Mitsubishi Eclipse. Manual - part 411

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-187

STEP 8. Check for open circuit and short circuit to ground 
between throttle position sensor connector B-07 (terminal 
No. 3) and ECM connector C-62 (terminal No. 78) <M/T> or 
PCM connector C-59 (terminal No. 78) <A/T>.
Q: Is the harness wire in good condition?

YES : Go to Step 9.
NO :  Repair it. Then go to Step 11.

AK300434

2 1

3

4

CONNECTOR: B-07

AB

B-07 (B)

HARNESS CONNECTOR:
COMPONENT SIDE

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-188

STEP 9. Check for short circuit to ground between throttle 
position sensor connector and auto-cruise control-ECU.
Refer to GROUP 17, Auto Cruise Control System 

− Diagnostic 

Trouble Code Chart 

P.17-12

.

Q: Is the harness wire in good condition?

YES : Go to Step 10.
NO :  Repair it. Then go to Step 11.

STEP 10. Using scan tool MB991958, check data list item 
14: Throttle Position Sensor.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to the data reading mode for item 

14, Throttle Position Sensor.

• With the throttle valve in the idle position, voltage should 

be between 0.535 and 0.735 volt.

• With the throttle valve in the full-open position, voltage 

should be between 4.5 and 5.5 volts.

(4) 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 GROUP 00, How to Use Troubleshooting/ 
Inspection Service Points 

P.00-6

.

NO :  Replace the ECM or PCM. Then go to Step 11.

STEP 11. 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 P0122 set?

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

AK300810

AB

MB991911

16-PIN

MB991827

MB991824 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-189

DTC P0123: Throttle Position Sensor Circuit High Input

AK000689

2 3 4

1

GREEN-

YELL

O

W

YELL

O

W

Y

ELL

OW

BL

ACK

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

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

78
<M/T>*2
78
<A/T>*4

42
<M/T>*1
46
<A/T>*3

5V

AUTO-CRUISE
CONTROL SYSTEM

      B-07
(MU802724)

THROTTLE POSITION
SENSOR

4

3

1

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

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

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>

Throttle Position Sensor (TPS) Circuit

AK300080

CONNECTOR: B-07

THROTTLE
POSITION
SENSOR

AB

B-07 (B)

AK300244

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

AD

PCM

C-55 (GR)

C-59 (GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-190

.

CIRCUIT OPERATION

• A 5-volt power supply is applied on the TPS 

power terminal (terminal No. 4) from the ECM 
(terminal No. 42) <M/T> or PCM (terminal No. 46) 
<A/T>.
The ground terminal (terminal No. 1) is grounded 
with ECM (terminal No. 49) <M/T> or PCM (termi-
nal No. 57) <A/T>.

• When the throttle valve shaft is turned from the 

idle position to the fully opened position, the 
resistor between the TPS output terminal (termi-
nal No. 3) and ground terminal will increase 
according to the rotation. 

.

TECHNICAL DESCRIPTION

• The TPS outputs voltage which corresponds to 

the throttle valve opening angle.

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

the voltage is within a specified range. In addi-
tion, it checks that the voltage output does not 
become too high while the engine is at idle.

.

DESCRIPTIONS OF MONITOR METHODS
Throttle position sensor (main) output voltage is out 

of specified range.

.

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)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Not applicable

.

AK300091

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

ECM

AD

C-58 (GR)

C-62 (GR)