Mitsubishi Galant. Manual — part 313

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-477

INSPECTION PROCEDURE 31: Ignition Switch-ST System and Park/Neutral Position Switch System.

AK000527

7

10

5

3

1 2

4

6

9

4 5 6

1 2 3

8

BLA

CK-RED

BLA

CK-

YLELO

W

BLA

CK-

YLELO

W

ACC

C-58

R

IGNITION
SWITCH

IG2

IG1

ST

LOCK

5

POWERTRAIN
CONTROL
MODULE(PCM)

58

PARK/ NEUTRAL
POSITION
SWITCH

B-39
MU802355

L

2

3

D

N

R

P

10

9

16

C-17

7 8

5

3 4

35

34

10 11 12

2122 23 24

13 14 15

25 26 27

16

28

17

18 19 20

29

30 31

32 33

36 37

38

9

1 2

6

C-40
(MU803781)

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

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-478

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.

AK000620AC

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) <3.0L>

13B-479

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-280

).

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.

AK000620AC

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) <3.0L>

13B-480

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

AK000620AC

CONNECTOR:B-39

AK000280

CONNECTOR : C-40

PCM

AV