Mitsubishi Eclipse. Manual - part 558

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-775

DESCRIPTIONS OF MONITOR METHODS

• If the vehicle speed sensor output does not 

change while the vehicle is being driven in the 
medium- to high-speed range, a malfunction is 
determined to have occurred.

.

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)

• Volume airflow sensor

.

DTC SET CONDITIONS (Entry Conditions and Malfunction Thresholds)

Logic Flow Chart

.

Check Conditions

• 2 seconds or more have passed the starting 

sequence was completed.

• Engine speed is at between 2,100 and 4,000 

r/min.

• Volumetric efficiency is at between 40 and 70 

percent.

Judgement Criteria

• Vehicle speed sensor output voltage has not 

changed (no pulse signal is input) for 2 seconds.

.

OBD-II DRIVE CYCLE PATTERN
None

.

START

MONITORING
CONDITIONS

END

No

NO

NO

YES

YES

YES

MALFUNCTION

GOOD

OUTPUT FREQUENCY

=/  0Hz

CONTINUOUS

FAILURE

secs

A302603

2

FOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-776

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

• Vehicle speed sensor failed.

• Open or shorted vehicle speed sensor circuit, or 

harness damage, or connector damage.

• ECM failed.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

STEP 1. Using scan tool MB991958, check data list item 24: 
Vehicle Speed 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) Start the engine.
(3) Set scan tool MB991958 to the data reading mode for item 

24, Vehicle Speed Sensor.

• Check that the speedometer and MUT-III display speed 

match when traveling at a vehicle speed of 40 km/h (25 
mph).

(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/I 
nspection Service Points 

P.00-6

.

NO :  Go to Step 2.

STEP 2. Check speed meter.
Q: Is the speed meter functioning?

YES : Go to Step 3.
NO :  Go to Step 8.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-777

STEP 3. Using the oscilloscope, check the sensor output 
voltage at ECM connector C-62.
(1) Do not disconnect the ECM connector C-62.
(2) Disconnect the combination meter connector and 

auto-cruise control-ECU connector.

(3) Connect the oscilloscope probe to terminal No. 80 of the 

ECM by backprobing.

(4) Start the engine.

(5) Check the waveform.

• The waveform should show a pattern similar to the illus-

tration while the vehicle is being moved.

(6) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the waveform normal?

YES : Go to Step 4.
NO :  Go to Step 6.

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

AK000257

71 72

73 74

78

80 81

79

82 83 84 85 86 87 88 89

75 76

91 92 93

94 95

96

98

99

97

AK000257AB

ECM CONNECTOR

77

90

100

OSCILLOSCOPE

AKX01562

AKX01562

(ms)

0

(V)

NORMAL WAVEFORM

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-778

STEP 4. Check connector C-62 at ECM for damage.
Q: Is the connector in good condition?

YES : Go to Step 5.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 17.

STEP 5. Using scan tool MB991958, check data list item 24: 
Vehicle Speed 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) Start the engine.
(3) Set scan tool MB991958 to the data reading mode for item 

24, Vehicle Speed Sensor.

• Check that the speedometer and MB991958 display 

speed match when traveling at a vehicle speed of 40 
km/h (25 mph).

(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. Then go to Step 17.

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

AK300810

AB

MB991911

16-PIN

MB991827

MB991824