Mitsubishi Montero Sport (2004+). Manual - part 212

 

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Mitsubishi Montero Sport (2004+). Manual - part 212

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-261

Check Conditions

• Engine coolant temperature is higher than 76°C 

(169

°F).

• The right bank heated oxygen sensor (front) is 

active.

• The cumulative volume airflow sensor output fre-

quency is higher than 4,000 Hz.

• Repeat 3 or more times: drive

*1

, stop

*2

.

Drive

*1

:

• Engine speed is higher than 1,500 r/min.

• Volumetric efficiency is higher than 40 per-

cent.

• Vehicle speed is higher than 30 km/h (18.7 

mph).

• A total of more than 10 seconds have 

elapsed with the above mentioned condi-
tions, and more than 2 seconds have 
elapsed with the fuel shut off.

Stop

*2

• Vehicle speed is lower than 1.5 km/h 

(0.9mph).

Judgement Criteria

• Change in the output voltage of the right bank 

heated oxygen sensor (rear) is lower than 0.313 
volt.
NOTE: Monitoring stops after fuel has been shut 
off for more than 38 seconds.

.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Procedure 4 

− Heated Oxygen Sensor Monitor 

P.13A-4

.

.

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

• Right bank heated oxygen sensor (rear) failed.

• Connector damage.

• PCM failed.

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I

• MB991827: USB Cable

• MB991911: Main Harness B

• MB991316: Test Harness

STEP 1. Using scan tool MB991958, check data list item 69: 
Heated Oxygen Sensor Bank 1, Sensor 2 (right rear).

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 and run at idle.
(3) Set scan tool MB991958 to the data reading mode for item 

69, Heated Oxygen Sensor Bank 1, Sensor 2 (right rear).

(4) Warm up the engine.

• After increasing the output voltage 0.15 volt or more by 

the engine revving, finish it. Then confirm that the output 
voltage reduces to 0.15 volt or less within 3 seconds.

(5) 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.00-7

.

NO :  Replace the heated oxygen sensor (rear). Then go to 

Step 2. 

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-262

STEP 2. Check the right bank heated oxygen sensor (rear).
(1) Disconnect the right bank heated oxygen sensor (rear) 

connector E-47 and connect test harness special tool, 
MB991316, to the connector on the right bank heated 
oxygen sensor (front) side.

(2) Warm up the engine until engine coolant 80

°C (176°F) or 

higher.

(3) Perform a tracing for 5 minutes or more with the engine 

speed of 4,500 r/min.

(4) Connect a digital volt meter between terminal No. 2 (black 

clip) and terminal No. 4 (white clip).

(5) While repeatedly revving the engine, measure the right 

bank heated oxygen sensor (rear) output voltage.

Standard value: 0.6 

 1.0 volt

CAUTION

• Be very careful when connecting the jumper wire; 

incorrect connection can damage the oxygen sensor.

• Be careful the heater is broken when voltage of beyond 

12 volts is applied to the oxygen sensor heater.
NOTE: If the sufficiently high temperature (of approximate 
400

°

C or more) is not reached although the oxygen sensor 

is normal, the output voltage would be possibly low 
although the rich air-fuel ratio. Therefore, if the output volt-
age is low, use a jumper wire to connect the terminal No.2 
and the terminal No. 1 of the oxygen sensor with a (+) termi-
nal and (-) terminal of 12 volts power supply respectively, 
then check again.

Q: Is the voltage between 0.6 and 1.0 volt?

YES : Go to Step 3.
NO :  Replace the right bank heated oxygen sensor (rear). 

Then go to Step 4.

AK200492

1

2

3

4

E-47(GR)

AB

CONNECTOR: E-47

HARNESS 
CONNECTOR: 
COMPONENT SIDE

RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)

AKX01624

HEATED
OXYGEN
SENSOR
COMPONENT
SIDE
CONNECTOR

MB991316

WHITE

BLACK

AN

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-263

STEP 3. Check harness connector E-47 at right bank 
heated oxygen sensor (rear) and harness connector C-90, 
C-91 at PCM for damage.
Q: Is the harness connector in good condition?

YES : Replace the PCM.Then go to Step 4.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 4.

STEP 4. 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 4 − 

Heated Oxygen Sensor Monitor 

P.13A-4

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0139 set?

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

AK200492

1

2

3

4

E-47(GR)

AB

CONNECTOR: E-47

HARNESS 
CONNECTOR: 
COMPONENT SIDE

RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)

AK104029

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

98

78

71

88

89

76

77

72
79
91

73
80

74

75

81
92

82

83

93

84

85

94

86

87

95

96

90

97

AB

CONNECTORS: C-90, C-91

C-90(GR) C-91(GR)

C-90 HARNESS CONNECTOR:
COMPONENT SIDE

C-91 HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-264

DTC P0141: Heated Oxygen Sensor Heater Circuit (bank 1 sensor 2)

AK200184

Right Bank Heated Oxygen Sensor (rear) Heater Circuit

RED

RED

WHITE-

BLA

CK

WHITE-

BLA

CK

WHITE-

BLA

CK

POWERTRAIN CONTROL MODULE (PCM)

1

2

22

33

1

3

2

4

3

4

12

28

27

MFI
RELAY

RIGHT BANK HEATED OXYGEN
SENSOR (REAR)

FUSIBLE LINK (12)

TO PCM TO PCM

C-59

1

10

2 3 4 5 6 7 8 9

11

12 13 14 15 16 17 18 19 20 21 22

23 24 25 26 27 28 29 30 31 32 33

C-14

10

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

31 32 33

34 35

1

C-89
(MU803784)

BLUE-

YELLO

W

RED

RED

BLUE-

YELLO

W

BLUE-

YELLO

W

10

1

11

12

1 2
3 4

E-47
MU802665

1

10

15

2

11

3

12

4

13 14

5

16

6

17

7

18

8

19

9

20

E-45

RED

6

10

2

7

8

3 4 5

9

11 12 13

1

C-79
MU801553

JOINT
CONNECTOR (5)

1

2

3

4

AK103911AB

CONNECTOR: C-14

C-14

AK103911AC

CONNECTOR: C-79

C-79

 

 

 

 

 

 

 

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