Mitsubishi Eclipse. Manual — part 281

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-617

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.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L>

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STEP 6. Measure the sensor supply voltage at ECM
connector C-60 by backprobing.
(1) Do not disconnect the ECM connector C-60.
(2) Disconnect the vehicle speed sensor connector B-39.
(3) Turn the ignition switch to the "ON" position.

(4) Measure the voltage between terminal No. 86 and ground

by backprobing.

• Voltage should be between 4.8 and 5.2 volts.

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.8 and 5.2 volts?

YES : Go to Step 7.
NO : Replace the ECM. Then go to Step 17.

STEP 7. Check connector C-60 at ECM for damage.
Q: Is the connector in good condition?

YES : Check connector B-36 at intermediate connector for

damage, and repair or replace as required. Refer to
GROUP 00E, Harness Connector Inspection

P.00E-2

. If intermediate connector is in good

condition, repair harness wire between vehicle speed
sensor connector B-39 (terminal No. 3) and ECM
connector C-60 (terminal No. 86) because of open
circuit. Then go to Step 17.

NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 17.

AK300415

82

78

8180

89

90

91

92

79

87

71

74 73 72

76 75

77

85

88

83

84

86

CONNECTOR: C-60 <M/T>

AB

C-60 (G)

HARNESS CONNECTOR:
COMPONENT SIDE

AK000304

7172 73 74 75 76 77 78 79 80 81

82 83 84 85 86 87 88 89 90

92

91

AH

C-60 HARNESS
CONNECTOR:
HARNESS SIDE

AK300415

82

78

8180

89

90

91

92

79

87

71

74 73 72

76 75

77

85

88

83

84

86

CONNECTOR: C-60 <M/T>

AB

C-60 (G)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-619

STEP 8. Check connector B-39 at vehicle speed sensor for
damage.
Q: Is the connector in good condition?

YES : Go to Step 9.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 17.

STEP 9. Measure the power supply voltage at vehicle
speed sensor harness side connector B-39.
(1) Disconnect the connector B-39 and measure at the harness

side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 1 and ground.

• Voltage should be battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)

present?
YES : Go to Step 10.
NO : Check connectors B-36, C-28, C-78, C-112 and C-111

at intermediate connector for damage, and repair or
replace as required. Refer to GROUP 00E, Harness
Connector Inspection

P.00E-2

. If intermediate

connectors are in good condition, repair harness wire
between ignition switch connector C-87 (terminal No.
2) and vehicle speed sensor connector B-39 (terminal
No. 1) because of open circuit or short circuit to
ground. Then go to Step 17.

AK300425

1

2

3

B-39 (B)

AB

CONNECTOR: B-39

HARNESS CONNECTOR:
COMPONENT SIDE

AK300425

1

2

3

B-39 (B)

AB

CONNECTOR: B-39

HARNESS CONNECTOR:
COMPONENT SIDE

AKX01425AL

B-39 HARNESS
CONNECTOR:
COMPONENT SIDE

3 2 1

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-620

STEP 10. Check the continuity at vehicle speed sensor
harness side connector B-39.
(1) Disconnect the connector B-39 and measure at the harness

side.

(2) Check for the continuity between terminal No. 2 and

ground.

• Should be less than 2 ohms.

Q: Is the continuity normal?

YES : Go to Step 11.
NO : Check connector B-36 at intermediate connector for

damage, and repair or replace as required. Refer to
GROUP 00E, Harness Connector Inspection

P.00E-2

. If intermediate connector is in good

condition, repair harness wire between vehicle speed
sensor connector B-39 (terminal No. 2) and ground
because of open circuit or harness damage. Then go
to Step 17.

AK300425

1

2

3

B-39 (B)

AB

CONNECTOR: B-39

HARNESS CONNECTOR:
COMPONENT SIDE

AKX01426

3 2 1

B-39 HARNESS
CONNECTOR:
COMPONENT SIDE

AV