Mitsubishi Lancer Evolution X. Manual - part 409

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-701

DTC SET CONDITIONS

Lgic Flow Chart

Check Condition

• Battery positive voltage is between 10 and 16.5 

volts.

Judgement Criterion

• Unable to receive combination meter signals 

through the CAN bus line for 4 seconds.

.

COMMENT

Current Trouble

• Some of the possible causes are a harness or 

connector damage between the ECM and the 
combination meter on the CAN bus line, a failure 
in the combination meter power supply system, a 
failure in the combination meter, or a failure in the 
ECM.

AK604369

Start

Yes

Yes

Yes

No

No

No

Continuous failure

for specified time

Malfunction

End

Good

Monitoring
conditions

Communication status

fails

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-702

Past Trouble

• Proceed to troubleshoot based on a harness or 

connector damage on the CAN bus line between 
the ECM and combination meter, and a failure in 
the combination meter power supply system. 
Refer to "How to cope with past trouble" (Refer to 
GROUP 00, How to Use Troubleshooting/Inspec-
tion Service Points − How to Treat Past Trouble 

P.00-16

).

NOTE: If a malfunction occurred in the past, a failure 
cannot be discovered through the M.U.T. 

−

 III CAN 

bus diagnosis even if there might be a problem with 
the CAN bus. In this case, refer to GROUP 00, How 
to Use Troubleshooting/Inspection Service Points 

−

 

How to Cope with Intermittent Malfunctions 

P.00-15

. 

Furthermore, it is possible to narrow down the areas 
of the possible failures from the DTCs that are output 
by the ECUs, which are communicating on the CAN 
bus (Refer to GROUP 54C, CAN bus line Diagnos-
tics Flow 

P.54C-11

).

.

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:)

• CAN line harness damage or connector damage.
• Combination meter failed.
• 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, diagnose CAN bus 
line.

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) Diagnose CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line normal?

YES : Go to Step 2.
NO :  Repair the CAN bus line. Refer to GROUP 54C, Can 

Bus Diagnostics Table 

P.54C-17

. Then go to Step 4.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-703

STEP 2. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).
(1) Turn the ignition switch to the "ON" position.
(2) Read the combination meter-DTC.
(3) 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 Assembly − Diagnostic Trouble 

Code Chart 

P.54A-39

.

NO :  Go to Step 3.

STEP 3. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).
(1) Turn the ignition switch to the "ON" position.
(2) After the MFI-DTC has been deleted, read the MFI-DTC 

again.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC U1180 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-14

 or GROUP 42C, ID Codes 

Registration Judgment Table <Vehicles with WCM> 

P.42C-10

. Then go to Step 4.

NO :  It can be assumed that this malfunction is intermittent 

of CAN bus line between ECM and combination 
meter. Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points − How to 

Cope with Intermittent Malfunctions 

P.00-15

.

STEP 4. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).
(1) Turn the ignition switch to the "ON" position.
(2) After the MFI-DTC has been deleted, read the MFI-DTC 

again.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC U1180 set?

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-704

SYMPTOM PROCEDURES

Inspection procedure 1: Communication with ECM only is not possible

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AK900377

1

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5 6 7

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1 2

FUSIBLE LINK

1

C-309

8

C-317

5

4

16

4

5

7

8

10

8

80

B-10

C-317

C-301

C-309

C-127

C-104

C-131

103

90

91

4

15

5

16

J/C (CAN3)
C-127

J/C (CAN2)
C-104

4

15

6

19

9

C-301

8

21

C-131

20

C-131

ENGINE
CONTROL
MODULE

DATA LINK
CONNECTOR

C-40

ETACS-ECU

6

14

10A

RED

WHITE

ORANGE

RED-

BLA

CK

BLACK

BLA

CK

BLA

CK

BLA

CK-WHITE

PINK

YELLO

W

-BLUE

YELLO

W

-BLUE

WHITE

GREEN

YELLO

W

-

GREEN

GREEN-

WHITE

YELLO

W

-

GREEN

YELLO

W

RED-

BLA

CK

GREEN

34

5

ANALOG
INTERFACE
CIRCUIT

ANALOG
INTERFACE
CIRCUIT

CAN DRIVE
CIRCUIT

CAN DRIVE
CIRCUIT

INTERFACE
CIRCUIT

INTERFACE
CIRCUIT

AB

CAN COMMUNICATION CIRCUIT <M/T>

BLA

CK