Mitsubishi Eclipse. Manual - part 180

 

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Mitsubishi Eclipse. Manual - part 180

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-213

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Engine coolant temperature is between −10°C 

(14

°F) and 77°C (171°F) when the engine is 

started.

• The engine coolant temperature − intake air tem-

perature is 5

°C (9°F) or less when the engine is 

started.

• The intake air temperature when the engine is 

started 

− intake air temperature is 5°C (9°F) or 

less.

• The volume airflow sensors output frequency is in 

the low frequency (50 

− 100 Hz or less) state for 

300 seconds or less.

Judgment Criteria

• The time for the engine coolant temperature to 

rise to 77

°C (171°F) takes longer than approxi-

mately 11 to 22 minutes.

• The PCM monitors for this condition once during 

the drive cycle.

.

OBD-ll DRIVE CYCLE PATTERN
None.

.

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

• The thermostat is faulty

• ECM <M/T> failed.

• PCM <A/T> failed.

START

END

YES

NO

NO

YES

MALFUNCTION

GOOD

TIME HAVE PASSED

AFTER STARTING?*

ENGINE COOLANT TEMP.

>=77˚C (171˚F)

*: See DTC SET CONDITIONS-JUDGMENT CRITERIA

MONITORING

CONDITIONS?

NO

YES

AK204044

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-214

DIAGNOSIS

STEP 1. Check the cooling system.
Refer to GROUP 14, Engine Cooling Diagnosis 

P.14-3

.

Q: Is the cooling system normal?

YES : Replace the ECM <M/T> or PCM<A/T>. Then check 

that the DTC P0128 does not reset.

NO :  Repair it. Then check that the DTC P0128 does not 

reset.

DTC P0130: Heated Oxygen Sensor Circuit (sensor 1)

AK000657

4

1 2
3

BL

ACK

BL

ACK

WHITE

     B-17
MU802605

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

HEATED OXYGEN
SENSOR (FRONT)

FROM MFI RELAY

TO ECM
OR PCM

1

2

3

4

92 <M/T>
57 <A/T>*1

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

C-60 <M/T>
(MU803772)

C-54 <A/T>
(MU803781)

C-57 <A/T>
(MU803782)

NOTE
*1:PCM connector C-54 <A/T>
*2:PCM connector C-57 <A/T>

98

78

71

88 89

76 77

72
79
91

73
80

74

75

81
92

8283
93

8485

94

8687

9596

90

97

82

78

81

80

89 90 91 92

79

87

71

74

73

72

76

75

77

85

88

83 84

86

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

Heated Oxygen Sensor (front) Circuit

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-215

.

CIRCUIT OPERATION

• A voltage corresponding to the oxygen concen-

tration in the exhaust gas is sent to the ECM (ter-
minal No. 76) <M/T> or PCM (terminal No. 71) 
<A/T> from the output terminal (terminal No. 4) of 
the heated oxygen sensor (front).

• Terminal No. 2 of the heated oxygen sensor 

(front) is grounded with ECM (terminal No. 92) 
<M/T> or PCM (terminal No. 57) <A/T>.

.

TECHNICAL DESCRIPTION

• The heated oxygen sensor (front) detects the 

concentration of oxygen in the exhaust gas; it 
converts those data to voltage, and inputs the 
resulting signals to the ECM <M/T> or PCM 
<A/T>.

• When the heated oxygen sensor (front) begins to 

deteriorate, the heated oxygen sensor signal 
response becomes poor.

• The ECM <M/T> or PCM <A/T> forcibly varies 

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

.

DESCRIPTIONS OF MONITOR METHODS
Heated oxygen sensor (front) circuit is switched to 5 

volts intentionally when oxygen sensor output is 
low, and detects the malfunction if the output volt-
age changes to equal or greater than 4.5 volts. 
The above procedure is repeated when oxygen 
sensor is inactive.

.

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

.

AK300051AB

B-17 (B)

HEATED OXYGEN
SENSOR (FRONT)

CONNECTOR: B-17

AK300060

ECM

CONNECTOR: C-60 <M/T>

AE

C-60 (G)

AK300060

PCM

CONNECTORS: C-54, C-57 <A/T>

AI

C-57 (GR)

C-54 (GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-216

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• 3 minutes or more have passed since the starting 

sequence was completed.

• Heated oxygen sensor (front) signal voltage has 

continued to be 0.2 volt or lower.

• Engine coolant temperature is higher than 76°C 

(169

°F).

• Engine speed is higher than 1,200 r/min.

• Volumetric efficiency is higher than 25 percent.

• Monitoring time: 7 seconds.

START

V

F

 > =4.5V

2secs HAS PASSED

YES

YES

YES

NO

NO

NO

MALFUNCTION

MONITORING

CONDITIONS

YES

NO

MONITORING

CONDITIONS

+5V ON

AK301436

V

F

 < 0.2V

10secs HAS PASSED

YES

YES

NO

NO

END

MALFUNCTION

GOOD

MODULATE A/F CONDITION TO RICH

 

 

 

 

 

 

 

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