Mitsubishi Outlander GS45X. Manual - part 969

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-809

STEP 7. Measure the power supply voltage at ECM harness 
side connector B-11.
(1) Disconnect the connector B-11 and measure at the harness 

side.

(2) Measure the voltage between terminal No. 73 and ground.

• Voltage should be battery positive voltage.

Q: Is battery positive voltage (approximately 12 volts) 

present?
YES : Go to Step 8.
NO :  Repair harness wire between MFI relay connector 

A-33X (terminal No. 1) and ECM connector B-11 
(terminal No. 73) because of open circuit. Then 
confirm that the malfunction symptom is eliminated.

STEP 8. Check for open circuit and harness damage 
between MFI relay connector A-33X (terminal No. 2) and 
ECM connector B-11 (terminal No. 82).
(1) Disconnect the connector A-33X and B-11 measure at the 

harness side.

(2) Measure the resistance between connector A-33X (terminal 

No. 2) and connector B-11 (terminal No. 82).

• Should be less than 2 ohms.

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 Codes 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.

82 81 80 79 78 77 76 75 74 73 72 71

94 93 92 91 90 89 88 87 86 85 84 83

99 98 97 96 95

100

101

102

103

104

105

106

112

113

114

109 108

107

110

111

115

116

117

118

AK700214 AB

B-11 harness
connector:
component side 

AK704118

82 81 80 79 78 77 76 75 74 73 72 71

94 93 92 91 90 89 88 87 86 85 84 83

99 98 97 96 95

100

101

102

103

104

105

106

112

113

114

109 108

107

110

111

115

116

117

118

3

1

2

4

AB

B-11 harness
connector:
component side 

A-33X harness
connector:
component side

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-810

INSPECTION PROCEDURE 22: 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

AK703907

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

R

IG2

ST

LOCK

ACC

IG1

2

TO ECM

5

M

4

BLUE

1

C-314

MU801323

1

C-307

MU801325

6

C-317

PINK

FUEL PUMP
MODULE

D-20

(MU802058)

FUEL PUMP RELAY

B-11

11

96

C-304

15A

A-33X

4

3

1

2

23

OFF

ON

OFF

ON

FUEL PUMP CIRCUIT

WHITE

IGNITION SWITCH

C-210

AB

WHITE

FUSIBLE LINK

WHITE

GREEN

36

ETACS-ECU

ENGINE
CONTROL
MODULE

MFI
RELAY

RELAY BOX
(ENGINE COMPARTMENT)

BLA

CK

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-811

.

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. 1) 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.

• Improper connector contact, open or short-circu-

lated harness wire.

• Malfunction of the ECM.

AK900601

Connector: C-210

C-210

AB

AK700446

AB

Fuel pump module

D-20 (GR)

Connector: D-20

AK700399AB

MFI relay

A-33X

Connector: A-33X

AK700444AB

ETACS-ECU

C-317

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

C-304

C-307 (B)

C-314

AK700402AB

ECM

B-11 (GR)

Connector: B-11

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-812

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 harness connector C-304, C-307, C-314 and 
C-317 at MFI relay for damage.
Q: Is the connector in good condition?

YES : Go to Step 2.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then confirm that the 

malfunction symptom is eliminated.

STEP 2. Check the fuel pump relay.
Refer to On-vehicle Service 

− Fuel Pump Relay Continuity 

Check 

P.13B-887

.

Q: Is the measured resistance normal?

YES : Go to Step 3.
NO :  Replace the fuel pump relay. Then confirm that the 

malfunction symptom is eliminated.

STEP 3. Measure the power supply voltage at ETACS-ECU 
harness side connector C-307.
(1) Disconnect the connector C-307 and measure at the 

harness side.

(2) Measure the voltage between terminal No. 1 and ground.

• Voltage should measure battery positive voltage.

Q: Is battery positive voltage (approximately 12 volts) 

present?
YES : Go to Step 4.
NO :  Repair harness wire between relay box and 

ETACS-ECU connector C-307 (terminal No. 1) 
because of open circuit. Then confirm that the 
malfunction symptom is eliminated.

STEP 4. Check connector D-20 at fuel pump for damage.
Q: Is the connector in good condition?

YES : Go to Step 5.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then confirm that the 

malfunction symptom is eliminated.

1

2

AK700216AB

C-307 harness
connector:
component side