Mitsubishi Eclipse. Manual - part 227

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-401

DTC P0325: Knock Sensor Circuit

AK000662

2

1

WHITE

BL

ACK

BL

ACK

BL

ACK

C-60 <M/T>
(MU803772)

78 <M/T>
90 <A/T>

KNOCK SENSOR

2

1

     B-35
MU802661

82

78

81

80

89 90 91 92

79

87

71

74

73

72

76

75

77

85

88

83 84

86

98

78

71

88 89

76 77

72
79
91

73
80

74

75

81
92

8283
93

8485

94

8687

9596

90

97

C-57 <A/T>
(MU803782)

ENGINE CONTROL
MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL
MODULE (PCM) <A/T>

Knock Sensor Circuit

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-402

.

CIRCUIT OPERATION

• The knock sensor sends a signal voltage to the 

ECM (terminal No. 78) <M/T> or PCM (terminal 
No. 90) <A/T>.

.

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 ECM <M/T> or PCM <A/T> 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.

• ECM <M/T> failed.

• PCM <A/T> failed.

DIAGNOSIS

Required Special Tools:

• MB991958 (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

AK300049

CONNECTOR: B-35

AB

B-35 (GR)

KNOCK SENSOR

AK300060

ECM

CONNECTOR: C-60 <M/T>

AE

C-60 (G)

AK300060

PCM

CONNECTOR: C-57 <A/T>

AG

C-57 (GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-403

STEP 1. Check connector B-35 at the knock sensor for 
damage.
Q: Is the 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.

AK300401

1

2

CONNECTOR: B-35

AB

B-35 (GR)

KNOCK SENSOR

HARNESS 
CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-404

STEP 2. Check the continuity at knock sensor harness 
side connector B-35.
(1) Disconnect the connector B-35 and measure at the harness 

side.

(2) Check for the continuity between terminal No. 2 and 

ground.

• Should be less than 2 ohms.

Q: Is the continuity normal?

YES : Go to Step 3.
NO :  Repair harness wire between knock sensor connector 

B-35 (terminal No. 2) and ground because of open 
circuit or harness damage. Then go to Step 6.

AK300401

1

2

CONNECTOR: B-35

AB

B-35 (GR)

KNOCK SENSOR

HARNESS 
CONNECTOR:
COMPONENT SIDE

AKX01415

2 1

AQ

B-35 HARNESS 
CONNECTOR: 
COMPONENT SIDE