Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 241

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-163

STEP 15. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to,

Procedure 4

−

Heated oxygen Sensor Monitor and

Procedure 6

−

Other Monitor (

P.13B-4

).

(2) Check the diagnostic trouble code (DTC).

Q: Is the DTC P0150 is output?

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-164

DTC P0153: O

2

Sensor Circuit Slow Response (bank 2 sensor 1)

AK000694

4

1 2
3

BLA

CK

BLA

CK

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-165

CIRCUIT OPERATION

•

A voltage corresponding to the oxygen
concentration in the exhaust gas is sent to the
ECM (terminal 71) <M/T> or PCM (terminal 71)
<A/T> from the output terminal (terminal 4) of the
left bank heated oxygen sensor (front).

•

Terminal 2 of the left bank heated oxygen sensor
(front) is grounded with ECM (terminal 49) <M/T>
or PCM (terminal 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
oxygen 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.

DTC SET CONDITIONS

Check Conditions

•

Engine coolant temperature is higher than 50

°

C

(176

°

F).

•

Engine speed is at between 1,250 and 3,000 r/
min.

•

Volumetric efficiency is at between 20 and 60
percent.

•

Intake air temperature is higher than -10

°

C (14

°

F).

•

Barometric pressure is higher than 76 kPa (11
psi).

•

Under the closed loop air/fuel control.

•

ECM <M/T> or PCM <A/T> dose not judge to be
idling state.

Judgment Criteria

•

The left bank heated oxygen sensor (front) sends
"lean" and "rich" signals alternately 10 times
(Response time 1.2 or equivalent) or less for 12
seconds.

•

Only one monitor during one drive cycle

NOTE: If the sensor switch time is longer than the
Judgment Criteria due to the MUT-II 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
broken 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.

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

•

Left bank heated oxygen sensor (front)
deteriorated.

•

Open circuit in left bank heated oxygen sensor
(front) output line.

•

Open circuit in left bank heated oxygen sensor
(front) ground line.

•

ECM failed. <M/T>

•

PCM failed. <A/T>

DIAGNOSIS

Required Special Tools
MB991502: Scan Tool (MUT-II)

ACX02489AC

CONNECTOR : B-24

LEFT BANK
HEATED OXYGEN
SENSOR
(FRONT)

AK000225

CONNECTORS : C-58, C-62<M/T>,
C-55, C-59<A/T>

C-55

C-58

PCM<A/T>

ECM<M/T>

AK

C-59

C-62

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-166

STEP 1. Using scan tool MB991502, check data list item 11:
Heated Oxygen Sensor Bank 2, Sensor 1 (left front).

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991502 to the data reading mode for item

11, Heated Oxygen Sensor Bank 2, Sensor 1 (left front).

(4) Warm up the engine, 2500r/min.

•

Output voltage repeats 0.4 volt or less and 0.6

−

1.0 volt

10 times or more within 10 seconds.

(5) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the sensor operating properly?

YES : It can be assumed that this malfunction is intermittent.

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

P.00-6

).

NO : Replace the left bank heated oxygen sensor (front).

Then go to Step 2.

STEP 2. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to,

Procedure 6

−

Other Monitor (

P.13B-4

).

(2) Check the diagnostic trouble code (DTC).

Q: Is the DTC P0153 is output?

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

DTC P0154: O

2

Sensor Circuit No Activity Detected (bank 2 sensor 1)

O

2

SENSOR CIRCUIT NO ACTIVITY DETECTED

(BANK 2 SENSOR 1) CIRCUIT

•

Refer to, DTC P0150

−

Left Bank Heated Oxygen

Sensor (front) Circuit (

P.13B-154

).

•

Refer to, DTC P0202, P0204, P0206

−

Injector

Circuit (

P.13B-227

).

CIRCUIT OPERATION

•

Refer to, DTC P0150

−

Left Bank Heated Oxygen

Sensor (front) Circuit (

P.13B-154

).

•

Refer to, DTC P0202, P0204, P0206

−

Injector

Circuit (

P.13B-227

).

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
oxygen 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.

DTC SET CONDITIONS

Check Area

•

Thirty seconds or more have passed since the
starting sequence was completed.

•

Engine coolant temperature is higher than 81

°

C

(178

°

F).

•

Engine speed is higher than 1200 r/min.

•

Volumetric efficiency is higher than 30 percent.

AKX01177

16 PIN

MB991502

AB