Mitsubishi Eclipse. Manual — part 171

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-177

STEP 12. Check the maladjusted throttle position sensor.
Refer to, Throttle Position Sensor Adjustment

P.13A-927

.

Q: Is the output voltage normal?

YES : Go to Step 13.
NO : Adjust it. Then go to Step 14.

STEP 13. 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 14.

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.13A-5

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0121 set?

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

AK300810

AB

MB991911

16-PIN

MB991827

MB991824

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-178

DTC P0122: Throttle Position Sensor Circuit Low Input

AK000656

2 3 4

1

98

78

71

88 89

76 77

72
79
91

73
80

74

75

81
92

8283
93

8485

94

8687

9596

90

97

GREEN-

YELL

OW

YELL

OW

YELL

O

W

BL

ACK

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

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

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

81 <M/T>
46 <A/T>*1

5V

C-60 <M/T>
(MU803772)

C-54 <A/T>
(MU803781)

C-57 <A/T>
(MU803782)

AUTO-CRUISE
CONTROL SYSTEM

B-07
(MU802724)

THROTTLE POSITION
SENSOR

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

4

3

1

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

Throttle Position Sensor (TPS) Circuit

AK300050

CONNECTOR: B-07

THROTTLE
POSITION
SENSOR

AB

B-07 (B)

AK300060

ECM

CONNECTOR: C-60 <M/T>

AE

C-60 (G)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-179

.

CIRCUIT OPERATION

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

position sensor power terminal (terminal No. 4)
from the ECM (terminal No. 81) <M/T> or PCM
(terminal No. 46) <A/T>.
The ground terminal (terminal No. 1) is grounded
with ECM (terminal No. 92) <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 throttle position sensor out-
put terminal (terminal No. 3) and ground terminal
will increase according to the rotation.

.

TECHNICAL DESCRIPTION

• The throttle position sensor 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 output voltage is out of speci-

fied 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

.

AK300060

PCM

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

AI

C-57 (GR)

C-54 (GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-180

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• 2 seconds or more have passed since the start-

ing sequence was completed.

Judgement Criteria

• Throttle position sensor output voltage has con-

tinued to be 0.2 volt or lower for 2 seconds.

.

OBD-ll DRIVE CYCLE PATTERN
None.

.

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

• Throttle position sensor failed.

• Open or shorted throttle position sensor circuit, or

connector damage.

• ECM failed. <M/T>

• PCM failed. <A/T>

DIAGNOSIS

Required Special Tools:

• MB991958 (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

START

END

NO

NO

YES

YES

MALFUNCTION

GOOD

CONTINUOUS

FAILURE FOR 2 secs

OUTPUT VOLTAGE

< 0.2V

NO

YES

MONITORING

CONDITIONS

AK301429