Mitsubishi Outlander GS45X. Manual - part 741

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-787

STEP 22. Check for harness damage between MFI relay 
connector A-33X (terminal No. 2) and ECM connector B-11 
(terminal No. 82).
Q: Is the harness wire in good condition?

YES : Replace the ECM. When the ECM is replaced, 

register the ID code. Refer to GROUP 42B, Diagnosis 
− ID Code Registration Judgment Table <Vehicles 

with KOS> 

P.42B-15

 or GROUP 42C, Diagnosis 

− ID 

Codes Registration Judgment Table <Vehicles with 
WCM> 

P.42C-10

. Then confirm that the malfunction 

symptom is eliminated.

NO :  Repair it. Then confirm that the malfunction symptom 

is eliminated.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-788

Inspection procedure 23: Fuel pump system

1

3

2

4

71 72 73 74 75 76 77 78 79 80 81 82

83 84 85 86 87 88 89 90 91 92 93 94

95 96 97 98 99

100 101 102 103 104

112 113 114

109

108

107

110 111

115 116

106

105

118

117

AK604016

1 2 3
4 5 6

1

2 3

4

5

1 2 3 4

5 6 7

15

14

13

12

11

10

9

8

1 2

1 2

1 2 3 4

5 6 7

12

11

10

15 16

14

13

9

8

M

R

IG2

ST

LOCK

IG1

2

TO ECM

5

4

BLUE

1

C-314

MU801323

C-307

MU801325

C-317

PINK

FUEL PUMP
MODULE

D-20

(MU802058)

FUEL PUMP RELAY

ETACS-ECU

B-11

11

96

C-304

BLA

CK

15A

A-33X

4

3

1

2

23

OFF

ON

OFF

ON

FUEL PUMP CIRCUIT

WHITE

IGNITION SWITCH

C-210

AC

WHITE

FUSIBLE LINK

WHITE

GREEN

36

1

6

ACC

MFI
RELAY

RELAY BOX
(ENGINE COMPARTMENT)

ENGINE
CONTROL
MODULE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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.

CIRCUIT OPERATION

• The fuel pump drive power is supplied from MFI 

relay (terminal No. 2) to fuel pump relay (C-307 
ETACS-ECU connector terminal No. 1) in the 
ETACS-ECU.

• The battery positive voltage is applied by the igni-

tion switch to the fuel pump coil (C-317 
ETACS-ECU connector terminal No. 6) in the 
ETACS-ECU. The ECM turns "ON" the relay by 
turning "ON" the power transistor in the unit so as 
to conduct power to the fuel pump relay coil (via 
the C-304 ETACS-ECU connector terminal No. 
11).

• When the fuel pump relay is turned "ON", the bat-

tery positive voltage will be supplied from the fuel 
pump relay (C-314 ETACS-ECU connector termi-
nal No. 5) to the fuel pump.

.

COMMENT

• When the ignition switch ON signal is inputted 

into the ECM, the ECM turns ON the fuel pump 
relay. This causes the battery voltage to be sup-
plied to the fuel pump.

.

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

• Malfunction of the fuel pump relay.

• Malfunction of the fuel pump.

• Open or shorted fuel pump circuit, harness dam-

age, or connector damage.

• Malfunction of the ECM.

AK704088

MFI relay

AB

Connector: A-33X

A-33X

AK704097AB

Connector: B-11

B-11 (GR)

AK900601

Connector: C-210

C-210

AB

AK700444AB

ETACS-ECU

C-317

Connectors:  C-304, C-307, 314 and C-317

C-304

C-307 (B)

C-314

AK700446

AB

Fuel pump module

D-20 (GR)

Connector: D-20

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-790

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, check actuator test 
item 9: Fuel Pump.

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) Set scan tool MB991958 to the actuator test mode for item 

9, Fuel Pump.

• An operation sound of the fuel pump should be heard.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the fuel pump operating properly?

YES : 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

.

NO :  Go to Step 2.

STEP 2. Check harness connector C-304, C-307, C-314 and 
C-317 at ETACS-ECU for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 3.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then confirm that the 

malfunction symptom is eliminated.

AK700568AB

MB991824

MB991827

MB991910

Data link
connector