Mitsubishi Galant 9G. Manual — part 1205

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1120

INSPECTION PROCEDURE 30: Ignition Switch-ST System and Transmission Range Switch System

BLA

CK-

YELLO

W

BLA

CK-

YELLO

W

BLA

CK-

YELLO

W

AK400837

P

R

L

N

LOCK

ACC

5

IGNITION
SWITCH

R

IG2

IG1

ST

30

9

10

TRANSMISSION RANGE
SWITCH

POWERTRAIN
CONTROL
MODULE (PCM)

B-110

MU802355

83

3

4 5 6

1 2

C-308

C-29

A-13

Ignition Switch-ST and Transmission Range Switch Circuit

B-21

3

5 6

1 2 3 4

7

8

9 10

52

51

53 54 55 56

57

58 59 60 61 62

63

64 65 66 67 68 69

70

71 72 73 74 75

76

77 78 79 80 81 82

83

1 2

3 4 5

14

15

8 9

12 13

6 7

10 11
16 17

BLA

CK-

RED

BLA

CK-

RED

STARTING
SYSTEM

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1121

.

COMMENT

• If the selector lever is moved to "P" or "N" range

and the ignition switch is turned to "START" posi-
tion, battery positive voltage is supplied to PCM
(terminal No. 83) through the ignition switch and
transmission range switch. Because of this, the
PCM detects that the engine is cranking.

• The transmission range switch detects the trans-

mission range (P, N or other ranges) and con-
verts it to a voltage signal (high or low). Then the
transmission range 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 transmission
range switch and starter motor. The terminal volt-
age 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 termi-
nal 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 transmission range switch.

• Improper connector contact, open circuit or

short-circuit in the harness wire.

• Malfunction of the PCM.

AK303268AB

TRANSMISSION
RANGE SWITCH

CONNECTOR: B-110

B-110 (B)

AK303119

CONNECTOR: B-21

PCM

AB

AIR CLEANER

B-21

AK303148

CONNECTOR: A-13

AB

A-13(GR)

AK303231

CONNECTOR: C-29

C-29

AB

AK203191

CONNECTOR: C-308

C-308

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1122

DIAGNOSIS

STEP 1. Check connector B-110 at transmission range
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 transmission range switch.
Refer to GROUP 23A, On-vehicle Service

− Essential Service −

Transmission Range Switch Continuity Check

P.23A-372

.

Q: Are there any abnormalities?

YES : Repair or replace it. Then confirm that the malfunction

symptom is eliminated.

NO : Go to Step 3.

STEP 3. Measure the power supply voltage at transmission
range switch connector B-110.
(1) Disconnect the connector B-110 and measure at the

harness side.

(2) Turn the ignition switch to the "START" position.

(3) Measure the voltage between terminal No. 10 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 4.
NO : Check connector A-13 and C-29 at intermediate

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

P.00E-2

. If intermediate connector are in

good condition, repair harness wire between ignition
switch connector C-308 (terminal No. 5) and
transmission range switch connector B-110 (terminal
No. 10) because of open circuit. Then confirm that the
malfunction symptom is eliminated.

8

9

3

4

5

1

2

6

7

10

AK303269AB

TRANSMISSION
RANGE SWITCH

CONNECTOR: B-110

B-110 (B)

HARNESS
CONNECTOR:
COMPONENT SIDE

8

9

3

4

5

1

2

6

7

10

AK303269AB

TRANSMISSION
RANGE SWITCH

CONNECTOR: B-110

B-110 (B)

HARNESS
CONNECTOR:
COMPONENT SIDE

8

9

3

4

5

1

2

6

7

10

AK303270

B-110 HARNESS
CONNECTOR:
COMPONENT SIDE

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1123

STEP 4. Check connector B-21 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.

AK303018

55

56

54 53 52 51

57

62 61 60 59 58

63

69 68 67 66 65 64

70

75 74 73 72 71

76

82 81 80 79 78 77

83

CONNECTOR: B-21

PCM

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AIR CLEANER

B-21 (B)