission 

purge solenoid by turning the power transistor in 
the PCM "ON" and "OFF".

.

TECHNICAL DESCRIPTION

• To judge if there is open circuit in the evaporative 

emission purge solenoid drive circuit, PCM mea-
sures the surge voltage of the evaporative emis-
sion ventilation solenoid coil.

.

DESCRIPTIONS OF MONITOR METHODS
Off-surge does not occur after solenoid is operated 

from on to off.

.

MONITOR EXECUTION
Once per driving cycle

.

MONITOR EXECUTION CONDITIONS (Other 
monitor and Sensor)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Not applicable

.

AK103911AB

CONNECTOR: C-14

C-14

AK103738AD

CONNECTOR: C-89

PCM

C-89(GR)