Mitsubishi Grandis. Manual — part 712

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-99

STEP 8. Check cylinder 2, 3 oxygen sensor (rear)
itself

• Check cylinder 2, 3 oxygen sensor (rear) itself

(Refer to

P.13A-391

).

Q: Is the check result normal?

YES :

Go to Step 9 .

NO :

Replace cylinder 2, 3 oxygen sensor (rear).

STEP 9. Connector check: C-113 engine-ECU
<M/T> connector or engine-A/T-ECU <A/T>
connector

Q: Is the check result normal?

AK305616AB

Connector: C-113

<L.H. drive vehicles>

<R.H. drive vehicles>

C-113 (GR)

C-113 (GR)

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

Harness side connector

AK300977

1

2

3

4

AC

Connector: B-18

Harness side
connector

B-18 (B)

Cylinder 2, 3
oxygen sensor
(rear)

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-100

YES :

Check and repair harness between B-18

(terminal No. 4) cylinder 2, 3 oxygen sensor
(rear) connector and C-113 (terminal No.
116) engine-ECU <M/T> connector or
engine-A/T-ECU <A/T> connector.

• Check output line for damage.

NO :

Repair or replace.

STEP 10. Perform voltage measurement at C-113
engine-ECU <M/T> connector or engine-A/T-ECU
<A/T> connector.

• Measure engine-ECU <M/T> or engine-A/T-ECU

<A/T> terminal voltage.

• Transmission: Neutral <M/T> or P range <A/T>

• Engine: After warm-up

• Voltage between terminal No. 116 and earth.

OK:

When the engine is 2,500 r/min, the output

voltage should repeat 0 to 0.8 V alternately.

Q: Is the check result normal?

YES :

Go to Step 12 .

NO :

Go to Step 11 .

STEP 11. Connector check: C-113 engine-ECU
<M/T> connector or engine-A/T-ECU <A/T>
connector

Q: Is the check result normal?

AK305616AB

Connector: C-113

<L.H. drive vehicles>

<R.H. drive vehicles>

C-113 (GR)

C-113 (GR)

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

Harness side connector

AK305616AB

Connector: C-113

<L.H. drive vehicles>

<R.H. drive vehicles>

C-113 (GR)

C-113 (GR)

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

Harness side connector

AK300977

1

2

3

4

AC

Connector: B-18

Harness side
connector

B-18 (B)

Cylinder 2, 3
oxygen sensor
(rear)

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-101

YES :

Check and repair harness between B-18

(terminal No. 4) cylinder 2, 3 oxygen sensor
(rear) connector and C-113 (terminal No.
116) engine-ECU <M/T> connector or
engine-A/T-ECU <A/T> connector.

• Check output line for open circuit.

NO :

Repair or replace.

STEP 12. Connector check: C-113 engine-ECU
<M/T> connector or engine-A/T-ECU <A/T>
connector

Q: Is the check result normal?

YES :

Go to Step 6 .

NO :

Repair or replace.

AK305616AB

Connector: C-113

<L.H. drive vehicles>

<R.H. drive vehicles>

C-113 (GR)

C-113 (GR)

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

Harness side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-102

Code No. P0161: Cylinder 2, 3 Oxygen Sensor (Rear)Heater System

OPERATION

• Power is supplied to the heater power terminal

(terminal No. 1) of the cylinder 2, 3 oxygen
sensor (rear) connector from the engine control
relay (terminal No. 1).

• The heater (terminal No. 3) of the cylinder 2, 3

oxygen sensor (rear) connector is controlled by
the power transistor in the engine-ECU <M/T> or
engine-A/T-ECU <A/T> (terminal No. 18).

FUNCTION

• The power supply to the cylinder 2, 3 oxygen

sensor (rear) heater is controlled by the ON/OFF
control of the power transistor in the engine-ECU
<M/T> or engine-A/T-ECU <A/T>.

• Heating the cylinder 2, 3 oxygen sensor (rear)

heater enables the cylinder 2, 3 oxygen sensor
(rear) to provide good response even when the
exhaust emission temperature is low.

AK305558

1

2

3

4

1

2

3

5

6 7 8 9

4

20

21 22

232425

2627

10111213

14 15

16 1718

19

1

2

3

4

AB

4

3

1

2

Cylinder 2, 3 oxygen sensor (rear)

1

2

3

4

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

18

Engine
control
relay

W-G

R-W

R-W

P-B

W-G

Battery

B-15X

C-110

(MU803802)

Cylinder 2, 3 oxygen sensor (rear) heater circuit

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

B-18

MU802605

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

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

11

6

J/C (4)
C-116