Mitsubishi Montero (2002-2004). Manual - part 680

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-417

STEP 16. Check for leaks in the evaporative emission 
canister.
(1) Remove the evaporative emission canister. (Refer to 

GROUP 17, Evaporative Emission Canister and Fuel Tank 
Pressure Relief Valve 

P.17-66

).

(2) Connect a hand vacuum pump to the vent nipple of the 

evaporative emission canister.

(3) Plug the other two nipples or loop a hose between them.
(4) Apply vacuum with the hand vacuum pump and confirm that 

the canister holds vacuum.

Q: Does the evaporative emission canister hold vacuum?

YES : Reinstall the evaporative emission canister. (Refer to 

GROUP 17, Evaporative Emission Canister and Fuel 
Tank Pressure Relief Valve 

P.17-66

). Go to Step 17   .

NO :  Replace the evaporative emission canister. (Refer to 

GROUP 17, Evaporative Emission Canister and Fuel 
Tank Pressure Relief Valve 

P.17-66

). Go to Step 18   .

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DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-418

STEP 17. Using scan tool MB991502, check evaporative 
emission system monitor test.

CAUTION

• To prevent damage to scan tool MB991502, always turn 

the ignition switch to the "LOCK" (OFF) position before 
connecting or disconnecting scan tool MB991502.

• 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 MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Erase the DTCs using scan tool MB991502. (Refer to 

GROUP 13A, Trouble Code Diagnosis 

P.13Ab-2

).

(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.

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

range. When the monitor test starts, the "In Progress" item 
on scan tool MB991502 will change from "NO" to "YES".

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

disconnect scan tool MB991502.

Q: What is displayed on scan tool MB991502?

"Evap Leak Mon. Completed. Test Passed" : The 

evaporative emission system is working properly at 
this time. Go to Step 18  .

"Evap Leak Mon. Completed. Test Failed and DTCs Set" 
: 

Replace the PCM. Go to Step 18.

"Evap Lead Mon. discontinued. Retest again from the 
first" : The monitor test was interrupted. Turn the ignition 

switch to the "LOCK" (OFF) position once and repeat 
evaporative emission system monitor test.

STEP 18. Perform the OBD-II drive cycle.
(1) Confirm the repair by performing the appropriate drive 

cycle. [Refer to GROUP 13A, Trouble Code Diagnosis 

− 

OBD-II Drive Cycle (Procedure 1: Evaporative Emission 
Control system Leak Monitor) 

P.13Ab-2

].

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

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

ACX01539

16-PIN

MB991502

AC

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-419

DTC P0443: Evaporative Emission System Purge Control Valve Circuit

WHITE-

BL

ACK

WHITE-

BL

ACK

BROWN-

WHITE

AK201145

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)

AK201039

MFI RELAY

B-22X

AB

CONNECTOR: B-22X

AK200968

EVAPORATIVE
EMISSION PURGE 
SOLENOID

AB

B-06(B)

CONNECTOR: B-06

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DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-420

.

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.

.

DTC SET CONDITIONS

Check Conditions

• Engine is being cranked.

• Battery positive voltage is at between 10 and 16 

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 at between 10 and 16 

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. When the evapora-
tive emission purge solenoid is turned OFF.

.

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, or loose connector.

• PCM failed.

AK201038

CONNECTOR: D-132

AB

PCM

D-132(GR)