Mitsubishi Galant (2004+). Manual - part 1032

 

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Mitsubishi Galant (2004+). Manual - part 1032

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-945

.

CIRCUIT OPERATION

• A diagnostic output is made from the PCM (termi-

nal No. 15) to the diagnostic output terminal (ter-
minal No. 7) of the data link connector.

.

COMMENT

• No power supply to PCM.

• Defective ground circuit of PCM.

• Defective PCM.

• Improper communication line between PCM and 

scan tool.

.

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

• Malfunction of PCM power supply circuit. 

• Malfunction of the PCM. 

• Open circuit between PCM and data link connec-

tor. 

DIAGNOSIS

STEP 1. Check harness connector B-19 at PCM for 
damage.

Q: Is the harness 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.

AK303918AB

C-29

CONNECTOR: C-29

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)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-946

STEP2. Check for open circuit, short circuit to ground and 
harness damage between data link connector C-125 
(terminal No. 7) and PCM connector B-19 (terminal No. 15).

NOTE: Check harness after checking intermediate connectors 
C-29. If intermediate connector C-29 is damaged, repair or 
replace them. Refer to GROUP 00E, Harness Connector 
Inspection 

P.00E-2

. Then check that the malfunction is elimi-

nated.
Q: Is the harness wire in good condition?

YES : Refer to INSPECTION PROCEDURE 28 

− Power 

Supply System and Ignition Switch-IG System 

P.13A-1022

.

NO :  Repair it. Then confirm that the malfunction symptom 

is eliminated.

AK303916

1 2 3 4 5 6

12

11

10

1516

14

13

9

7 8

AB

CONNECTOR: C-125

HARNESS CONNECTOR:
COMPONENT SIDE

C-125 (B)

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)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-947

INSPECTION PROCEDURE 3: The Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check 
Engine Lamp) Does Not Illuminate Right after the Ignition Switch Is Turned to the "ON" Position.

.

COMMENT

• The combination meter causes the malfunction 

indicator lamp (SERVICE ENGINE SOON or 
Check Engine Lamp) to illuminate for 20 seconds 
immediately after the ignition switch is turned to 
the "ON" position occurred.

.

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

• Malfunction of the malfunction indicator lamp 

(SERVICE ENGINE SOON or Check Engine 
Lamp).

• Open or shorted malfunction indicator lamp 

(SERVICE ENGINE SOON or Check Engine 
Lamp) circuit.

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

STEP 1. 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 to the "LOCK" (OFF) position.
Q: Is DTC set?

YES : Refer to Diagnostic Trouble Code Chart 

P.13A-34

.

NO :  Go to step 2.

AK303804AB

MB991910

DATA LINK
CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-948

STEP 2. Check the trouble symptoms.

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

• The malfunction indicator lamp (SERVICE ENGINE 

SOON or Check Engine Lamp) should illuminate imme-
diately after the ignition switch is turned to the "ON" 
position.

(2) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Does the malfunction indicator lamp (SERVICE ENGINE 

SOON or Check Engine Lamp) illuminate?
YES : 
It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

P.00-6

.

NO :  Replace the combination meter.

INSPECTION PROCEDURE 4: The Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check 
Engine Lamp) Remains Illuminated and Never Goes Out.

.

COMMENT

• In cases such as the above, the cause is proba-

bly that the PCM is detecting a problem in a sen-
sor or actuator, or that one of the malfunctions 
listed at next has probably occurred.

.

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

• Shorted the malfunction indicator lamp (SER-

VICE ENGINE SOON or Check Engine Lamp) 
circuit.

DIAGNOSIS

Required Special Tools:

• Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

 

 

 

 

 

 

 

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