Mitsubishi Eclipse. Manual - part 187

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-241

DTC P0132: Heated Oxygen Sensor Circuit High Voltage (sensor 1)

AK000657

4

1 2
3

BL

ACK

BL

ACK

WHITE

     B-17
MU802605

ENGINE CONTROL
MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL
MODULE (PCM) <A/T>

HEATED OXYGEN
SENSOR (FRONT)

FROM MFI RELAY

TO ECM
OR PCM

1

2

3

4

92 <M/T>
57 <A/T>*1

76 <M/T>
71 <A/T>*2

C-60 <M/T>
(MU803772)

C-54 <A/T>
(MU803781)

C-57 <A/T>
(MU803782)

NOTE
*1:PCM connector C-54 <A/T>
*2:PCM connector C-57 <A/T>

98

78

71

88 89

76 77

72
79
91

73
80

74

75

81
92

8283
93

8485

94

8687

9596

90

97

82

78

81

80

89 90 91 92

79

87

71

74

73

72

76

75

77

85

88

83 84

86

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

Heated Oxygen Sensor (front) Circuit

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-242

.

CIRCUIT OPERATION

• A voltage corresponding to the oxygen concen-

tration in the exhaust gas is sent to the ECM (ter-
minal No. 76) <M/T> or PCM (terminal No. 71) 
<A/T> from the output terminal (terminal No. 4) of 
the heated oxygen sensor (front).

• Terminal No. 2 of the heated oxygen sensor 

(front) is grounded with ECM (terminal No. 92) 
<M/T> or PCM (terminal No. 57) <A/T>.

.

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 ECM <M/T> or PCM 
<A/T>.

• When the heated oxygen sensor (front) begins to 

deteriorate, the heated oxygen sensor signal 
response becomes poor.

• The ECM <M/T> or PCM <A/T> 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 ECM 
<M/T> or PCM <A/T> also checks for an open 
circuit in the heated oxygen sensor (front) output 
line.

.

DESCRIPTIONS OF MONITOR METHODS
Heated oxygen sensor (front) output voltage is over 

specified range.

.

MONITOR EXECUTION
Continuous

.

MONITOR EXECUTION CONDITIONS (Other 
monitor and Sensor)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• Heated oxygen sensor heater (front) monitor

• Misfire monitor

• Fuel system monitor

Sensor (The sensor below is determined to be 

normal)

• Volume airflow sensor

• Engine coolant temperature sensor

• Intake air temperature sensor

• Barometric pressure sensor

• Throttle position sensor

.

AK300051AB

B-17 (B)

HEATED OXYGEN
SENSOR (FRONT)

CONNECTOR: B-17

AK300060

ECM

CONNECTOR: C-60 <M/T>

AE

C-60 (G)

AK300060

PCM

CONNECTORS: C-54, C-57 <A/T>

AI

C-57 (GR)

C-54 (GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-243

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• 2 seconds or more have passed since the start-

ing sequence was completed.

Judgment Criteria

• Heated oxygen sensor (front) output voltage has 

continued to be 1.2 volts or higher for 2 seconds.

.

OBD-ll DRIVE CYCLE PATTERN
Refer to Diagnosis Function 

− OBD-ll Drive Cycle − 

Procedure 6 

− Other Monitor 

P.13A-5

.

.

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

• Short circuit in heated oxygen sensor (front) out-

put line.

• Connector damage.

• ECM failed. <M/T>

• PCM failed. <A/T>

DIAGNOSIS

Required Special Tools:

• MB991958 (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

START

END

NO

NO

YES

YES

MALFUNCTION

GOOD

2secs HAVE PASSED?

OUTPUT VOLTAGE > 1.2V

NO

YES

MONITORING

CONDITIONS

AK301437

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-244

STEP 1. Check connector B-17 at heated oxygen sensor 
(front) and connector C-60 at ECM <M/T> or connector 
C-57 at PCM <A/T> for damage.
Q: Is the connector in good condition?

YES : Go to Step 2.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 3.

AK300403

1

2

3

4

AB

B-17 (B)

HEATED OXYGEN
SENSOR (FRONT)

CONNECTOR: B-17

HARNESS 
CONNECTOR:
COMPONENT 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