Mitsubishi Galant (2004+). Manual - part 1345

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1073

STEP 14. Measure the power supply voltage at PCM 
connector B-19.

(1) Disconnect the connector B-19 and measure at the harness 

side.

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

(3) Measure the voltage between terminal No. 6 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 : Replace the PCM. Then confirm that the malfunction 

symptom is eliminated.

NO :  Check harness connectors C-29 and C-211 at 

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

P.00E-2

. If intermediate 

connectors are in good condition, repair harness wire 
between fuel pump relay 2 connector C-208 (terminal 
No. 2) and PCM connector B-19 (terminal No. 6) 
because of open circuit. Then confirm that the 
malfunction symptom is eliminated.

AK303153

4 3 2 1

7 6 5

9 8

11 10

14 13 12

18 17 16 15

CONNECTOR: B-19

PCM

AB

AIR CLEANER

HARNESS CONNECTOR: 
COMPONENT SIDE

B-19 (B)

4 3 2 1

7 6 5

9 8

11 10

14 13 12

18 17 16 15

AK303267

B-19 HARNESS 
CONNECTOR: 
COMPONENT SIDE

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1074

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

BLA

CK-RED

BLA

CK-

YELLO

W

BLA

CK-

YELLO

W

BLA

CK-

YELLO

W

AK302880

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1075

.

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-1076

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-378

.

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