Mitsubishi Lancer Evolution X. Manual - part 361

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-509

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Battery positive voltage is between 11 and 16.5 

volts.

• 2 seconds or more have passed since the engine 

staring sequence was completed.

Judgement Criterion

• Fuel level sensor resistance has continued to be 

2 ohms or lower for 2 seconds.

.

FAIL-SAFE AND BACKUP FUNCTION

• None

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function − OBD-II Drive Cycle − 

Pattern 23 

P.13A-9

.

.

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

• Fuel level sensor failed.
• Combination meters assembly failed.
• Connector damage
• Harness damage
• 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

AK604342

Good

Malfunction

End

No

No

No

No

Fuel level sensor

resistance <= 2 ohms

Fuel level sensor

resistance >= 186 ohms

Start

Continuous

failure for 2secs

Monitoring
conditions

Yes

Yes

Yes

Yes

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-510

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

YES : Refer to GROUP 54A, Chassis Electrical − 

Combination Meter − Diagnosis Trouble Code Chart 

P.54A-32

NO :  Go to Step 2.

STEP 2. Check the trouble symptoms.
(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 P0462 set?

YES : 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

. Then go to Step 3.

NO :  It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points − How to 

Cope with Intermittent Malfunctions 

P.00-15

.

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 P0462 set?

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

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-511

DTC P0463: Fuel Level Sensor Circuit High Input

.

TECHNICAL DESCRIPTION

• The fuel level sensor converts the rest of the fuel 

to a voltage and sends it to the combination 
meter.

• The combination meter sends the data regarding 

the rest of the fuel to the ECM.

• The ECM checks whether this data is within a 

specified range.

.

DESCRIPTIONS OF MONITOR METHODS

An open circuit is detected while monitoring the fuel 
level sensor output.

.

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

.

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Battery positive voltage is between 11 and 16.5 

volts.

• 2 seconds or more have passed since the engine 

staring sequence was completed.

AK604342

Good

Malfunction

End

No

No

No

No

Fuel level sensor

resistance <= 2 ohms

Fuel level sensor

resistance >= 186 ohms

Start

Continuous

failure for 2secs

Monitoring
conditions

Yes

Yes

Yes

Yes

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-512

Judgement Criterion

• Fuel level sensor resistance has continued to be 

186 ohms or higher for 2 seconds.

.

FAIL-SAFE AND BACKUP FUNCTION

• None

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function − OBD-II Drive Cycle − 

Pattern 23 

P.13A-9

.

.

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

• Fuel level sensor failed.
• Combination meters assembly failed.
• Connector damage
• Harness damage
• 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

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

YES : Refer to GROUP 54A, Chassis Electrical − 

Combination Meter − Diagnosis Trouble Code Chart 

P.54A-32

NO :  Go to Step 2.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB