Mitsubishi Galant (2004+). Manual - part 953

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-629

(3) Measure the voltage between terminal No. 149 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 9.
NO :  Go to Step 7.

STEP 7. Check harness connector B-23 at PCM for 
damage.

Q: Is the harness connector in good condition?

YES : Go to Step 8.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 12.

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AK202963AB

POWER PLANT ECU 
CHECK HARNESS 
CONNECTOR 

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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) <2.4L ENGINE>

13A-630

STEP 8. Check for open circuit and short circuit to ground 
between evaporative emission purge solenoid connector 
B-05 (terminal No. 1) and PCM connector B-23 (terminal 
No. 149).

Q: Is the harness wire in good condition?

YES : Replace the PCM. Then go to Step 12.
NO :  Repair it. Then go to Step 12.

AK303870

1

2

AB

CONNECTOR: B-05

B-05 (B)

HARNESS 
CONNECTOR:
COMPONENT SIDE

INTAKE 
MANIFOLD

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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) <2.4L ENGINE>

13A-631

STEP 9. Check harness connector B-23 at PCM for 
damage.

Q: Is the harness connector in good condition?

YES : Go to Step 10.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 12. 

STEP 10. Check for harness damage between MFI relay 
connector B-17X (terminal No. 4) and evaporative emission 
purge solenoid connector B-05 (terminal No. 2).

Q: Is the harness wire in good condition?

YES : Go to Step 11.
NO :  Repair it. Then go to Step 12.

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

AK303806

2

1

3

4

AB

CONNECTOR: B-17X

B-17X

RELAY BOX
TRIANGLE 
MARK

HARNESS CONNECTOR:
COMPONENT SIDE

AK303870

1

2

AB

CONNECTOR: B-05

B-05 (B)

HARNESS 
CONNECTOR:
COMPONENT SIDE

INTAKE 
MANIFOLD

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-632

STEP 11. Check for harness damage between evaporative 
emission purge solenoid connector B-05 (terminal No. 1) 
and PCM connector B-23 (terminal No. 149).

Q: Is the harness wire in good condition?

YES : Replace the PCM. Then go to Step 12.
NO :  Repair it. Then go to Step 12.

STEP 12. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− OBD-II Drive Cycle − Procedure 6 − 

Other Monitor 

P.13A-5

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0443 set?

YES : Retry the troubleshooting.
NO :  The inspection is complete.

AK303870

1

2

AB

CONNECTOR: B-05

B-05 (B)

HARNESS 
CONNECTOR:
COMPONENT SIDE

INTAKE 
MANIFOLD

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