Mitsubishi Grandis. Manual — part 779

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-367

79

Throttle
position
sensor
(main)

• Remove the intake

air hose at the
throttle body

• Disconnect the

throttle position
sensor, and then
connect terminal
numbers No. 3,
No. 4, No. 5 and
No. 6 with the use
of the special tool:
MB991658.

• Ignition switch: ON

Fully close the
throttle valve with
your finger

300

− 700 mV Code No.

P0122,
P0123

P.13A-44
P.13A-48

Fully open the
throttle valve with
your finger

4,000 mV or
more

No load

500

− 700 mV

• Shift lever: "N" → "D" <A/ T>

Voltage rises

B4

Power
steering fluid
pressure
sensor

Engine: Idle
operation

Steering wheel: Not
operated

400

− 1,000

mV

Code No.
P0551

P.13A-196

Steering wheel:
Operated

Voltage rises

Full lock

3,000

− 4,000

mV

12
*

5

Air flow
sensor

• Engine coolant

temperature: 85

−

95

°C

• Lamps, electric

cooling fan and all
accessories: OFF

• Transmission:

Neutral <M/T>, "P"
range <A/T>

Idle operation

2.0

− 4.0 gm/s −

−

2,500 r/min

6.5

− 12.0

gm/s

Acceleration

According to
acceleration,
frequency is
amplified.

13
*

5

Intake air
temperature
sensor

Ignition switch: ON or
engine running

Intake air
temperature:
−20°C

−20°C

Code No.
P0110

P.13A-30

Intake air
temperature: 0

°C

0

°C

Intake air
temperature: 20

°C

20

°C

Intake air
temperature: 40

°C

40

°C

Intake air
temperature: 80

°C

80

° C

Item
No.

Inspection
item

Inspection condition

Normal
condition

Inspection
procedure
No.

Reference
page

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-368

21
*

5

Engine
coolant
temperature
sensor

Ignition switch: ON or
engine running

Coolant
temperature:
−20°C

−20°C

Code No.
P0115

P.13A-37

Coolant
temperature: 0

°C

0

°C

Coolant
temperature: 20

°C

20

°C

Coolant
temperature: 40

°C

40

°C

Coolant
temperature: 80

°C

80

°C

22
*

5

Crank angle
sensor

• Engine: Cranking

• Tachometer:

Connected

Compare engine
speed on
tachometer with the
value displayed on
MUT-III

Matched

−

−

Engine: Idle
operation

Coolant
temperature:
−20°C

1,280

− 1,480

r/min

Coolant
temperature: 0

°C

1,270

− 1,470

r/min

Coolant
temperature: 20

°C

1,230

− 1,430

r/min

Coolant
temperature: 40

°C

1,140

− 1,340

r/min

Coolant
temperature: 90

°C

600

− 800

r/min

24
*

5

Vehicle
speed
sensor

Drive 40 km/h

Approximately
40 km/h

−

−

44
*

5

Ignition
advance

• Engine: After

warm-up

• Install timing light

(for use to
measure actual
ignition timing)

Idle operation

2

− 18 deg

−

−

2,500 r/min

26

− 46 deg

81
*

5

Long-term
fuel
compensati
on cylinder
1, 4

Engine: After warm-up, 2,500 r/min without
any load (during closed loop)

−13 − 13 %

Code No.
P0170

P.13A-108

82
*

5

Shot-term
fuel
compensati
on cylinder
1, 4

Engine: After warm-up, 2,500 r/min without
any load (during closed loop)

−10 − 10 %

Code No.
P0170

P.13A-108

Item
No.

Inspection
item

Inspection condition

Normal
condition

Inspection
procedure
No.

Reference
page

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-369

83
*

5

Long-term
fuel
compensati
on cylinder
2, 3

Engine: After warm-up, 2,500 r/min without
any load (during closed loop)

−13 − 13 %

Code No.
P0173

P.13A-111

84
*

5

Short-term
fuel
compensati
on cylinder
2, 3

Engine: After warm-up, 2,500 r/min without
any load (during closed loop)

−10 − 10 %

Code No.
P0173

P.13A-111

87
*

5

Calculation
load value

Engine: After
warm-up

Idle operation

15

− 40 %

−

−

2,500 r/min

15

− 40 %

88
*

5

Fuel control
condition
cylinder 1, 4

Engine: After
warm-up

2,500 r/min

Closed loop

−

−

Acceleration

Open
loop-drive
condition

89
*

5

Fuel control
condition
cylinder 2, 3

Engine: After
warm-up

2,500 r/min

Closed loop

−

−

Acceleration

Open
loop-drive
condition

8A
*

5

Throttle
position
sensor
(main) *

4

• Remove the intake

air hose at the
throttle body

• Disconnect the

throttle position
sensor, and then
connect terminal
numbers No. 3,
and No. 4, No. 5
and No. 6 with the
use of the special
tool: MB991658.

• Ignition switch: ON

Fully close the
throttle valve with
your finger

0

− 12 %

Code No.
P0122,
P0123

P.13A-44
P.13A-48

Fully open the
throttle valve with
your finger

75

− 100 %

A1
*

5

Cylinder 1,4
oxygen
sensor
(front)

Engine: After
warm-up (leaner by
deceleration, richer
by acceleration)

Excessive
deceleration from
4,000 r/min

0.2 V or less

Code No.
P0130

P.13A-57

At excessive
acceleration

0.6

− 1 V

Engine: After
warm-up (using
oxygen sensor, check
air-fuel ratio as well
as control status by
engine-ECU <M/T>
or engine-A/T-ECU
<A/T>)

Idle operation

0.4 V or less
⇔ 0.6 − 1 V
(altered)

2,500 r/min

Item
No.

Inspection
item

Inspection condition

Normal
condition

Inspection
procedure
No.

Reference
page

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-370

CAUTION

When shifting the select lever to D range, the brakes should be applied so that the vehicle does not
move forward
NOTE: *1: On the new vehicle (mileage: 500 km or less), air flow sensor output frequency may be higher by
approx. 10%.
NOTE: *2: Injector drive time ranges shown are when power voltage is 11 V and the cranking speed is 250
r/min. or less.
NOTE: *3: On the new vehicle (mileage: 500 km or less), injector drive time may be longer by approx. 10%.
NOTE: *4: After the inspection has been completed, disconnect the throttle actuator control motor connector,
and then use the MUT-III to delete the diagnosis code that was recorded during the inspection.
NOTE: *5: When service data in check mode is selected, the data is not displayed.

A2
*

5

Cylinder 1,4
oxygen
sensor
(rear)

Engine: After
warm-up

At excessive
acceleration (during
the increase in the
engine speed)

0 V or less

⇔

0.6

− 1 V

(altered)

Code No.
P0136

P.13A-69

A3
*

5

Cylinder 2,3
oxygen
sensor
(front)

Engine: After
warm-up (leaner by
deceleration, richer
by acceleration)

Excessive
deceleration from
4,000 r/min

0.2 V or less

Code No.
P0150

P.13A-82

At excessive
acceleration

0.6

− 1 V

Engine: After
warm-up (using
oxygen sensor, check
air-fuel ratio as well
as control status by
engine-ECU <M/T>
or engine-A/T-ECU
<A/T>)

Idle operation

0.4 V or less
⇔ 0.6 − 1V
(altered)

2,500 r/min

A4
*

5

Cylinder 2,3
oxygen
sensor
(rear)

Engine: After
warm-up

At excessive
acceleration (during
the increase in the
engine speed)

0.6

− 1 V

Code No.
P0156

P.13A-95

A9
*

5

MIL distance Running distance in the engine warning light on

−

−

Item
No.

Inspection
item

Inspection condition

Normal
condition

Inspection
procedure
No.

Reference
page