Mitsubishi Eclipse. Manual - part 455

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-363

STEP 3. 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.13B-7

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0152 set?

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

AK300460

98

78

71

88

89

76

77

72
79
91

73
80

74

75

81
92

82

83

93

84

85

94

86

87

95

96

90

97

CONNECTOR: C-59 <A/T>

C-59 (GR)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AK300445

80

87

81

94

85

82

84

93

86

98

99

74

92

73

83

88

91

95

97 96

100

89

78

71

90

76

77

75

72
79

CONNECTOR: C-62 <M/T>

C-62 (GR)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-364

DTC P0153: Heated Oxygen Sensor Circuit Slow Responce (bank 2, sensor 1)

AK000694

4

1 2
3

BL

ACK

BL

ACK

WHITE

     B-24
MU802605

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

LEFT BANK HEATED OXYGEN
SENSOR (FRONT)

FROM MFI RELAY

TO ECM
OR PCM

1

2

3

4

49 <M/T>*1
57 <A/T>*3

71 <M/T>*2
71 <A/T>*4

NOTE
*1:ECM connector C-58 <M/T>
*2:ECM connector C-62 <M/T>
*3:PCM connector C-55 <A/T>
*4:PCM connector C-59 <A/T>

98

78

71

88 89

76 77

72
79
91

73
80

74

75

81
92

82 83
93

84 85

94

86 87

95 96

90

80

87

81

94

85

82

84

93

86

98

99

74

92

73

83

88

91

95

97

96

100

89

78

71

90

76 77

75

72
79

97

C-62 <M/T>
(MU803783)

C-59 <A/T>
(MU803782)

65

43
50

42
49

41
48
60 61

64

46 47
58 59
67 68

45

56
66

52

51

44

53

62

54

63

57

55

C-58 <M/T>
(MU803782)

C-55 <A/T>
(MU803781)

42 43
48 49 50 51 52 53 54 55 56 57

46

45

44

58 59

60 61 62 63

64 65 66

47

41

Left Bank Heated Oxygen Sensor (front) Circuit

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-365

.

CIRCUIT OPERATION

• A voltage corresponding to the oxygen concen-

tration in the exhaust gas is sent to the ECM (ter-
minal No. 71) <M/T> or PCM (terminal No. 71) 
<A/T> from the output terminal (terminal No. 4) of 
the left bank heated oxygen sensor (front).

• Terminal No. 2 of the left bank heated oxygen 

sensor (front) is grounded with ECM (terminal 
No. 49) <M/T> or PCM (terminal No. 57) <A/T>.

.

TECHNICAL DESCRIPTION

• The left bank heated oxygen sensor (front) 

detects the concentration of oxygen in the 
exhaust gas; it converts that data to voltage, and 
sends it to the ECM <M/T> or PCM <A/T>.

• When the left bank heated oxygen sensor (front) 

begins to deteriorate, the heated oxygen sensor 
signal response deteriorates also.

• The ECM <M/T> or PCM <A/T> varies the air/fuel 

mixture to make it leaner and richer, and checks 
the response speed of the left bank heated oxy-
gen sensor (front). In addition, the ECM <M/T> or 
PCM <A/T> also checks for an open circuit in the 
left bank heated oxygen sensor (front) output 
line.

.

DESCRIPTIONS OF MONITOR METHODS
Left bank heated oxygen sensor (front) rich/lean 

switching frequency is under specified value.

.

MONITOR EXECUTION
Continuous

.

MONITOR EXECUTION CONDITIONS (Other 
monitor and Sensor)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• Heated oxygen sensor heater (front) monitor

• Misfire monitor

• Fuel system monitor

Sensor (The sensor below is determined to be 

normal)

• Volume airflow sensor

• Engine coolant temperature sensor

• Intake air temperature sensor

• Barometric pressure sensor

• Throttle position sensor

.

AK300061

LEFT BANK 
HEATED OXYGEN
SENSOR (FRONT)

CONNECTOR: B-24

AB

B-24 (B)

AK300244

CONNECTORS: C-52, C-59 <A/T>

AF

PCM

C-52 (GR)

C-59 (GR)

AK300091

CONNECTORS: C-58, C-62 <M/T>

ECM

AD

C-58 (GR)

C-62 (GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-366

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Engine coolant temperature is higher than 50°C 

(122

°F).

• Engine speed is at between 1,250 and 3,000 

r/min.

• Volumetric efficiency is between 20 and 60 per-

cent at AT.

• Volumetric efficiency is between 18 and 60 per-

cent at MT.

• Under the closed loop air/fuel control.

• The throttle valve is open.

• Short-term fuel trim is higher than −30 and lower 

than +25 percent.

• More than 3 seconds have elapsed after the 

abovementioned conditions have been met.

• The ECM <M/T> or PCM <A/T> monitors for this 

condition for 7 cycles of 12 second each during 
the drive cycle.

Judgment Criteria

• The left bank heated oxygen sensor (front) sends 

"lean" and "rich" signals alternately 11 times or 
less for 12 seconds.
NOTE: If the sensor switch time is longer than the 
Judgment Criteria due to the MUT-III OBD-II test 
Mode 

−

 H02S Test Results, it is assumed that the 

heated oxygen sensor has deteriorated. If it is 
short, it is assumed that the harness wire is bro-
ken or has a short circuit.
If the heated oxygen sensor signal voltage has 
not changed even once (lean/rich) after the DTC 
was erased, the sensor switch time will display as 
0 seconds.

.

OBD-ll DRIVE CYCLE PATTERN
Refer to , Diagnostic Function 

− OBD-ll Drive Cycle − 

Procedure 4 

− Heated Oxygen Sensor Monitor 

P.13B-7

.

.

F1: THRESHOLD VALUE FOR REAL-TIME SWITDHING FREQUENCY
F0: THRESHOLD VALUE FOR AVERAGE SWITDHING FREQUENCY

START

MONITORING

CONDITIONS

MALFUNCTION

GOOD

END

NO

NO

YES

YES

Ff < F0

CALCULATE AVERAGE SWITCHING

FREQUENCY (Ff) OVER SPECIFIED TIMES

AK301438