Mitsubishi Eclipse. Manual - part 417

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-211

STEP 13. Check for harness damage between engine 
coolant temperature sensor connector B-11 (terminal No. 
1) and ECM connector C-58 (terminal No. 44) <M/T> or PCM 
connector C-55 (terminal No. 44) <A/T>.
Q: Is the harness wire in good condition?

YES : Replace the ECM or PCM. Then go to Step 14.
NO :  Repair it. Then go to Step 14.

AK300435

1

2

CONNECTOR: B-11

AB

B-11 (B)

HARNESS CONNECTOR:
COMPONENT SIDE

AK300462

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

CONNECTOR: C-55 <A/T>

C-55 (GR)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AK300748

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

CONNECTOR: C-58 <M/T>

AB

C-58 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-212

STEP 14. 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 P0125 set?

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

DTC P0128 : Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

.

TECHNICAL DESCRIPTION

• The ECM <M/T> or PCM <A/T> checks the time 

for the engine coolant temperature to reach the 
judgment temperature.

.

DESCRIPTIONS OF MONITOR METHODS
Engine coolant temperature does not reach 77

°C 

(171

°F) within specified period after cold start.

.

MONITOR EXECUTION
Once per driving cycle

.

MONITOR EXECUTION CONDITIONS (Other 
monitor and Sensor)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Volume airflow sensor

• Engine coolant temperature sensor

• Intake air temperature sensor

.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-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 

− 100Hz or less) state for 5 

minutes or less.

Judgment Criteria

• The time for the engine coolant temperature to 

rise to 77

°C (171°F) takes longer than approxi-

mately 14 to 21 minutes.

• The ECM <M/T> or PCM <A/T> 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) <3.0L>

13B-214

DIAGNOSIS

STEP 1. Check the cooling system.
Refer to 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 (bank 1, sensor 1)

AK101597

4

1 2

3

BL

UE

BL

ACK

BL

ACK

GREEN

     B-27
MU802605

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

RIGHT BANK HEATED OXYGEN
SENSOR (FRONT)

FROM MFI RELAY

TO ECM
OR PCM

1

2

3

4

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

72<M/T>*2
72<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

Right Bank Heated Oxygen Sensor (front) Circuit

S142