Mitsubishi Galant. Manual — part 178

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-393

COMMENT

•

If the selector lever is moved to "P" or "N" range
and the ignition switch is turned to "START"
position, battery positive voltage is supplied to
PCM (terminal 58) through the ignition switch and
park/neutral position switch. Because of this, the
PCM detects that the engine is cranking.

•

The park/neutral position switch detects the
selector lever position (P, N or other ranges) and
converts it to a voltage signal (high or low). Then
the park/neutral position switch sends that signal
to the PCM.
If the selector lever is moved to "P" or "N" range
with the ignition switch turned on (except
"START" position), continuity will exist between
the PCM and ground through the park/neutral
position switch and starter motor. The terminal

voltage of the PCM will become low. If the
selector lever is moved to the other ranges,
continuity will be lost between the PCM and
ground. The terminal voltage of the PCM will
become high.

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

•

Malfunction of the ignition switch.

•

Malfunction of the park/neutral position switch.

•

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

•

Malfunction of the PCM.

AK000638AB

CONNECTOR:B-39

AK000566AB

CONNECTOR:C-17

AK000634 AB

CONNECTOR:C-58

AK000280

CONNECTOR : C-40

PCM

AV

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-394

DIAGNOSIS

STEP 1. Check connector B-39 at park/neutral position
switch 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 park/neutral position switch.
Refer to GROUP 23A, On-vehicle Service

−

Essential Service

−

Park/neutral position switch continuity check(

P.23A-278

).

Q: Are there any abnormalities?

YES : Go to Step 3.
NO : Repair or replace it. Then confirm that the malfunction

symptom is eliminated.

STEP 3. Check the power supply voltage at park/neutral
position switch connector B-39.
(1) Disconnect the connector B-39 and measure at the harness

side.

(2) Turn the ignition switch to the "START" position.
(3) Measure the voltage between terminal 10 and ground.

•

Voltage should be battery positive voltage.

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

Q: Is the voltage normal?

YES : Go to Step 4.
NO : Check connector C-17 at intermediate connector for

damage, and repair or replace as required. Refer to
GROUP 00E, Harness Connector Inspection (

P.00E-

2

). If intermediate connector is in good condition,

repair harness wire between ignition switch connector
C-58 terminal 5 and park/neutral position switch
connector B-39 terminal 10 because of open circuit.
Then confirm that the malfunction symptom is
eliminated.

AK000638AB

CONNECTOR:B-39

AK000386

6 5 4 3 2 1

7

8

9

10

AC

B-39 HARNESS
SIDE CONNECTOR

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-395

STEP 4. Check connector C-40 at PCM 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.

STEP 5. Check for open circuit and short circuit to ground
and harness damage between park/neutral position switch
connector B-39 terminal 9 and PCM connector C-40
terminal 58.
Q: Is the harness wire in good condition?

YES : Replace the PCM. Then confirm that the malfunction

symptom is eliminated.

NO : Repair it. Then confirm that the malfunction symptom

is eliminated.

AK000280

CONNECTOR : C-40

PCM

AV

AK000638AB

CONNECTOR:B-39

AK000280

CONNECTOR : C-40

PCM

AV

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-396

INSPECTION PROCEDURE 32 : Ignition Circuit System

AK000485

3

1 2

1 2

4

1 2 3

1

3

4 5 6

1

GREEN

3

2

4 5 6

7

2

6

3

5

1

4

BLA

CK-

WHITE

3

8

2

WHITE

WHITE

WHITE

BLA

CK-BLUE

BLA

CK

WHITE-

GREEN

BLA

CK

BLA

CK

BLA

CK-

RED

BLA

CK-

RED

BLA

CK-

RED

BLA

CK-WHITE

BLA

CK-WHITE

TO
TACHOMETER

LOCK

ACC

IG1

IGNITION
SWITCH

C-58

2

6

5

29

C-66

R

C-73
MU801331

C-40
(MU803781)

C-39
(MU803784)

43

11

12

IG2

POWERTRAIN CONTROL
MODULE(PCM)

ENGINE
SPEED
DETECTION
CONNECTOR

IGNITION
COIL 1

IGNITION
COIL 2

B-09
(MU802053)

B-23
(MU802053)

3

C-04
MU801333

B-01
(MU802724)

JUNCTION
BLOCK

ST

2

2

1

1

3

3

1

2

3

4

SPARK PLUG

IGNITOIN FAILURE SENSOR

15 16

26 27 28 29

32 33 34

17 18 19 20 21 22 23 24 25

30 31

36 37

35

38

10

11 12 13

1 2 3

4 5 6 7 8 9

14

42 43
48 49 50 51 52 53 54 55 56 57

46

45

44

58 59

60 61 62 63

64 65 66

47

41

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