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)

13A-20

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