Mitsubishi Lancer Evolution X. Manual - part 410

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-705

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AK900378

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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

A-14

A-13

C-104

C-131

103

5

16

14

11

12

9

22

16

5

7

20

3

90

91

J/C (CAN4)

A-14

J/C (CAN2)
C-104

4

15

6

19

9

C-301

8

21

C-131

20

C-131

ENGINE CONTROL MODULE

J/C 
(CAN 3) 
C-127

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

GREEN

GREEN

PINK

GREEN-WHITE

GREEN-

WHITE

PINK

YELLO

W

YELLO

W

YELLO

W

-

GREEN

YELLO

W

-

GREEN

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 <TC-SST>

BLA

CK

A-13

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-706

.

CIRCUIT OPERATION

• Battery voltage is applied to the diagnosis con-

nector (terminal No. 16).

• The diagnosis connector (terminal No. 4 and No. 

5) is grounded to the vehicle body.

.

COMMENT

• When the communication between M.U.T.-III and 

ECM is impossible, it can be suspected that the 
CAN bus line, power supply circuit of the diagno-
sis connector, and/or grounding circuit are defec-
tive.

• Communication can not be achieved either, if a 

wrong vehicle type is selected on M.U.T.-III.

.

AK704342 AB

Connectors: A-13, A-14

A-14

A-13

AK704235 AB

Connector: B-10

ECM

B-10 (GR)

AK704343AB

Hood lock release
handle

Connector: C-40

C-40 (B)

Data link connector

AK704344 AB

Connector: C-104

C-104

AK704345AB

Connector: C-127

C-127

AK704346

AB

Connector: C-131

C-131

AK704347AB

Connectors: C-301, C-309 and C-317

ETACS-ECU

C-301

C-309 (B)

C-317

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-707

TROUBLESHOOTING HINTS (The most 
likely causes for this case:) 

• Malfunction of the data link connector.

• Open/short circuit or poor contact in the data link 

connector.

• Malfunction of the CAN communication.
• Malfunction of the scan tool.
• Malfunction of the ECM.

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. Check the vehicle communication interface (V.C.I.) 
MB991824 operations.
(1) Connect the Scan tool to the data link connector.
(2) When the power of V.C.I. is turned to ON, the indicator lamp 

of the V.C.I. illuminates in green.

• The indicator lamp of the V.C.I. illuminates in green.

Q: Is the indicator lamp of the V.C.I. illuminates in green?

YES : Go to Step 2.
NO :  Use scan tool, perform CAN bus line diagnosis.

STEP 2. Measure the battery positive voltage.
(1) Measure the battery positive voltage during cranking.

• The voltage should be 8 volts or more.

Q: Is the measured voltage 8 volts or more?

YES : Go to Step 3.
NO :  Check the battery. Refer to GROUP 54A, Battery − 

On-vehicle Service − Battery Test 

P.54A-12

. Then 

confirm that the malfunction symptom is eliminated.

STEP 3. Check harness connector C-40 at data link 
connector 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 confirm that the 

malfunction symptom is eliminated.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-708

STEP 4. Measure the power supply voltage at data link 
connector C-40.
(1) Measure voltage between terminal No. 16 and ground.

• Voltage should be battery positive voltage.

Q: Is battery positive voltage (approximately 12 volts) 

present?
YES : Go to Step 5.
NO :  Repair an open circuit between ETACS-ECU 

connector C-317 (terminal No. 8) and data link 
connector C-40 (terminal No. 16). Then confirm that 
the malfunction symptom is eliminated.

STEP 5. Check the continuity at data link connector C-40.
(1) Check for the continuity between terminal No. 4, No. 5 and 

ground.

• Should be less than 2 ohms.

Q: Does continuity exist?

YES : Check and replace the scan tool. Then confirm that 

the malfunction symptom is eliminated.

NO :  Repair an open circuit or harness damage between 

data link connector C-40 (terminal No. 4, No. 5) and 
ground. Then confirm that the malfunction symptom is 
eliminated.

Inspection procedure 2: The malfunction indicator lamp (SERVICE ENGINE SOON or check engine 
lamp) does not illuminate right after the ignition switch is turned to the "ON" position

.

CIRCUIT OPERATION

• The combination meter causes the malfunction 

indicator lamp (SERVICE ENGINE SOON or 
Check Engine Lamp) to illuminate immediately 
after the ignition switch is turned to the "ON" posi-
tion occurred.

.

TROUBLESHOOTING HINTS (The most 
likely causes for this case:) 

• Malfunction of the malfunction indicator lamp 

(SERVICE ENGINE SOON or Check Engine 
Lamp).

• Open or shorted malfunction indicator lamp 

(SERVICE ENGINE SOON or Check Engine 
Lamp) circuit.

AK604031

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16

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10

9

AC

C-40 harness
connector:
component side 

AK604032

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16

15

14

13

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10

9

AC

C-40 harness
connector:
component side