Mitsubishi Galant (2004+). Manual - part 929

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-533

STEP 3. Check the compression.

Refer to GROUP 11A, On-Vehicle Service 

− Compression 

Pressure Check 

P.11A-16

.

Q: Are there any abnormalities?

YES : Repair or replace it. Then go to Step 5.
NO :  Go to Step 4.

STEP 4. Check the trouble symptoms.
(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 P0304 set?

YES : Replace the PCM. Then go to Step 5.
NO :  It can be assumed that this malfunction is intermittent. 

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

P.00-6

.

STEP 5. 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 P0304 set?

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-534

DTC P0325: Knock Sensor Circuit

CAUTION

If DTC P0325 has been set, TCL related DTC 
U1120 is also set. After P0325 has been diag-
nosed, don't forget to erase DTC U1120.

2

1

AK303854

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

WHITE

BLA

CK

BLA

CK

59

KNOCK SENSOR

2

1

B-120

MU802661

B-21

POWERTRAIN CONTROL
MODULE (PCM) 

Knock Sensor Circuit

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-535

.

CIRCUIT OPERATION

• The knock sensor sends a signal voltage to the 

PCM (terminal No. 59).

.

TECHNICAL DESCRIPTION

• The knock sensor converts the vibration of the 

cylinder block into a voltage and outputs it. If 
there is a malfunction of the knock sensor, the 
voltage output will not change.

• The PCM checks whether the voltage output 

changes.

.

DTC SET CONDITIONS

Check Conditions

• 2 seconds or more have passed since the start-

ing sequence was completed.

• Engine speed is higher than 2,500 r/min.

Judgment Criteria

• Knock sensor output voltage (knock sensor peak 

voltage in each 1/2 turn of the crankshaft) has not 
changed more than 0.06 volt in the last consecu-
tive 200 periods.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this code to be set are:)

• Knock sensor failed.

• Open or shorted knock sensor circuit, harness 

damage or connector damage.

• PCM failed.

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

AK303855AB

CONNECTOR: B-120

KNOCK SENSOR

INTAKE 
MANIFOLD

INTAKE 
MANIFOLD

B-120 (GR)

AK303119

CONNECTOR: B-21

PCM

AB

AIR CLEANER

B-21

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-536

STEP 1. Check harness connector B-120 at the knock 
sensor 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 go to Step 6.

AK303856

1

2

AB

CONNECTOR: B-120

KNOCK SENSOR

B-120 (GR)

HARNESS 
CONNECTOR:
COMPONENT SIDE

INTAKE 
MANIFOLD

INTAKE 
MANIFOLD