Mitsubishi Evolution X. Manual — part 260

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-17

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. Select "System select."
4. Choose "from 2006 MY" under "MODEL YEAR".
5. Check that "Vehicle Information" contents are correct.
6. Choose "MFI".
7. Select "Actuator Test."
8. Choose an appropriate item and select the "OK" button.

HOW TO DIAGNOSE THE CAN BUS LINES

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-18

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. Select "CAN bus diagnosis" from the start-up screen.
4. When the vehicle information is displayed, confirm that it

matches the vehicle whose CAN bus lines will be
diagnosed.

• If they matches, go to step 8.

• If not, go to step 5.

5. Select the "view vehicle information" button.
6. Enter the vehicle information and select the "OK" button.
7. When the vehicle information is displayed, confirm again

that it matches the vehicle whose CAN bus lines will be
diagnosed.

• If they matches, go to step 8.

• If not, go to step 5.

8. Select the "OK" button.
9. When the optional equipment screen is displayed, choose

the one which the vehicle is fitted with, and then select the
"OK" button.

PROVISIONAL DTCs [OBD-II Test Mode - Results
(Mode 7)]

The general scan tool will display the Provisional DTCs
reported by ECM if the ECM detects some malfunction for "Mis-
fire", "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) driv-
ing, then the Malfunction Indicator Lamp (SERVICE ENGINE
SOON or Check Engine Lamp) will be illuminated and a DTC
will set.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-19

MODE 6 REFERENCE TABLE

The engine control module (ECM) 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 ECM monitors can be confirmed. The value at the last monitor-
ing is output by ECM as a test result.

ON-BOARD
DIAGNOSTIC
MONITOR ID

STANDARDIZED /
MANUFACTURER
DEFIND TEST ID

MONITORING ITEM

SIMPLE TECHNICAL DESCRIPTION

CONVERSION
COEFFICIENT IN USING
GENERAL SCAN TOOL

01

81

Oxygen Sensor Monitor
Bank 1

− Sensor 1

Rich/Lean Switching
frequency

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

× 1 count

02

08

Oxygen Sensor Monitor
Bank 1

− Sensor 2

Maximum Sensor Voltage
for Test Cycle

ECM checks the output
voltage of the heated oxygen
sensor (rear) in order to
monitor whether the heated
oxygen sensor (rear) outputs
the rich signal.

× 0.122 mV

82

Oxygen Sensor Monitor
Bank 1

− Sensor 2

Output Voltage change

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

× 0.122 mV

05

Oxygen Sensor Monitor
Bank 1

− Sensor 2

Rich To Lean Sensor Switch
Time

ECM checks the rich to lean
switching time of the heated
oxygen sensor (rear) in order
to monitor the response of the
heated oxygen sensor (rear).

× 1 msec

88

Oxygen Sensor Monitor
Bank 1

− Sensor 2

Output Voltage drop slope

ECM checks the output
voltage drop slope of the
heated oxygen sensor (rear)
in order to monitor the
response of the heated
oxygen sensor (rear).

× 1 msec

21

83

Catalyst Monitor Bank 1
Frequency ratio between
Front- and Rear-Oxygen
Sensors

ECM monitors the
deterioration of catalyst by
the output frequency ratio
between heated oxygen
sensor (front) and heated
oxygen sensor (rear).

× 0.0039

39

85

EVAP Monitor (Cap off)
Pressure drop during
de-pressurizing

ECM 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.

× 0.0117 kPa

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

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3B

85

EVAP Monitor (0.040")
Pressure rise during airtight
condition

After ECM vacuumizes the
fuel tank and the fuel line and
then the specified time is
passed, ECM monitors the
leak of fuel evaporation gas
through the fuel tank
differential pressure sensor to
check the reduction of
vacuum in the fuel tank.

× 0.0117 kPa

3C

85

EVAP Monitor (0.020")
Pressure rise during airtight
condition

After ECM vacuumizes the
fuel tank and the fuel line and
then the specified time is
passed, ECM monitors the
leak of fuel evaporation gas
through the fuel tank
differential pressure sensor to
check the reduction of
vacuum in the fuel tank.

× 0.0117 kPa

A1

0B

Mis-Fire General Data
EWMA Misfire Counts For
Last 10 Driving Cycles

ECM monitors angular
acceleration of crankshaft
and detect misfire. EWMA
(Exponential Weighted
Moving Average) misfire
counts for last 10 driving
cycles.

× 1 count

0C

Mis-Fire General Data
Misfire Counts For
Last/Current Driving Cycle

ECM monitors angular
acceleration of crankshaft
and detect misfire. Misfire
counts for last/current driving
cycle.

× 1 count

A2

0B

Mis-Fire Cylinder 1 Data
EWMA Misfire Counts For
Last 10 Driving Cycles

ECM monitors angular
acceleration of crankshaft
and detect misfire. EWMA
(Exponential Weighted
Moving Average) misfire
counts for last 10 driving
cycles.

× 1 count

0C

Mis-Fire Cylinder 1 Data
Misfire Counts For
Last/Current Driving Cycle

ECM monitors angular
acceleration of crankshaft
and detect misfire. Misfire
counts for last/current driving
cycle.

× 1 count

ON-BOARD
DIAGNOSTIC
MONITOR ID

STANDARDIZED /
MANUFACTURER
DEFIND TEST ID

MONITORING ITEM

SIMPLE TECHNICAL DESCRIPTION

CONVERSION
COEFFICIENT IN USING
GENERAL SCAN TOOL