Mitsubishi Lancer Evolution X. Manual - part 360

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-505

STEP 14. 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 5 

P.13A-9

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0456 set?

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

DTC P0461: Fuel Level Sensor (main) Circuit Range/Performance

.

TECHNICAL DESCRIPTION

• The fuel level sensor converts the rest of the fuel 

to a voltage and seconds 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

Detect malfunction if change of fuel level sensor out-

put voltage is small when sum of fuel injection is 
large.

.

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

.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-506

DTC SET CONDITIONS

Logic Flow Chart

.

Check Condition, Judgement Criterion

• When the fuel consumption calculated from the 

operation time of the injector amounts to 30 liters 
(7.9 gal), the diversity of the amount of fuel in 
tank calculated from the fuel level sensor is 2 
liters (0.5 gal) or less.

.

FAIL-SAFE AND BACKUP FUNCTION

• None

.

OBD-II DRIVE CYCLE PATTERN

None.

.

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

• Combination meters assembly failed.
• Fuel level sensor failed.
• ECM failed.

AK604341

Good

Malfunction

End

No

No

No

Indicated fuel level

change < 2L (0.5gal)

Reset fuel consumption accumulator 

Start

Yes

Yes

Yes

Monitoring
conditions

Accumulate fuel consumption

through fuel injectors

Accumulated fuel consumption

will not reset when key-off/on.

Accumulated fuel >= specified

consumption value

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-507

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.

STEP 2. Using scan tool MB991958, read the diagnostic 
trouble code (DTC)

1. Turn the ignition switch to the "ON" position.
2. After the DTC has been deleted, read the DTC again.
3. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is DTC P0461 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

.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-508

STEP 3. Using scan tool MB991958, read the diagnostic 
trouble code (DTC)

1. Turn the ignition switch to the "ON" position.
2. After the DTC has been deleted, read the DTC again.
3. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is DTC P0461 set?

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

DTC P0462: Fuel Level Sensor Circuit Low 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

A short 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

.