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
(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
.
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.
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