Mitsubishi Lancer Evolution X. Manual - part 382

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-593

STEP 3. 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 − Pattern 23 

P.13A-9

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P1239 set?

YES : Retry the troubleshooting.
NO :  The inspection is complete. 

DTC P1240: Ignition Angle

.

TECHNICAL DESCRIPTION

Checks for an abnormal ignition timing retard angle 
demand signal from the active stability control (ASC).

.

DTC SET CONDITIONS

Check Condition

• Ignition switch is "ON" position.

Judgment Criterion

• The ignition timing retard angle demand signal is 

not normal.

.

FAIL-SAFE AND BACKUP FUNCTION

• Ignition retard is not carried out.

.

TROUBLESHOOTING HINTS (The most 
likely causes for this code to be set are:)

• ECM failed.

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-594

STEP 1. Using scan tool MB991958, read the 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 DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the ASC-DTC set?

YES : Refer to GROUP 35C, Active Stability Control System 

− Diagnostic Trouble Code Chart 

P.35C-22

.

NO :  Replace the ECM. When the ECM is replaced, 

register the ID code. Refer to GROUP 42B, ID Code 
Registration Necessity Judgment Table <Vehicles 
with KOS> 

P.42B-11

 or GROUP 42C, ID Codes 

Registration Judgment Table <Vehicles with WCM> 

P.42C-9

.

DTC P1241: Torque Monitor

.

TECHNICAL DESCRIPTION

Compares the actual torque signal computed from a 
mass air flow sensor signal with the driver demand 
torque signal computed from an accelerator pedal 
position sensor signal.

.

MONITOR EXECUTION

Continuous

.

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)

• Not applicable

.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

AK704227

Connector: B-09

ECM

B-09 (GR)

AB

AK704247AB

Connector: B-11

B-11 (B)

Radiator cap

Throttle body assembly
(incorporating throttle
position sensor)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-595

DTC SET CONDITIONS

Logic Flow Chart

Check Conditions

• Engine speed is 500 r/min or higher.
• Volumetric efficiency is 16 percent or higher.

Judgement Criterion

• The actual torque signal has continued to be 

more than the requested torque signal by 130 
N⋅ m (96 ft-lb) or more for 1 second.

.

FAIL-SAFE AND BACKUP FUNCTION

• Throttle opening degree position is in default 

position.

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function − OBD-II Drive Cycle − 

Pattern 16 

P.13A-9

.

.

TROUBLESHOOTING HINTS (The most 
likely causes for this code to be set are:)

• Throttle actuator control motor failed.
• Connector damage.
• Harness damage.
• Vacuum leak.
• ECM failed

AK704414

Start

Yes

Yes

Yes

No

No

No

Continuous

failure for 1sec

Malfunction

End

Good

Monitoring
conditions

Actual torque - permitted

torque > 130N·m (96ft-lb)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-596

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A

STEP 1. Using scan tool MB991958, read the 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 DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the diagnostic trouble code other than P1241 set?

YES : Refer to, Diagnostic Trouble Code Chart 

P.13A-48

. 

NO :  Go to Step 2. 

STEP 2. Using scan tool MB991958, check data list.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items in the data list. Refer to Data List 

Reference Table 

P.13A-818

.

a. Item 10: Mass Airflow Sensor.
b. Item 11: Accelerator Pedal Position Sensor (main).

c. Item 12: Accelerator Pedal Position Sensor (sub).

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are they operating properly?

YES : Go to Step 3.
NO :  Repair or replace it. Then go to Step 9.

STEP 3. Check harness connector B-11 at throttle actuator 
control motor and harness connector B-09 at ECM for 
damage.
Q: Is the harness connector in good condition?

YES : Go to Step 4.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 9.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB