Mitsubishi Outlander XL. Manual - part 403

INSPECTION PROCEDURE 21: Power supply system and ignition switch - IG system.

M11310100304USA0000010000

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

ZK602870

1 2 3
4 5 6

1

6

4

5

9

8

10 11

13

15

14

12

16

7

2 3

1 2 3 4

5 6 7

15

14

13

12

11

10

9

8

R

IG2

ST

LOCK

ACC

IG1

93

81

20A

WHITE

WHITE

WHITE

A-33X

MFI
RELAY

4

3

1

2

6

ETACS-ECU

C-304

C-317

10

22

7.5A

2

OFF

ON

POWER SUPPLY AND IGNITION SWITCH-IG CIRCUIT

RELAY BOX
(ENGINE COMPARTMENT)

WHITE

WHITE-BLUE

RED-BLA

CK

RED-WHITE

73

104

82

GND

GND

92

B-11

IGNITION SWITCH

2

BATTERY
BACKUP

POWER 
SOURCE

AA00

ENGINE CONTROL MODULE

BLA

CK

BLA

CK

BLACK

C-210

FUSIBLE LINK

36

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

13Ab-807

SYMPTOM PROCEDURES

ZK603638AA00

C-210

Connector: C-210

ZK603592

ECM

B-11 (GR)

Connector: B-11

AA00

ZK603608 AA00

ETACS-ECU

C-317

Connectors: C-304, C-317

C-304

ZK603589

MFI relay

A-33X

Connector: A-33X

AA00

 

CIRCUIT OPERATION

｠

Battery positive voltage is applied to the MFI relay
(terminals No. 3, No. 4).

｠

When  the  ignition  switch  is  turned  to  the  "ON"
position,  battery  positive  voltage  is  applied  to  the
ECM  (terminal  No.  92).  When  battery  positive
voltage  is  applied,  the  ECM  turns  the  power
transistor  in  the  ECM  "ON"  and  grounds  the  MFI

relay coil. With this, the MFI relay turns "ON" the
battery  positive  voltage  is  supplied  to  the  ECM
(terminals No. 82) from the MFI relay (terminal No.
2).

｠

A battery positive voltage is constantly supplied to
the ECM (terminal No. 104) as the backup power.

｠

The ECM (terminals No. 81, No. 93) is grounded to
the vehicle body.

13Ab-808

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

SYMPTOM PROCEDURES

COMMENT

｠

When the ignition switch "ON" signal is input into the
ECM via ETACS-ECU, the ECM turns "ON" the MFI
relay.  This  causes  battery  positive  voltage  to  be
supplied to the ECM, sensor and actuator.

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

｠

Malfunction of the ignition switch.

｠

Malfunction of the MFI relay.

｠

Improper connector contact, open circuit or short-
circuit harness wire.

｠

Malfunction of the ECM.

 

DIAGNOSIS

STEP 1. Check harness connector A-33X at MFI relay and
harness connector B-11 at ECM 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 MFI relay.

(1)

Remove the MFI relay.

ZK603190AA00

Injector relay side
connector

1

2

3
4

(2)

Check for continuity between the MFI relay terminals No. 1
and No. 3.

｠

There should be continuity. (approximately 2 ohms)

ZK603191AA00

Injector relay
side
connector 

1

2

3
4

(3)

Use jumper wires to connect MFI relay terminal No. 1 to the
positive battery terminal and terminal No. 3 to the negative
battery terminal.

(4)

Check for continuity between the MFI relay terminals No. 2
and  No.  4  while  connecting  and  disconnecting  the  jumper
wire at the negative battery terminal.

｠

Should  be  less  than  2  ohms.  (Negative  battery  terminal
connected)

｠

Should  be  open  loop.  (Negative  battery  terminal
disconnected)

(5)

Install the MFI relay.

Q:Is the measured resistance within the specified range?

YES:

 Go to Step 3.

NO:

 Replace the MFI relay. Then confirm that the

malfunction symptom is eliminated.

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

13Ab-809

SYMPTOM PROCEDURES

STEP 3. Measure the power supply voltage at MFI relay
harness side connector A-33X.

(1)

Disconnect the connector A-33X and measure at the harness
side.

ZK603192AA00

A-33X harness

connector :
component side

4

1

3

2

(2)

Measure  the  voltage  between  terminals  No.  3,  No.  4  and
ground.

｠

Voltage should be battery positive voltage.

Q:Is  battery  positive  voltage  (approximately  12  volts)

present?

YES:

 Go to Step 4.

NO:

 Repair harness wire between fusible link (36) and MFI

relay connector A-33X (terminal No. 1, No. 2) because of
open circuit. Then confirm that the malfunction symptom
is eliminated.

STEP 4. Measure the ignition switch-IG signal voltage at
ECM harness side connector B-11.

(1)

Disconnect the connector B-11 and measure at the harness
side.

(2)

Turn the ignition switch to the "ON" position.

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

ZK603193AA00

B-11 harness
connector:
component side 

(3)

Measure the voltage between terminal No. 92 and ground.

｠

Voltage should be battery positive voltage.

(4)

Turn the ignition switch to the "LOCK" (OFF) position.

Q:Is  battery  positive  voltage  (approximately  12  volts)

present?

YES:

 Go to Step 5.

NO:

 Check harness connectors C-304 and C-317 at

intermediate connector for damage, and repair or replace
as required. Refer to, GROUP 00E, Harness Connector
Inspection P.00E-2. If intermediate connectors are in
good condition, repair harness wire between ignition
switch connector C-210 (terminal No. 2) and ECM connector
B-11 (terminal No. 92) because of open circuit. Then
confirm that the malfunction symptom is eliminated.

STEP 5. Measure the backup power supply voltage at ECM
harness side connector B-11.

(1)

Disconnect the connector B-11 and measure at the harness
side.

13Ab-810

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

SYMPTOM PROCEDURES