Mitsubishi Lancer Evolution X. Manual - part 388

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-617

STEP 5. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).
(1) Turn the ignition switch to the "ON" position.
(2) Read the DTC.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P1603 set?

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

DTC P1676: Variant Coding

.

TECHNICAL DESCRIPTION

• The ECM performs proper engine control based 

on vehicle information entered.

• A vehicle identification number (VIN) is entered at 

a plant before shipment. This diagnosis code 
occurs when no vehicle information is entered 
during ECM replacement.

.

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-618

DTC SET CONDITIONS

Logic Flow Chart

Check Condition

• Ignition switch is "ON" position.

Judgment Criterion

• Vehicle information is not entered into the ECM.

.

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:)

• 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

End

Malfunction

No

No

Coding completed

DTC & MIL

previously set

Clear DTC & MIL

AK604358

Good

No

Start

Yes

Yes

Yes

Monitoring
conditions

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-619

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 DTC P1676 set?

YES : Replace the ECM with one into which vehicle 

information is correctly entered.

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

.

DTC P2066: Fuel Level Sensor (sub) Circuit Range/Performance

.

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

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

.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-620

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 litters 
(7.9 gal), the diversity of the amount of fuel in 
tank calculated from the fuel level sensor is 2 lit-
ters (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:)

• Fuel pump module or fuel level sensor (sub) 

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