Mitsubishi Grandis. Manual — part 694

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-27

STEP 7. Check harness between B-106 (terminal
No. 4) air flow sensor connector and C-113
(terminal No. 96) engine-ECU <M/T> connector or
engine-A/T-ECU <A/T> connector.

NOTE: Before checking harness, check intermediate
connector C-116, and repair if necessary.

• Check earthing line for open circuit.

Q: Is the check result normal?

YES :

Go to Step 8 .

NO :

Repair.

STEP 8. MUT-III data list

• Refer to Data List Reference Table

P.13A-363

.

a. Item 12: Air flow sensor

Q: Is the check result normal?

YES :

Intermittent malfunction (Refer to GROUP

00

− How to Use

Troubleshooting/Inspection Service Points

P.00-5

).

NO :

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

STEP 9. Connector check: C-112 engine-ECU
<M/T> connector or engine-A/T-ECU <A/T>
connector.

Q: Is the check result normal?

YES :

Go to Step 10 .

NO :

Repair or replace.

AK300969

2

1

3

4

Harness side connector

AC

Connector: B-106

B-106 (GR)

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

AK305617

Connector: C-112

C-112 (GR)

C-112 (GR)

AB

Harness side connector

<R.H. drive vehicles>

<L.H. drive vehicles>

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-28

STEP 10. Check harness between B-106 (terminal
No. 3) air flow sensor connector and C-112
(terminal No. 63) engine-ECU <M/T> connector or
engine-A/T-ECU <A/T> connector.

• Check output line for open/short circuit and

damage.

Q: Is the check result normal?

YES :

Go to Step 11 .

NO :

Repair.

STEP 11. Connector check: B-15X engine control
relay connector

Q: Is the check result normal?

YES :

Go to Step 12 .

NO :

Repair or replace.

STEP 12. Check harness between B-106 (terminal
No. 2) air flow sensor connector and B-15X
(terminal No. 1) engine control relay connector.

NOTE: Before checking harness, check intermediate
connector C-116, and repair if necessary.

• Check power supply line for damage.

Q: Is the check result normal?

YES :

Go to Step 13 .

NO :

Repair.

AK300969

2

1

3

4

Harness side connector

AC

Connector: B-106

B-106 (GR)

AK305617

Connector: C-112

C-112 (GR)

C-112 (GR)

AB

Harness side connector

<R.H. drive vehicles>

<L.H. drive vehicles>

AK300967

2

1

3

4

AC

Harness side
connector

B-15X

Connector: B-15X

Relay box’s
triangle marks

AK300969

2

1

3

4

Harness side connector

AC

Connector: B-106

B-106 (GR)

AK300967

2

1

3

4

AC

Harness side
connector

B-15X

Connector: B-15X

Relay box’s
triangle marks

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-29

STEP 13. MUT-III data list

• Refer to Data List Reference Table

P.13A-363

.

a. Item 12: Air flow sensor

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 14 .

STEP 14. Replace air flow sensor.

• After replacing the air flow sensor, re-check the

trouble symptoms.

Q: Is the check result normal?

YES :

Replace the engine-ECU <M/T> or

engine-A/T-ECU <A/T>.

NO :

Check end.

Code No. P0105: Barometric Pressure Sensor System

FUNCTION

• The barometric pressure sensor converts the

barometric pressure into a voltage signal and
inputs the signal to the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.

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

or engine-A/T-ECU <A/T>. corrects the fuel
injection amount, etc.

TROUBLE JUDGMENT

Check Conditions

• 2 seconds later after the ignition switch has been

in "ON" position or the engine has started up.

• The battery voltage is 8 V or more.

Judgment Criteria

• The sensor output voltage is 4.5 V or more

(Baromatric pressure of above 114 kPa or
equivalent) for 2 seconds.

or

• The sensor output voltage is 0.2 V or less

(Baromatric pressure of below 53 kPa or
equivalent) for 2 seconds.

PROBABLE CAUSE

• Failed barometric pressure sensor

DIAGNOSIS PROCEDURE

STEP 1. MUT-III diagnosis code

Q: Diagnosis code set?

YES :

Replace engine-ECU <M/T> or

engine-A/T-ECU <A/T>.

NO :

Inspection chart for diagnosis code (Refer to

P.13A-20

).

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-30

Code No. P0110: Intake Air Temperature Sensor System

OPERATION

• A power voltage of 5 V is applied to the intake air

temperature sensor output terminal (terminal No.
1) of the air flow sensor connector from the
engine-ECU <M/T> or engine-A/T-ECU <A/T>
(terminal No. 99).

• The power voltage is earthed to the engine-ECU

<M/T> or engine-A/T-ECU (terminal No. 96) from
the air flow sensor (terminal No. 4).

FUNCTION

• The intake air temperature sensor converts the

intake air temperature into a voltage and inputs
the voltage signal to the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.

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

or engine-A/T-ECU <A/T> corrects the fuel
injection amount, etc.

• The intake air temperature sensor is a kind of

resistor, which has characteristics to reduce its
resistance as the intake air temperature rises.
Therefore, the sensor output voltage varies with
the intake air temperature, and becomes lower as
the intake air temperature rises.

TROUBLE JUDGMENT

Check Conditions

• 2 seconds later after the ignition switch has been

in ON position or the engine has started up.

• The battery voltage is 8 V or more.

Judgment Criteria

• The sensor output voltage is 4.6V or more (intake

air temperature of below -45

°C or equivalent) for

4 seconds.

Or

• The sensor output voltage is 0.2V or less (intake

air temperature of above 125

°C or equivalent) for

4 seconds.

AK305601

1

2

3 4

9192

939495

96979899

100

105

113114

115116117

118119120

106

107108109

110111112

101102103

104

AB

96

99

Intake air temperature sensor
(Integrated in air flow sensor)

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

4

1

5 V

Intake air temperature sensor circuit

30

33

J/C (4)

C-116

BR

BR

Y-L

B-106

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