Mitsubishi Colt Ralliart. Manual — part 744

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-301

STEP 24. Check harness between B-117 (terminal
No. 4) fuel pump relay (1) connector and B-103
(terminal No. 3) fuel pump relay (2) connector.

• Check power supply line for damage.

Q: Is the check result normal?

YES :

Go to Step 25 .

NO :

Repair.

STEP 25. Check harness between C-16 (terminal
No. 5) fuel pump connector and B-103 (terminal
No. 4) fuel pump relay (2) connector.

NOTE: Before checking harness, check intermediate
connector B-128 and repair if necessary.

• Check output line for damage.

Q: Is the check result normal?

YES :

Go to Step 26 .

NO :

Repair.

AK402109

3

2

1

4

AC

J/B side
connector

Connector: B-103, B-117
J/B (front side)

B-117

B-103

AK402112

1

2

3

4

5

AC

Connector: C-16

Harness side
connector

C-16(G)

3

2

1

4

AK402111AC

J/B side
connector

Connector: B-103
J/B (front side)

B-103

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-302

STEP 26. Check harness between C-16 (terminal
No. 4) fuel pump connector and body earth.

• Check earthing line for damage.

Q: Is the check result normal?

YES :

Replace fuel pump.

NO :

Repair.

AK402112

1

2

3

4

5

AC

Connector: C-16

Harness side
connector

C-16(G)

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-303

Inspection Procedure 23: Fan Control Relay System

OPERATION

• The battery voltage is applied to the cooling fan

control relay (LO) coil (terminal No. 1) and cool-
ing fan control relay (HI) coil (terminal No. 1) from
the ignition switch.

• The engine-ECU (terminal No. 95 and No. 96)

turns on the switch of the power transistor on the
unit, and then turns on the switch of the relay by
applying the electrical current to the cooling fan
control relay (LO) coil or cooling fan control relay
(HI) coil.

AK402838

M

3

1

2

4

3

1

2

4

1 2

3 4

R

92 93 94 95969798

77 78 79 808182838485868788899091

99

100

107 108 109 110 111112113114115116117118119120121
122 123 124 125126127128129130131132133134135136

101102103104105106

71 72

73 74

75 76

B-114

B-127

B-114

B-127

B-114

B-127

6

14

Cooling fan
control
relay (LO)

Cooling
fan
motor

J/C

B-114

Cooling fan
control
relay (HI)

Engine-ECU

B-127

B-109

B-110

L-R

R-W

R-L

B-112

B-108

3

1

4

2

1

1

R

Fusible link

3

40A

L

B

B

J/B

2

17

95

96

B-109

B-130

1

3

4

2

3

L-R

Ignition switch (IG2)

41

7.5A

1

3

4

2

5

2

A-08

A-20

A-31

AC

Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet

P: Purple

Cooling Fan Control Relay Circuit

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-304

• When the cooling fan control relay (LO) is in ON

position, the battery voltage is applied to the cool-
ing fan motor (terminal No. 1) from the cooling
fan control relay (LO) (terminal No. 4).

• When the cooling fan control relay (LO) and cool-

ing fan control relay (HI) are in ON position, the
battery voltage is applied to the cooling fan motor
(terminal No. 3) from the cooling fan control relay
(HI) (terminal No. 4).

FUNCTION

• When the cooling fan control relay (LO) is in ON

position, the fan motor rotates with the low speed.

• When the cooling fan control relay (LO) and the

cooling fan control relay (HI) are in ON position,
the fan motor rotates with the high speed.

PROBABLE CAUSES

• Failed cooling fan control relay

• Failed cooling fan motor

• Open/short circuit in or damage to the cooling fan

control relay circuit or loose connector contact

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-114 cooling fan
control relay (LO) connector, B-127 cooling fan
control relay (HI) connector

Q: Is the check result normal?

YES :

Go to Step 2 .

NO :

Repair or replace.

STEP 2. Check cooling fan control relay (LO) and
cooling fan control relay (HI).

• Check cooling fan control relay (Refer to GROUP

14

− On-vehicle Service − Fan Control Relay

Continuity Check

P.14-8

).

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Replace cooling fan control relay.

3

2

1

4

AK402113AC

J/B side
connector

Connector: B-114, B-127
J/B (front side)

B-114

B-127

Main

Index

Group

TOC