Mitsubishi Galant (2004+). Manual - part 1323

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-985

STEP 10. Check harness connector B-03 or B-04 or B-01 at 
right bank injector for damage.

(1) Check the injector connector, which deviates from the 

standard value at Step 9.

Q: Is the harness connector in good condition?

YES : Repair harness wire between injector intermediate 

connector and right bank injector connector because 
of harness damage. Then confirm that the 
malfunction symptom is eliminated.

NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then confirm that the 

malfunction symptom is eliminated.

STEP 11. Check harness connector B-32 at intermediate 
connector for damage.

Q: Is the harness connector in good condition?

YES : Go to Step 12.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then confirm that the 

malfunction symptom is eliminated.

STEP 12. Check harness connector B-27, B-26, B-30 at left 
bank injector for damage.

Q: Is the harness connector in good condition?

YES : Go to Step 13.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

.Then confirm that the 

malfunction symptom is eliminated.

AK303055

M

1

2

CONNECTOR: B-01, B-03, B-04

AB

B-01 (GR)

B-03 (GR)

B-04 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK303053

3

4

5

8

9

1

2

6

7

10

CONNECTOR: B-32

HARNESS CONNECTOR:
COMPONENT SIDE

AB

B-32 (B)

AK303075

M

1

2

CONNECTOR: B-26, B-27, B-30

B-30 (GR)

B-27 (GR)

B-26 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-986

STEP 13. Check harness connector B-23 at PCM for 
damage.

Q: Is the harness connector in good condition?

YES : Go to Step 14.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then confirm that the 

malfunction symptom is eliminated.

127 126 125 124 123 122 121

133 132 131 130 129 128

140 139 138 137 136 135 134

146 145 144 143 142 141

153 152 151 150 149 148 147

AK303058

HARNESS CONNECTOR: 
COMPONENT SIDE

CONNECTOR: B-23

B-23

PCM

AB

AIR CLEANER

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-987

STEP 14. Check for harness damage between injector 
connector and PCM connector.

a. Check the harness wire between injector connector 

B-01 (terminal No. 2) and PCM connector B-23 (terminal 
No. 153) at No. 1 cylinder injector.

b. Check the harness wire between injector connector 

B-30 (terminal No. 2) and PCM connector B-23 (terminal 
No. 146) at No. 2 cylinder injector.

c. Check the harness wire between injector connector 

B-03 (terminal No. 2) and PCM connector B-23 (terminal 
No. 140) at No. 3 cylinder injector.

d. Check the harness wire between injector connector 

B-27 (terminal No. 2) and PCM connector B-23 (terminal 
No. 139) at No. 4 cylinder injector.

e. Check the harness wire between injector connector 

B-04 (terminal No. 2) and PCM connector B-23 (terminal 
No. 133) at No. 5 cylinder injector.

f. Check the harness wire between injector connector 

B-26 (terminal No. 2) and PCM connector B-23 (terminal 
No. 127) at No. 6 cylinder injector.

Q: Is the harness wire in good condition?

YES : Check the following items, and repair or replace the 

defective items.

a. Check the ignition coil and spark plugs.
b. Check if the injectors are clogged.

c. Check compression pressure.

d. Check fuel lines for clogging.
e. Check if the foreign materials (water, 

kerosene, etc.) got into fuel.

f. Check the EGR valve.

Then confirm that the malfunction symptom is 

eliminated.

NO :  Repair it. Then confirm that the malfunction symptom 

is eliminated.

AK303235

M

1

2

AB

B-30 (GR)

B-04 (GR)

B-01 (GR)

B-27 (GR)

B-03 (GR)

B-26 (GR)

CONNECTOR: B-01, B-03, B-04, B-26,B-27,
                         B-30

HARNESS CONNECTOR:
COMPONENT SIDE

127 126 125 124 123 122 121

133 132 131 130 129 128

140 139 138 137 136 135 134

146 145 144 143 142 141

153 152 151 150 149 148 147

AK303058

HARNESS CONNECTOR: 
COMPONENT SIDE

CONNECTOR: B-23

B-23

PCM

AB

AIR CLEANER

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-988

INSPECTION PROCEDURE 7: Hard Starting

.

COMMENT

• In cases such as the above, the cause is usually 

either weak spark, improper air-fuel mixture or 
low compression.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this case:)

• Malfunction of the ignition system.

• Malfunction of the injector system.

• Poor fuel quality. (Contamination)

• Poor compression.

• Dirtiness around throttle valve.

• Malfunction of the EGR valve.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

STEP 1. Check the battery positive voltage.
(1) Measure the battery positive voltage during cranking.

• The voltage is 8 volts or more.

Q: Does the voltage remain greater than 8 volts while the 

engine is cranked?
YES : Go to Step 2.
NO :  Refer to GROUP 54A, Battery 

− Battery check 

P.54A-5

.

STEP 2. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.

(3) Read the DTC.
(4) Turn the ignition switch the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Refer to Diagnostic Trouble Code Chart 

P.13B-33

. 

NO :  Go to Step 3.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827