Mitsubishi Colt Ralliart. Manual - part 27

 

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Mitsubishi Colt Ralliart. Manual - part 27

 

 

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-62

Code No. P0130: Oxygen Sensor (Front) System

OPERATION

• The sensor signal is inputted to the engine-ECU 

<M/T> or engine-CVT-ECU <CVT> (terminal No. 
34) from the oxygen sensor output terminal (ter-
minal No. 1).

• The oxygen sensor (front) (terminal No. 2) is 

earthed with engine-ECU <M/T> or 
engine-CVT-ECU <CVT> (terminal No. 49).

FUNCTION

• The oxygen sensor converts the concentration of 

oxygen in the exhaust emission into a voltage 
and inputs the signal to the engine-ECU <M/T> or 
engine-CVT-ECU <CVT>.

• When the air-fuel ratio is richer than the theoreti-

cal air-fuel ratio, the oxygen sensor outputs a 
voltage of about 1 V. When it is leaner than the 
theoretical air-fuel ratio, it outputs a voltage of 
about 0 V.

• In response to the signal, the engine-ECU <M/T> 

or engine-CVT-ECU <CVT> controls the fuel 
infection amount so that the air-fuel ratio can be 
equivalent to the theoretical air-fuel ratio.

TROUBLE JUDGMENT

Check Conditions

• Above 5 minutes later after the engine has 

started up.

• The engine coolant temperature is above 82°C 

for 5 seconds or longer <M/T>.

• The engine speed is above 1,200 r/min for 5 sec-

onds or longer <M/T>.

AK503587

1 2

4

3

19

21

20

18

17

16

15

14

1213

11

8 9

L

10

37
52 53 54 555657585960616263646566

38 39 404142434445464748495051

22 23 24 252627282930313233343536

7

5

3

1

6

4

2

Oxygen sensor (front)

Y

GR

From engine control relay

3

2

4

1

49

34

    A-122
MU802083

A-114

Engine-ECU <M/T> or
engine-CVT-ECU <CVT>

To engine-ECU <M/T> or
engine-CVT-ECU <CVT>

AC

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

Oxygen Sensor Circuit (front)

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-63

• The intake manifold pressure is above 20 kPa for 

5 seconds or longer <M/T>.

• Oxygen sensor (front) output voltage is 0.5 V or 

less <CVT>.

• The engine coolant temperature is approximately 

80

°C or higher <CVT>.

• The engine speed is 1,200 r/min or more <CVT>.

• During the run at the constant speed on the flat 

road <CVT>.

Judgment Criteria

• When 5 V is applied to oxygen sensor (front) out-

put line via register, engine-ECU-interface output 
voltage is more than 4.0 V <M/T>.

• When a power voltage of 5 V is applied to the 

oxygen sensor, the sensor output voltage is 4.0 V 
or more <CVT>.

Check Conditions

• Engine speed is more than 1,200 r/min and is 

less than 3,000 r/min <M/T>.

• The engine coolant temperature is above 50°C 

<M/T>.

• The intake manifold pressure is more than 30 

kPa and is less than 60 kPa <M/T>.

• Within the range of air-fuel ratio feedback opera-

tion <M/T>.

Judgment Criterion

• The oxygen sensor (front) sends "lean" and "rich" 

signals alternately 6 times or less for 10 seconds 
<M/T>.

PROBABLE CAUSES

• Failed oxygen sensor

• Open/short circuit in oxygen sensor circuit or 

loose connector contact

• Failed engine-ECU <M/T> or engine-CVT-ECU 

<CVT>

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13A-331

.

a. Item 11: Oxygen sensor (front)

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use 

Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunctions 

P.00-13

).

NO : 

Go to Step 2 .

STEP 2. Connector check: A-122 oxygen sensor 
(front) connector

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace the connector.

STEP 3. Perform resistance measurement at 
A-122 oxygen sensor (front) connector.

• Disconnect connector, and measure at harness 

side.

• Resistance between terminal No. 2 and earth.

OK: Continuity (2 

 or less)

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Go to Step 4 .

AK402012

2 1
4 3

Connector: A-122

A-122 (G)

AC

Oxygen sensor (front)

A-122 Harness side

connector

AK402012

2 1
4 3

Connector: A-122

A-122 (G)

AC

Oxygen sensor (front)

A-122 Harness side

connector

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-64

STEP 4. Connector check: A-114 engine-ECU 
connector or engine-CVT-ECU connector

Q: Is the check result normal?

YES : 

Go to Step 5 .

NO : 

Repair or replace the connector.

STEP 5. Check harness between A-122 (terminal 
No. 2) oxygen sensor connector and A-114 
(terminal No. 49) engine-ECU connector or 
engine-CVT-ECU connector.

• Check earthing line for open circuit and damage.

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Repair the damaged harness wire.

STEP 6. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13A-331

.

a. Item 11: Oxygen sensor (front)

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use Troubleshooting/Inspection 

Service Points 

− How to Cope with 

Intermittent Malfunctions 

P.00-13

).

NO : 

Replace engine-ECU <M/T> or 
engine-CVT-ECU <CVT>.

AK402745

6

4

2

5

3

1

9

7

8

10

11

12

13

14

15

16

17

18

19

20

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59

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62

63

64

65

66

L

AD

A-114

Connector: 

A-114

Harness side connector

Engine-ECU <M/T> or
engine-CVT-ECU <CVT>

Battery

AK402012

2 1
4 3

Connector: A-122

A-122 (G)

AC

Oxygen sensor (front)

A-122 Harness side

connector

AK402745

6

4

2

5

3

1

9

7

8

10

11

12

13

14

15

16

17

18

19

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24

25

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30

31

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33

34

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36

37

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43

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46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

L

AD

A-114

Connector: 

A-114

Harness side connector

Engine-ECU <M/T> or
engine-CVT-ECU <CVT>

Battery

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-65

STEP 7. Perform voltage measurement at A-122 
oxygen sensor connector.

• Use special tool test harness (MD991658) to con-

nect connector, and measure at pick-up harness.

• Engine: After warm-up

• Transmission: P range

• Voltage between terminal No. 2 and earth.

OK: 0.5 V or less

Q: Is the check result normal?

YES : 

Go to Step 9 .

NO : 

Go to Step 8 .

STEP 8. Connector check: A-114 engine-ECU 
connector or engine-CVT-ECU connector

Q: Is the check result normal?

YES : 

Check and repair harness between A-122 

(terminal No. 2) oxygen sensor connector 
and A-114 (terminal No. 49) engine-ECU 
connector or engine-CVT-ECU connector.

• Check output line for damage.

NO : 

Repair or replace the connector.

AK402012

2 1
4 3

Connector: A-122

A-122 (G)

AC

Oxygen sensor (front)

A-122 Harness side

connector

AK402745

6

4

2

5

3

1

9

7

8

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

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29

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32

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35

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47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

L

AD

A-114

Connector: 

A-114

Harness side connector

Engine-ECU <M/T> or
engine-CVT-ECU <CVT>

Battery

AK402012

2 1
4 3

Connector: A-122

A-122 (G)

AC

Oxygen sensor (front)

A-122 Harness side

connector

Main

Index

Group

TOC

 

 

 

 

 

 

 

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