Mitsubishi Montero Sport (2004+). Manual - part 312

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-661

STEP 14. 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 6 − 

Other Monitor 

P.13A-4

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0507 set?

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

DTC P0513: Immobilizer Malfunction

.

TECHNICAL DESCRIPTION

• PCM monitors the communication condition with 

the immobilizer-ECU and the message from the 
immobilizer-ECU, and when the abnormality is 
found, PCM makes the engine not to start.

.

DTC SET CONDITIONS

Check Conditions

• Ignition switch: ON

Judgment Criteria

• When the communication error between PCM 

and the immobilizer-ECU continues for 2 seconds 
or more.

.

TROUBLESHOOTING HINTS (The most likely 

causes for this code to be set are:)

• Malfunction of harness or connector.

• Malfunction of immobilizer-ECU.

• Malfunction of PCM.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-662

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I

• MB991827: USB Cable

• MB991911: Main Harness B

STEP 1. Using scan tool MB991958, read the immobilizer 
system diagnostic trouble code (DTC).

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) Turn the ignition switch to the "ON" position.
(3) Read the immobilizer system-DTC
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the immobilizer system-DTC set?

YES : Refer to GROUP 54A, Ignition Switch and 

Immobilizer System 

− Diagnostic Trouble Code Chart 

P.54-43

.

NO :  If DTC P0513 is output again after the MFI-DTC has 

been erased, replace the PCM. Then check that the 
DTC P0513 does not reset.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-663

DTC P0551: Power Steering Pressure Sensor Circuit Range/Performance

.

CIRCUIT OPERATION

• A battery positive voltage is applied to the power 

steering pressure switch output terminal (terminal 
1) from the PCM (terminal 52) via the resistor in 
the PCM.

.

TECHNICAL DESCRIPTION

• The power steering pressure switch converts the 

existence of a power steering load into a high/low 
voltage, and inputs it into the PCM.

• When the steering wheel is turned, hydraulic 

pressure rises. The power steering pressure 
switch closes, and the applied battery positive 
voltage will be grounded. With this, the power 
steering pressure switch output voltage will fluc-
tuate between 12 volts and 0 volt.

• While driving with the steering wheel held 

straight, the power steering pressure switch turns 
"OFF".

• The PCM checks whether the power steering 

pressure switch turns "OFF" or "ON" during driv-
ing.

.

DESCRIPTIONS OF MONITOR METHODS
Power steering pressure switch stays on during 

specified go/stop operations.

.

MONITOR EXECUTION
Continuous

.

AK000604

Power Steering Pressure Switch Circuit

BL

UE-

WHITE

52

1

POWER STEERING
PRESSURE SWITCH

POWERTRAIN CONTROL
MODULE (PCM)

1

A-76

47

41

42 43

48 49 50 51 52 53 54 55 56 57

46

45

44

58

59

60 61 62 63

64 65 66

C-90
(MU803781)

AK200032 AB

CONNECTOR: A-76

POWER STEERING
PRESSURE SWITCH

A-76

AK103738AC

CONNECTOR: C-90

PCM

C-90(GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-664

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)

• Engine coolant temperature sensor

.

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Engine coolant temperature is higher than 30°C 

(86

°F).

• Repeat 10 or more time: drive*1, stop*2

Drive*1: Vehicle speed is 50 km/h (31 mph) or 

more for 4 seconds.

Stop*2: Vehicle speed is 1.5 km/h (0.9 mph) or 

lower.

Judgment Criteria

• Power steering pressure switch continues to be 

"ON".

.

OBD-II DRIVE CYCLE PATTERN
None.

YES

NO

NO

NO

MONITORING

CONDITIONS

END

MALFUNCTION

GOOD

START

POWER STEERING

SWITCH = "ON"

YES

GO/STOP OPERATION

FOR SPECIFIED TIMES

YES

AK301453

F1: COUNTER OF A DRIVING STATE.
F2: COUNTER OF A STOP STATE.