Mitsubishi Grandis. Manual - part 701

 

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Mitsubishi Grandis. Manual - part 701

 

 

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-55

STEP 15. Connector check: B-15X engine control 
relay connector and C-110 engine-ECU <M/T> 
connector or engine-A/T-ECU <A/T> connector.

Q: Is the check result normal?

YES : 

 Go to Step 16 .

NO : 

Repair or replace.

STEP 16. Check harness between B-15X engine 
control relay connector and injector connector.

a. Check intermediate connector C-116, and repair 

if necessary. If intermediate connector isnormal, 
check harness between B-15X (terminal No. 1) 
engine control relay connector and B-101 
(terminal No. 1) No. 1 injector connector.

b. Check intermediate connector C-116, and repair 

if necessary. If intermediate connector isnormal, 
check harness between B-15X (terminal No. 1) 
engine control relay connector and B-102 
(terminal No. 1) No. 2 injector connector.

c. Check intermediate connector C-116, and repair 

if necessary. If intermediate connector isnormal, 
check harness between B-15X (terminal No. 1) 
engine control relay connector and B-104 
(terminal No. 1) No. 3 injector connector.

d. Check intermediate connector C-116, and repair 

if necessary. If intermediate connector isnormal, 
check harness between B-15X (terminal No. 1) 
engine control relay connector and B-105 
(terminal No. 1) No. 4 injector connector.

NOTE: Before checking harness, check intermediate 

connector C-116, and repair if necessary.

• Check power supply line for damage.

Q: Are the check results normal?

YES : 

 Go to Step 17 .

NO : 

Repair.

AK300967

2

1

3

4

AC

Harness side
connector

B-15X

Connector: B-15X

Relay box’s
triangle marks

AK305618AB

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

Connector: C-110

<L.H. drive vehicles>

<R.H. drive vehicles>

C-110 (GR)

C-110 (GR)

Harness side connector

AK300967

2

1

3

4

AC

Harness side
connector

B-15X

Connector: B-15X

Relay box’s
triangle marks

AK300978

M

1

2

AG

Harness side connector

Connectors: B-101, B-102, B-104, B-105

B-101 (GR) B-102 (GR)

B-105 (GR)

B-104 (GR)

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-56

STEP 17. Check harness between injector 
connector and C-110 engine-ECU connector.

a. Check harness between B-101 (terminal No. 2) 

No. 1 injector connector and C-110 (terminal No. 
1) engine-ECU <M/T> connector or 
engine-A/T-ECU <A/T> connector.

b. Check harness between B-102 (terminal No. 2) 

No. 2 injector connector and C-110 (terminal No. 
5) engine-ECU <M/T> connector or 
engine-A/T-ECU <A/T> connector.

c. Check harness between B-104 (terminal No. 2) 

No. 3 injector connector and C-110 (terminal No. 
14) engine-ECU <M/T> connector or 
engine-A/T-ECU <A/T> connector.

d. Check harness between B-105 (terminal No. 2) 

No. 4 injector connector and C-110 (terminal No. 
21) engine-ECU <M/T> connector or 
engine-A/T-ECU <A/T> connector.

• Check output line for damage.

Q: Are the check results normal?

YES : 

 Go to Step 18 .

NO : 

Repair.

STEP 18. Fuel pressure measurement.

• Fuel pressure measurement (Refer to Fuel 

Pressure Test 

P.13A-383

).

Q: Is the check result normal?

YES : 

Repair.

NO : 

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

AK300978

M

1

2

AG

Harness side connector

Connectors: B-101, B-102, B-104, B-105

B-101 (GR) B-102 (GR)

B-105 (GR)

B-104 (GR)

AK305618AB

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

Connector: C-110

<L.H. drive vehicles>

<R.H. drive vehicles>

C-110 (GR)

C-110 (GR)

Harness side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-57

Code No. P0130: Cylinder 1, 4 Oxygen Sensor (Front) System

OPERATION

• The sensor signal is inputted to the engine-ECU 

<M/T> or engine-A/T-ECU <A/T> (terminal No. 
109) from the cylinder 1, 4 oxygen sensor (front) 
output terminal (terminal No. 4).

• The cylinder 1, 4 oxygen sensor (front) (terminal 

No. 2) is earthed with engine-ECU <M/T> or 
engine-A/T-ECU <A/T> (terminal No. 96).

FUNCTION

• The cylinder 1, 4 oxygen sensor (front) converts 

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

• When the air-fuel ratio is richer than the 

theoretical air-fuel ratio, the cylinder 1, 4 oxygen 
sensor (front) 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.

AK305551

9192

939495

96979899

100

105

113114

115116117

118119120

106

107108109

110111112

101102103

104

1

2

3

4

Cylinder 1, 4 oxygen
sensor (front)

AB

Cylinder 1, 4 oxygen sensor circuit (front)

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

6

B

L

P

From engine control relay

1

2

3

4

96

109

     B-22
MU802665

C-113

(MU803805)

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

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

C-115

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-58

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

or engine-A/T-ECU <A/T> controls the fuel 
injection amount so that the air-fuel ratio can be 
equivalent to the theoretical air-fuel ratio.

TROUBLE JUDGMENT

Check Conditions

• Above 3 minutes later after the engine has 

started up.

• The engine coolant temperature is approx. 82°C 

or higher.

• The engine speed is 1200 r/min or more.

• The monitoring time is 5 seconds.

Judgment Criteria

• When the cylinder 1, 4 oxygen sensor (front) 

output voltage is 0.2 V or less and a power 
voltage of 5 V is applied to the cylinder 1, 4 
oxygen sensor (front) in the engine-ECU <M/T> 
or engine-A/T-ECU <A/T>, the sensor output 
voltage is 4.5V or more.

• To be monitored once per driving cycle.

Check Conditions

• The engine speed is 1200 − 3000 r/min.

• The engine coolant temperature is approx. 60°C 

or higher.

• Volumetric efficiency is 20 − 60 %.

• During the air-fuel ratio feedback control

Judgment Criterion

• When the cylinder 1, 4 oxygen sensor (front) 

output frequency is 6 or less for 10 seconds on 
the average.

PROBABLE CAUSE

• Failed cylinder 1, 4 oxygen sensor (front)

• Open/short circuit in cylinder 1, 4 oxygen sensor 

(front) heater circuit or loose connector contact

• Failed engine-ECU <M/T>

• Failed engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE

STEP 1. MUT-III data list

• Refer to Data List Reference Table 

P.13A-363

.

a. Item 11: Cylinder 1, 4 oxygen sensor (front)

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use 

Troubleshooting/Inspection Service Points 

P.00-5

).

NO : 

Go to Step 2 .

STEP 2. Connector check: B-22 cylinder 1, 4 
oxygen sensor (front) connector

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace.

STEP 3. Perform resistance measurement at B-22 
cylinder 1, 4 oxygen sensor (front) connector.

• Disconnect connector, and measure at harness 

side.

• Resistance between terminal No. 2 and earth.

OK: 2 

Ω or less

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Go to Step 4 .

AK300973

1

2

3

4

AB

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ƒRƒlƒNƒ^![

B-24 (

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ƒRƒlƒNƒ^![

ƒRƒlƒNƒ^![: B-24

Harness side
connector

B-22 (GR)

Connector: B-22

Cylinder 1, 4 oxygen
sensor (front)

AC

AK300973

1

2

3

4

AB

ƒn![ƒlƒX‘¤

ƒRƒlƒNƒ^![

B-24 (

"•)

ƒRƒlƒNƒ^![

ƒRƒlƒNƒ^![: B-24

Harness side
connector

B-22 (GR)

Connector: B-22

Cylinder 1, 4 oxygen
sensor (front)

AC

 

 

 

 

 

 

 

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