Mitsubishi Lancer Evolution IX. Manual - part 428

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-187

Code No. P0500: Vehicle Speed Sensor System

AK501816

1 2 3
4 5 6

2 3

1

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

B-W

B-W*1
O*2

B-W

B-W

B-Y

B

B

B

B-R

B-Y

5V

B-04

(MU802723)

Vehicle speed sensor

80

R

IG2

ST

LOCK

ACC

IG1

C-211

C-124
18 (*1)
or
16 (*2)

B-27

B-27

B-27

C-214

Ignition
switch

C-208

2

6

25

1

6

7

5

3

8

Meter and gauge

Vehicle speed sensor circuit

C-117

(MU803783)

2

7.5A

Engine-ECU

Wire colour code
B: Black  LG: Light green  G: Green  L: Blue  W: White  Y: Yellow  SB: Sky blue  BR: Brown  O: Orange  GR: Gray
R: Red  P: Pink  V: Violet  PU: Purple

J/B

AB

NOTE

*1: L.H. drive vehicles
*2: R.H. drive vehicles

C-124
17 (*1)
or
25 (*2)

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-188

OPERATION

• A power voltage of 5 V is applied to the vehicle 

speed sensor (terminal No. 3) from the 
engine-ECU (terminal No. 80).

FUNCTION

• The vehicle speed sensor converts the vehicle 

speed to the voltage, and then input it into the 
engine-ECU.

TROUBLE JUDGMENT

Check Conditions

• 2 seconds later after the engine has started up.

• The engine speed is 2,000 − 4,000 r/min.

• The volumetric efficiency is 60 − 80%.

Judgment Criterion

• The sensor output voltage remains unchanged 

(no pulse signal is inputted) for 2 seconds.

PROBABLE CAUSES

• Failed Vehicle speed sensor

• Open/short circuit in vehicle speed sensor circuit 

or loose connector contact

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check the speedometer

Q: Is the check result normal?

YES : 

Go to Step 2 .

NO : 

Check the speedometer (Refer to GROUP 
54A 

−Combination Meter Assembly − 

On-vehicle Service 

P.54A-53

).

STEP 2. M.U.T.-II/III data list

• Refer to Data List Reference Table 

P.13A-372

.

a. Item No. 24: Vehicle speed sensor

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Intermittent malfunction (Refer to GROUP 
00 - How to Use Troubleshooting/Inspection 
Service Points 

P.00-5

).

STEP 3. Connector check: C-117 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 4 .

NO : 

Repair or replace the connector.

AK501996

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

AB

Connector: C-117

C-117 (GR)

C-117 (GR)

Harness side connector

<L. H. drive vehicles>

<R. H. drive vehicles>

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-189

STEP 4. Check harness between C-117 (terminal 
No. 80) engine-ECU connector and B-04 (terminal 
No. 3) vehicle speed sensor connector.

NOTE: Before checking harness, check intermediate 
connectors B-27 and C-124, and repair if necessary.

• Check output line for open circuit and damage.

Q: Is the check result normal?

YES : 

Go to Step 5 .

NO : 

Repair the damaged harness wire.

STEP 5. Check the trouble symptoms.

Q: Does trouble symptom persist?

YES : 

Replace the engine-ECU.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use 

Troubleshooting/Inspection Service Points 

P.00-5

).

AK501996

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

AB

Connector: C-117

C-117 (GR)

C-117 (GR)

Harness side connector

<L. H. drive vehicles>

<R. H. drive vehicles>

AK305027

1

2

3

AB

Transmission assembly

Connector : B-04

Harness side 
connector

B-04(B)

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-190

Code No P0505: Idle Speed Control Servo System

1 2
4 5 6

3

AK501817

1

2

3

4

2

3 4

5 6

7 8

9

11 12 13 14 15 16 17 18 19 20

30

21 22 23

24 25

26 27 28 29

3132 33

34 35

1

10

B-104

Idle speed control
servo

1

4

2

3

3

1

2

4

5

6

14

28

15

29

Idle speed control servo circuit

B-12X

C-121

(MU803784)

B-Y

R-Y

R-Y

Y-L

Y

R-G

LG

R-Y

B-Y

B-Y

Battery

6 <A-13> (*1) or
13 <C-31> (*2)

Engine control relay

Engine-ECU

Wire colour code
B: Black  LG: Light green  G: Green  L: Blue  W: White  Y: Yellow  SB: Sky blue  BR: Brown  O: Orange  GR: Gray
R: Red  P: Pink  V: Violet  PU: Purple

NOTE

*1: L.H. drive vehicles
*2: R.H. drive vehicles

AB

To engine-ECU