Mitsubishi Montero Sport (2004+). Manual - part 149

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-9

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.
NOTE: If the battery voltage is low, diagnostic trouble codes will
not be set. Check the battery if scan tool MB991958 does not
display.
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Select "Interactive Diagnosis" from the start-up screen.
4. Select "System select."
5. Choose "MFI" from the "POWER TRAIN" tab.
6. Select "MITSUBISHI."
7. Select "Diagnostic Trouble Code"
8. If a DTC is set, it is shown.
9. Choose "Erase DTCs" to erase the DTC.

PROVISIONAL DTCs [SCAN TOOL MB991958
OBD-II Test Mode - Results (Mode 5)]

The scan tool will display the Provisional DTCs reported by
PCM if the PCM detects some malfunction for "Misfire", "Fuel
System" and "Comprehensive" monitoring during a SINGLE
Driving Cycle. The intended use of this data is to assist the
technician after a vehicle repair, and after clearing diagnostic
information, by reporting test result after a SINGLE Driving
Cycle. Note that the test results reported by this mode do not
necessarily indicate a faulty component/system. If test results
indicate a failure after ADDITIONAL (consecutive) driving, then
the Malfunction Indicator Lamp (SERVICE ENGINE SOON or
Check Engine Lamp) will be illuminated and a DTC will set.

AK303629AB

MB991911

MB991827

MB991824

16-PIN

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-10

MODE 6 REFERENCE TABLE

The powertrain control module (PCM) monitors the condition of emission control system.
By selecting MODE 6 using scan tool, Test Result and Limit Value (minimum) *1 or (maximum) *2 about the
main items of emission control system which PCM monitors can be confirmed. The value at the last monitor-
ing is output by PCM as a test result.

TEST
ID

MONITORING
ITEM

SIMPLE TECHNICAL
DESCRIPTION

INDICATION OF SCAN
TOOL

CONVERSION
COEFFICIENT IN
USING
GENERAL SCAN
TOOL

Catalyst
monitor (Bank
1)

PCM monitors the deterioration of
catalyst at right bank side by the
output frequency ratio between
right bank heated oxygen sensor
(front) and right bank heated
oxygen sensor (rear).

Catalyst Frequency
Ratio Bank 1
Test Result and Limit
Value (max.)

× 0.0039

Catalyst
monitor (Bank
2)

PCM monitors the deterioration of
catalyst at left bank side by the
output frequency ratio between left
bank heated oxygen sensor (front)
and left bank heated oxygen sensor
(rear).

Catalyst Frequency
Ratio Bank 2
Test Result and Limit
Value (max.)

× 0.0039

EGR monitor

PCM monitors the operation of
EGR system by the pressure
difference of intake manifold
between before and after
introduction of EGR using the
manifold absolute pressure sensor.

EGR Monitor Pressure
Value
Test Result and Limit
Value (min.) kPa

× 0.43 kPa

Evaporation
leak monitor
(Small leak)

PCM monitors the leak of fuel
evaporation gas by the reduction of
vacuum in tank after appointed time
using the fuel tank differential
pressure sensor after making the
fuel tank and the fuel line vacuum.

EVAP Leak Mon. 1mm
Pressure Value
Test Result and Limit
Value (max.) kPa

× 0.032 kPa

Evaporation
leak monitor
(Gross leak)

PCM monitors the leak of fuel
evaporation gas by checking
whether the pressure can be
reduced (the amount of pressure
reduction) using the fuel tank
differential pressure sensor after
sealing the fuel tank and the fuel
line.

EVAP Leak Mon. Gross
Pressure Value
Test Result and Limit
Value (min.) kPa

× 0.032 kPa

Evaporation
leak monitor
(Very small
leak)

EVAP Leak Mon.
0.5mm Pressure Value
Test Result and Limit
Value (max.) kPa

× 0.032 kPa

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-11

NOTE: *1 : Minimum value: The test fails if test value is less than this value.
NOTE: *2 : Maximum value: The test fails if test value is greater than this value.

DIAGNOSTIC BY DIAGNOSTIC TEST MODE II
(INCREASED SENSITIVITY)

Required Special Tools:

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

• MB991824: V.C.I

• MB991827: USB Cable

• MB991911: Main Harness B

Right bank
heated oxygen
sensor (front)
monitor
(Rich/lean
switching)

PCM monitors the deteriorated
condition of the right bank heated
oxygen sensor (front) by checking
the lean/rich switching frequency of
the right bank heated oxygen
sensor (front).

HO2S B1 SENSOR1
Rich/Lean Switching
Count
Test Result and Limit
Value (min.)

× 1 time

Left bank
heated oxygen
sensor (front)
monitor
(Rich/lean
switching)

PCM monitors the deteriorated
condition of the left bank heated
oxygen sensor (front) by checking
the lean/rich switching frequency of
the left bank heated oxygen sensor
(front).

HO2S B2 SENSOR1
Rich/Lean Switching
Count
Test Result and Limit
Value (min.)

× 1 time

Right bank
heated oxygen
sensor (rear)
monitor
(Voltage)

PCM checks the output voltage of
the right bank heated oxygen
sensor (rear) in order to monitor
whether the heated right bank
oxygen sensor (rear) output is
stuck.

HO2S B1 SENSOR2
Change in Volt
Test Result and Limit
Value (min.)

× 19.5 mV

Left bank
heated oxygen
sensor (rear)
monitor
(Voltage)

PCM checks the output voltage of
the left bank heated oxygen sensor
(rear) in order to monitor whether
the left bank heated oxygen sensor
(rear) output is stuck.

HO2S B2 SENSOR2
Change in Volt
Test Result and Limit
Value (min.)

× 19.5 mV

TEST
ID

MONITORING
ITEM

SIMPLE TECHNICAL
DESCRIPTION

INDICATION OF SCAN
TOOL

CONVERSION
COEFFICIENT IN
USING
GENERAL SCAN
TOOL

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-12

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.
NOTE: When mode II is selected with scan tool MB991958
(MUT-III sub assembly), the Malfunction Indicator Lamp (SER-
VICE ENGINE SOON or Check Engine Lamp) will light when
the powertrain control module (PCM) first detects the trouble
(Note that this is only for emission-related trouble). At the same
time, the relevant diagnostic trouble codes will be registered. In
respect to the comprehensive component electrical faults
(opens/shorts), the time for the diagnostic trouble code to be
registered after the fault occurrence is four seconds " one sec-
ond. Therefore, the confirmation of the trouble symptom and
the confirmation after completing repairs can be reduced. To
return to the normal mode I after mode II has been selected
once, the ignition switch must be turned "OFF" once or mode I
must be reselected with scan tool MB991958 (MUT-III sub
assembly). The diagnostic trouble code, system readiness test
status and freeze frame data, etc., will be erased when mode I
is returned to, so record these before returning to mode I.
1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Change the diagnostic test mode of the powertrain control

module to DIAGNOSTIC TEST MODE II (INCREASED
SENSITIVITY).

4. Road test the vehicle.
5. Read the diagnostic trouble code and repair the

malfunctioning part.

6. Turn the ignition switch to the "LOCK" (OFF) position.
7. Disconnect scan tool MB991958 from the data link

connector.

INSPECTION USING SCAN TOOL MB991958,
DATA LIST AND ACTUATOR TESTING

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

AK303629AB

MB991911

MB991827

MB991824

16-PIN

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