Mitsubishi Montero Sport (2004+). Manual - part 268

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-485

STEP 3. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− OBD-II Drive Cycle − Procedure 5 − 

Exhaust Gas Recirculation (EGR) System Monitor 

P.13A-4

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0401 set?

YES : Repeat the troubleshooting.
NO :  The procedure is complete.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-486

DTC P0403: Exhaust Gas Recirculation Control Circuit

WHITE-

BL

ACK

WHITE-

BL

ACK

WHITE-

BL

ACK

AK301902

EGR Vacuum Regulator Solenoid Valve Circuit

RED

YELL

OW

-

RED

RED

RED

1

2

3

4

MFI
RELAY

FUSIBLE LINK (12)

22

33

2

12

23

1

6

POWERTRAIN CONTROL
MODULE (PCM)

1 2

A-11

EGR VACUUM
REGULATOR
SOLENOID VALVE

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-487

.

CIRCUIT OPERATION

• The EGR vacuum regulator solenoid valve power 

is supplied from the MFI relay (terminal No. 1).

• The PCM controls the EGR vacuum regulator 

solenoid valve ground by turning the power tran-
sistor in the PCM "ON" and "OFF".

.

TECHNICAL DESCRIPTION

• To judge if there is open circuit in the EGR vac-

uum regulator solenoid valve drive circuit, PCM 
measures the surge voltage of the EGR vacuum 
regulator solenoid valve coil.

.

DESCRIPTIONS OF MONITOR METHODS
Off-surge does not occur after stepper motor is oper-

ated 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

.

AK200024

CONNECTOR: A-11

AC

A-11(BR)

THROTTLE
BODY

EGR VACUUM REGULATOR
SOLENOID VALVE

AK201000

MFI RELAY

CONNECTOR: C-59

AB

C-59

AK103911AB

CONNECTOR: C-14

C-14

AK103738AD

CONNECTOR: C-89

PCM

C-89(GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-488

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Engine is being cranked.

• Battery positive voltage is at between 10 and 

16.5 volts.

Judgment Criteria

• The EGR vacuum regulator solenoid valve 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 

16.5 volts.

• ON duty cycle of the EGR vacuum regulator sole-

noid valve is between 10 and 90 percent.

• ON duty cycle of the evaporative emission purge 

solenoid is 0 percent.

• Evaporative emission ventilation solenoid is OFF.

• More than 1 second has elapsed after the above 

mentioned conditions have been met. 

Judgment Criteria

• The EGR vacuum regulator solenoid valve coil 

surge voltage (battery positive voltage + 2 volts) 
is not detected for 1 second.

.

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:)

• EGR vacuum regulator solenoid valve failed.

• Open or shorted EGR vacuum regulator solenoid 

valve circuit, harness damage or connector dam-
age.

• PCM failed.

START

END

MALFUNCTION

GOOD

MONITORING

CONDITIONS

WAS SURGE VOLTAGE

(> V

B

+2V) DETECTED?

NO

NO

YES

YES

AK204017