Mitsubishi Galant (2004+). Manual - part 1059

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1053

.

AK303936

B-101 (GR)

B-102 (GR) B-117 (GR)

B-118 (GR)

AB

CONNECTORS: B-101, B-102, B-117, B-118

IGNITION COIL

AK303918AB

C-29

CONNECTOR: C-29

AK303059

CONNECTOR: B-23

PCM

AB

AIR CLEANER

B-23

AK303925AB

CONNECTOR: C-215

C-215

AK303923AB

CONNECTOR: C-308

C-308

AK303915AB

CONNECTOR: C-211

C-211

AK303872AB

A-13 (GR)

CONNECTOR: A-13

AK303937 AB

CONNECTOR: B-111

B-111 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1054

CIRCUIT OPERATION

• The ignition coil is energized by battery positive 

voltage from the ignition switch.

• When the PCM turns off its internal power tran-

sistor, battery positive voltage is applied to the 
ignition power transistor (terminal No. 3) inside 
the ignition coil, causing the ignition power tran-
sistor to be turned on.

• If the ignition power transistor is turned on, the 

primary circuit of the ignition coil is energized by 
grounding the ignition coil through terminal No. 2, 
causing the primary current to flow to the ignition 
coil.

.

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

• Malfunction of the ignition coil.

• Malfunction of the ignition power transistor.

• Improper connector contact, open circuit or 

shorted harness wire.

• Malfunction of the PCM.

DIAGNOSIS

STEP 1. Check the ignition coil.
Refer to GROUP 16, Ignition System 

− On-vehicle service − 

Ignition Coil Check 

P.16-37

.

Q: Are there any abnormalities?

YES : Replace the ignition coil. Then confirm that the 

malfunction symptom is eliminated.

NO :  Go to Step 2.

STEP 2. Check harness connector B-101, B-102, B-117 and 
B-118 at ignition coil for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 3.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then confirm that the 

malfunction symptom is eliminated.

1

2

3

AK303919

B-101(GR)

B-102 (GR) B-117 (GR)

B-118 (GR)

CONNECTORS: B-101, B-102, B-117, B-118

HARNESS CONNECTOR:
COMPONENT SIDE

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1055

STEP 3. Measure the power supply voltage at ignition coil 
connectors B-101, B-102, B-117 and B-118.
(1) Disconnect the connector B-101, B-102, B-117 and B-118 

and measure at the harness side.

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

(3) Measure the voltage between terminal No. 1 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 5.
NO :  Go to Step 4.

1

2

3

AK303919

B-101(GR)

B-102 (GR) B-117 (GR)

B-118 (GR)

CONNECTORS: B-101, B-102, B-117, B-118

HARNESS CONNECTOR:
COMPONENT SIDE

AB

AK302146

1

2

3

B-101, B-102 , B-117 , B-118
HARNESS CONNECTORS:
COMPONENT SIDE

AD

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1056

STEP 4. Check for open circuit between ignition switch 
connector C-308 (terminal No. 2) and ignition coil 
connectors B-101, B-102, B-117 and B-118 (terminal No. 1).

NOTE: Check harness after checking intermediate connectors 
A-13, C-29, C-211, C-215 and C-308. If intermediate connec-
tors are damaged, repair or replace them. Refer to GROUP 
00E, Harness Connector Inspection 

P.00E-2

. Then confirm that 

the malfunction symptom is eliminated.
Q: Is the harness wire in good condition?

YES :  Repair harness wire between ignition switch 

connector C-308 (terminal No. 2) and capacitor 
connector B-111 (terminal No. 1) because of short 
circuit to ground. Then confirm that the malfunction 
symptom is eliminated.

NO :  Repair it. Then confirm that the malfunction symptom 

is eliminated.

AK303938

1

2

3

4

5

6

AB

CONNECTOR: C-308

C-308

HARNESS 
CONNECTOR:
COMPONENT SIDE

1

2

3

AK303919

B-101(GR)

B-102 (GR) B-117 (GR)

B-118 (GR)

CONNECTORS: B-101, B-102, B-117, B-118

HARNESS CONNECTOR:
COMPONENT SIDE

AB