Mitsubishi Outlander (2003+). Manual — part 64

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-119

Code No. P0325: Detonation Sensor System

OPERATION

œ

The sensor signal is inputted to the engine-ECU
(terminal No. 78) from the detonation sensor (ter-
minal No. 1).

FUNCTION

œ

The detonation sensor detects the vibration of the
cylinder block caused by detonation waves, and
inputs a signal to the engine-ECU.

œ

In response to the signal, the engine-ECU pro-
vides controls to retard the ignition timing when
the detonation occurs.

TROUBLE JUDGMENT

Check Condition

œ

2 seconds later after the engine has started up.

Judgment Criteria

œ

The change amount of the detonation sensor out-
put voltage (the detonation sensor peak voltage
in every one third a turn of the crankshaft) is
below 0.08 V in 200 consecutive times.

AK300273

2

1

82

78

81

80

89 90 9192

79

87

71

74

73

72

76

75

77

85

88

83 84

86

AB

78

W

B

B

Detonation sensor

2

1

B-103
(MU802661)

Engine-ECU

Detonation sensor circuit

Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet

B

C-137

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-120

PROBABLE CAUSE

œ

Failed detonation sensor

œ

Open/short circuit in detonation sensor circuit or
loose connector contact

œ

Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-103 detonation
sensor connector

Q: Is the check result normal?

YES :

Go to Step 2 .

NO :

Repair.

STEP 2. Measure resistance at B-103 detonation
sensor connector.

œ

Disconnect connector, and measure at harness
side.

œ

Resistance between terminal No. 2 and earth.

OK: 2

W

or less

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Check and repair harness between B-103

(terminal No. 2) detonation sensor
connector and body earth.

œ

Check earthing line for open circuit
and damage.

AK300274

1

2

AB

Connector: B-103

B-103 (GR)

Harness side
connector

Detonation sensor

Alternator

AK300274

1

2

AB

Connector: B-103

B-103 (GR)

Harness side
connector

Detonation sensor

Alternator

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-121

STEP 3. Connector check: C-137 engine-ECU
connector

Q: Is the check result normal?

YES :

Go to Step 4 .

NO :

Repair.

STEP 4. Check harness between B-103 (terminal
No. 1) detonation sensor connector and C-137
(terminal No.78) engine-ECU connector.

œ

Check output line for open/short circuit and dam-
age.

Q: Is the check result normal?

YES :

Go to Step 5 .

NO :

Repair.

STEP 5. Check the trouble symptoms.

Q: Does trouble symptom persist?

YES :

Go to Step 6 .

NO :

Intermittent malfunction (Refer to GROUP
00

-

How to Use

Troubleshooting/Inspection Service Points

3

00

).

AK300254

82

78

8180

89

90

91

92

79

87

71

74 73 72

76 75

77

85

88

83

84

86

AB

CONNECTOR: C-137

C-137

Harness side connector

AK300274

1

2

AB

Connector: B-103

B-103 (GR)

Harness side
connector

Detonation sensor

Alternator

AK300254

82

78

8180

89

90

91

92

79

87

71

74 73 72

76 75

77

85

88

83

84

86

AB

CONNECTOR: C-137

C-137

Harness side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MFI)

13A-122

STEP 6. Replace detonation sensor.

œ

After replacing the detonation sensor, re-check
the trouble symptoms.

Q: Does trouble symptom persist?

YES :

Replace engine-ECU.

NO :

Check end.