Mitsubishi Galant. Manual — part 109

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-117

STEP 5. Check connector B-17, B-19, B-21, B-22 at injector
for damage.
Q: Is the connector in good condition?

YES : Go to Step 6.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 11.

STEP 6. Check the injector.
(1) Disconnect each injector connector.
(2) Measure the resistance between injector side connector

terminal 1 and 2.

Standard value: 13

−−−−

16 ohm [at 20

°°°°

C (68

°°°°

F)]

Q: Is the resistance standard value?

YES : Go to Step 7.
NO : Replace the injector. Then go to Step 11.

STEP 7. Check connector C-39, C-41 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 8.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection (

P.00E-2

). Then go to Step 11.

AK000557 AB

B-21

B-19

B-17

B-22

CONNECTORS:B-17,B-19,B-21,B-22

AK000557 AB

B-21

B-19

B-17

B-22

CONNECTORS:B-17,B-19,B-21,B-22

AK000559

2

1

INJECTOR SIDE
CONNECTOR

AB

AK000280

CONNECTORS : C-39, C-41

C-39

C-41

PCM

AZ

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-118

STEP 8. Check for harness damage between heated
oxygen sensor (front) connector B-15 terminal 4 and PCM
connector C-41 terminal 71.
Q: Is the harness wire in good condition?

YES : Go to Step 9.
NO : Repair it. Then go to Step 11.

STEP 9. Check for harness damage between injector
connector and PCM connector.

a. Check the harness wire between injector connector B-22

terminal 2 and PCM connector C-39 terminal 1 when
checking No.1 cylinder.

b. Check the harness wire between injector connector B-21

terminal 2 and PCM connector C-39 terminal 9 when
checking No.2 cylinder.

c. Check the harness wire between injector connector B-19

terminal 2 and PCM connector C-39 terminal 24 when
checking No.3 cylinder.

d. Check the harness wire between injector connector B-17

terminal 2 and PCM connector C-39 terminal 2 when
checking No.4 cylinder.

Q: Is the harness wire in good condition?

YES : Go to Step 10.
NO : Repair it. Then go to Step 11.

AK000556 AB

CONNECTOR:B-15

AK000280

CONNECTOR : C-41

PCM

AY

AK000557 AB

B-21

B-19

B-17

B-22

CONNECTORS:B-17,B-19,B-21,B-22

AK000280

CONNECTOR : C-39

PCM

AW

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-119

STEP 10. Check the fuel pressure.
Refer to, Fuel Pressure Test(

P.13A-439

).

Q: Is the fuel pressure normal?

YES : Replace the PCM. Then go to Step 11.
NO : Repair it. Then go to Step 11.

STEP 11. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to,

Procedure 6

−

Other Monitor(

P.13A-5

).

(2) Check the diagnostic trouble code (DTC).

Q: Is the DTC P0134 is output?

YES : Retry the troubleshooting.
NO : The inspection is complete.

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-120

DTC P0135: O

2

Sensor Heater Circuit Malfunction (sensor 1)

AK000465

3 4

1 2

3 4

1 2

RED-

WHITE

RED-

WHITE

RED-

WHITE

RED

BR

O

WN-WHITE

BATTERY

A-21X

3

4

1

2

HEATED OXYGEN
SENSOR(FRONT)

B-15
MU802605

1

2

3

4

TO ECM
OR PCM

TO ECM
OR PCM

POWERTRAIN CONTROL
MODULE(PCM)

3

C-39
(MU803784)

MFI
RELAY

2

3 4

5 6

7 8

9

11 12 13 14 15 16 17 18 19 20

30

21 22 23

24 25

26 27 28 29

3132 33

34 35

1

10