Mitsubishi Galant. Manual — part 106

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-105

DTC P0130: O

2

Sensor Circuit Malfunction (sensor 1)

CIRCUIT OPERATION

•

A voltage corresponding to the oxygen
concentration in the exhaust gas is sent to the
PCM (terminal 71) from the output terminal
(terminal 4) of the heated oxygen sensor (front).

•

Terminal 2 of the heated oxygen sensor (front) is
grounded with PCM (terminal 57).

TECHNICAL DESCRIPTION

•

The heated oxygen sensor (front) detects the
concentration of oxygen in the exhaust gas; it
converts those data to voltage, and inputs the
resulting signals to the PCM.

AK000464

4

1 2
3

BLA

CK

BLA

CK

WHITE

B-15
MU802605

POWERTRAIN CONTROL
MODULE(PCM)

HEATED OXYGEN
SENSOR(FRONT)

FROM MFI RELAY

TO ECM
OR PCM

1

2

3

4

57

71

C-40
(MU803781)

C-41
(MU803782)

98

78

71

88 89

76 77

72
79
91

73
80

74

75

81
92

8283
93

8485

94

8687

9596

90

97

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

ACX02476

CONNECTOR : B-15

AF

HEATED OXYGEN
SENSOR (FRONT)

AK000280

CONNECTORS : C-40, C-41

C-41

C-40

PCM

AX

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-106

•

When the heated oxygen sensor (front) begins to
deteriorate, the heated oxygen sensor signal
response becomes poor.

•

The PCM forcibly varies the air/fuel mixture to
make it leaner and richer, and checks the
response speed of the heated oxygen sensor
(front). In addition, the PCM also checks for an
open circuit in the heated oxygen sensor (front)
output line.

DTC SET CONDITIONS

Check Conditions

•

Heated oxygen sensor (front) signal voltage has
continued to be 0.2 volt or lower for three minutes
or more after the starting sequence was
completed.

•

Engine coolant temperature is higher than 82

°

C

(180

°

F).

•

Engine speed is higher than 1,200 r/min.

•

Volumetric efficiency is higher than 25 percent.

•

Monitoring time: 7 seconds.

Judgment Criteria

•

Input voltage supplied to the PCM interface
circuit is higher than 4.5 volts when 5 volts is
applied to the heated oxygen sensor (front)
output line via a resistor.

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

•

Heated oxygen sensor (front) deteriorated.

•

Open circuit in heated oxygen sensor (front)
output line.

•

Open circuit in heated oxygen sensor (front)
ground line.

•

PCM failed.

DIAGNOSIS

Required Special Tools
MB991502: Scan Tool (MUT-II)
MD998464: Test Harness

STEP 1. Using scan tool MB991502, check data list item 11:
Heated Oxygen Sensor (front).

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991502 to the data reading mode for item

11, Heated Oxygen Sensor (front).

•

Warming up the engine. When the engine is revved, the
output voltage should be 0.6 to 1.0 volt.

•

Warming up the engine. When the engine is idling, the
output voltage should repeat 0.4 volt and 0.6 to 1.0 volt
alternately.

(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.00-8

).

NO : Go to Step 2.

AC003081 AB

16 PIN

MB991502

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-107

STEP 2. Check the sensor output voltage at heated oxygen
sensor (front) connector B-15 by backprobing.
(1) Do not disconnect the connector B-15.
(2) Start the engine and run at idle.
(3) Measure the voltage between terminal 4 and ground by

backprobing.

•

Warming up the engine. When the engine is 2,500 r/min,
the output voltage should repeat 0 to 0.8 volt alternately.

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the voltage normal?

YES : Go to Step 3.
NO : Go to Step 7.

STEP 3. Check the sensor output voltage at PCM
connector C-41 by backprobing.
(1) Do not disconnect the connector C-41.
(2) Start the engine and run at idle.
(3) Measure the voltage between terminal 71 and ground by

backprobing.

•

Warming up the engine. When the engine is 2,500 r/min,
the output voltage should repeat 0 to 0.8 volt alternately.

(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the voltage normal?

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

STEP 4. Check connector B-15 at heated oxygen sensor
(front) and connector C-41 at PCM 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 15.

AKX01541

B-15 CONNECTOR
HARNESS SIDE VIEW

1 2
3 4

AH

AK000288

C-41 CONNECTOR
HARNESS SIDE VIEW

71
78
90

72
79

73
80

91

74
81

75
87

92

76
88
97

77
89
98

82
93

83 84
94

85
95

86
96

AC

AK000556 AB

CONNECTOR:B-15

AK000280

CONNECTOR : C-41

PCM

AY

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-108

STEP 5. Using scan tool MB991502, check data list item 11:
Heated Oxygen Sensor (front).

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991502 to the data reading mode for item

11, Heated Oxygen Sensor (front).

•

Warming up the engine. When the engine is revved, the
output voltage should be 0.6 to 1.0 volt.

•

Warming up the engine. When the engine is idling, the
output voltage should repeat 0.4 volt and 0.6 to 1.0 volt
alternately.

(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.00-8

).

NO : Replace the PCM. Then go to Step 15.

STEP 6. Check connector B-15 at heated oxygen sensor
(front) and connector C-41 at PCM for damage.
Q: Is the connector in good condition?

YES : Repair harness wire between heated oxygen sensor

(front) connector B-15 terminal 4 and PCM connector
C-41 terminal 71 because of open circuit or harness
damage. Then go to Step 15.

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

Connector Inspection (

P.00E-2

). Then go to Step 15.

AC003081 AB

16 PIN

MB991502

AK000556 AB

CONNECTOR:B-15

AK000280

CONNECTOR : C-41

PCM

AY