Mitsubishi Montero (2004+). Manual — part 263

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-539

STEP 17. 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".
(7) Select "Evap Leak Mon".
(8) During this test, keep the accelerator pedal at the idling

position.

(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 : Replace the PCM (Refer to

P.13A-1014

). Then go to

Step 18 .

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 18.

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 monitoring from Step 17.

STEP 18. 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 diagnostic trouble code (DTC).
Q: Is DTC P0442 set?

YES : Repeat the troubleshooting from Step 1.
NO : The procedure is complete.

AC306409AF

MB991911

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-540

DTC P0443: Evaporative Emission Control System Purge Control Valve Circuit

WHITE-

BLA

C

K

WHITE-

BLA

CK

BR

O

WN-

WHITE

AK2302419

RED

MFI RELAY

BATTERY

23

2

1

3 4

1 2

B-22X

1

4

3

2

POWERTRAIN
CONTROL
MODULE (PCM)

EVAPORATIVE EMISSION
PURGE SOLENOID

Evaporative Emission Purge Solenoid Circuit

1 2

B-06

MU802779

1

2

3

5

6 7 8 9

4

20

21 22

232425

2627

10111213

14 15

16 1718

19

D-132

(MU803802)

8

7

6

5

1 2 3 4

B-44

MU802609

BR

O

WN-

WHITE

4

AK201039

MFI RELAY

B-22X

AB

CONNECTOR: B-22X

AK200968

EVAPORATIVE
EMISSION PURGE
SOLENOID

AB

B-06(B)

CONNECTOR: B-06

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-541

.

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, the PCM
measures the surge voltage of the evaporative
emission 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

.

AK201038

CONNECTOR: D-132

AB

PCM

D-132(GR)

AK201050

B-44(B)

AB

CONNECTOR: B-44

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-542

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Engine is being cranked.

• Battery positive voltage is between 10 and 16.5

volts.

Judgment Criteria

• The evaporative emission purge solenoid coil

surge voltage (battery positive voltage + 2 volts)
is not detected for 0.2 second.

• The PCM monitors for this condition once during

the drive cycle.

Check Conditions

• Battery positive voltage is between 10 and 16.5

volts.

• ON duty cycle of the evaporative emission purge

solenoid is between 10 and 90 percent.

• Evaporative emission ventilation solenoid is OFF.

• More than 1 second has elapsed after the above

mentioned conditions have been met.

Judgment Criteria

• The evaporative emission purge solenoid coil

surge voltage (battery positive voltage + 2 volts)
is not detected for 1 second after the evaporative
emission purge solenoid is turned OFF.

.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function

− OBD-II Drive Cycle −

Procedure 6

− Other Monitor

P.13A-4

.

.

TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )

• Evaporative emission purge solenoid failed.

• Open or shorted evaporative emission purge

solenoid circuit, harness damage, or connector
damage.

• PCM failed.

MONITORING

CONDITIONS

NO

NO

YES

YES

GOOD

MALFUNCTION

WAS SURGE VOLTAGE

(> VB+2V) DETECTED?

START

END

AK302954