Mitsubishi Lancer Evolution VI. Manual — part 42

MPI –

Troubleshooting

13-56

DATA LIST REFERENCE TABLE

Item
No.

Inspection
item

Inspection contents

Normal condition

Inspection
procedure
No.

Reference
page

11

Oxygen
sensor

Engine:After having

warmed up

Air/fuel mixture is
made leaner when de-

When at 4,000 r/min,
engine is suddenly
decelerated

200 mV or less

Procedure
No. 31

13-42

made leaner when de-
celerating, and is made
richer when racing.

When engine is
suddenly raced

600 – 1,000 mV

Engine:After having

warmed up

The oxygen sensor
signal is used to check

Engine is idling

400 mV or less

(Changes)

signal is used to check
the air/fuel mixture
ratio, and control
condition is also
checked by the ECU.

2,500 r/min

600 – 1,000 mV

12

Air flow
sensor*

D

Engine coolant
temperature: 80 –

Engine is idling

17 – 43 Hz

–

–

sensor
<EVOLU-
TION-IV>

temperature: 80
95

_

C

D

Lamps, electric

li

f

d ll

2,500 r/min

46 – 86 Hz

p

cooling fan and all
accessories: OFF

D

Transmission:
Neutral (A/T:
P range)

Engine is raced

Frequency
increases in
response to
racing

12

Air flow
sensor*

D

Engine coolant
temperature: 80 –

Engine is idling

12 – 38 Hz

–

–

sensor
<EVOLU-
TION-V, VI>

temperature: 80
95

_

C

D

Lamps, electric

li

f

d ll

2,500 r/min

36 – 76 Hz

p

cooling fan and all
accessories: OFF

D

Transmission:
Neutral (A/T:
P range)

Engine is raced

Frequency
increases in
response to
racing

13

Intake air
temperature
sensor

Ignition switch: ON or
with engine running

When intake air
temperature is –20

_

C

–20

_

C

Code No.
13

13-9

sensor

When intake air
temperature is 0

_

C

0

_

C

When intake air
temperature is 20

_

C

20

_

C

When intake air
temperature is 40

_

C

40

_

C

When intake air
temperature is 80

_

C

80

_

C

NOTE
*:

In a new vehicle [driven approximately 500 km or less], the air flow sensor output frequency is sometimes
10% higher than the standard frequency.

MPI –

Troubleshooting

13-57

Item
No.

Inspection
item

Inspection contents

Normal condition

Inspection
procedure
No.

Reference
page

14

Throttle
position

Ignition switch: ON

Set to idle position

300 – 1,000 mV

Code No.
14

13-9

position
sensor

Gradually open

Increases in
proportion to
throttle opening
angle

14

Open fully

4,500 – 5,500 mV

16

Power
supply
voltage

Ignition switch: ON

System voltage

Procedure
No. 24

13-35

18

Cranking
signal

Ignition switch: ON

Engine: Stopped

OFF

Procedure
No. 27

13-38

g

(ignition
switch-ST)

Engine: Cranking

ON

21

Engine
coolant
temperature
sensor

Ignition switch: ON or
with engine running

When engine
coolant temperature
is –20

_

C

–20

_

C

Code No.
21

13-10

sensor

When engine
coolant temperature
is 0

_

C

0

_

C

When engine
coolant temperature
is 20

_

C

20

_

C

When engine
coolant temperature
is 40

_

C

40

_

C

When engine
coolant temperature
is 80

_

C

80

_

C

MPI –

Troubleshooting

13-58

Item
No.

Reference
page

Inspection
procedure
No.

Normal condition

Inspection contents

Inspection
item

22

Crank angle
sensor

D

Engine: Cranking

D

Tachometer:
Connected

Compare the engine
speed readings on
the tachometer and
the MUT-

II

.

Accord

–

–

D

Engine: Idling

D

Idle position
switch: ON

When engine
coolant temperature
is –20

_

C

1,300 – 1,500 rpm

When engine
coolant temperature
is 0

_

C

1,300 – 1,500 rpm

When engine
coolant temperature
is 20

_

C

1,300 – 1,500 rpm

When engine
coolant temperature
is 40

_

C

1,150 – 1,350 rpm

When engine
coolant temperature
is 80

_

C

750 – 950 rpm

25

Barometric
pressure

Ignition switch: ON

At altitude of 0 m

101 kPa

Code No.
25

13-14

pressure
sensor

At altitude of 600 m

95 kPa

25

At altitude of 1,200 m

88 kPa

At altitude of 1,800 m

81 kPa

26

Idle position
switch

Ignition switch: ON
Check by operating
accelerator pedal

Throttle valve:
Set to idle position

ON

Procedure
No. 26

13-38

accelerator pedal
repeatedly.)

Throttle valve:
Slightly open

OFF*

27

Power
steering fluid
pressure

Engine: Idling

Steering wheel
stationary

OFF

Procedure
No. 28

13-39

pressure
switch

Steering wheel
turning

ON

28

A/C switch

Engine: Idling
(when A/C switch is

A/C switch: OFF

OFF

Procedure
No. 29

13-39

(

C

tc

ON, A/C compressor
should be operating.)

A/C switch: ON

ON

NOTE
*:

The idle position switch normally turns off when the voltage of the throttle position sensor is 50 –
100 mV higher than the voltage at the idle position. If the throttle position switch turns back on
after the throttle valve has opened, the idle position switch and the throttle position sensor need
to be adjusted.

MPI –

Troubleshooting

13-59

Item
No.

Inspection
item

Inspection contents

Normal condition

Inspection
procedure
No.

Reference
page

41

Injectors*

1

<EVOLU-
TION-IV>

Engine: Cranking

When engine
coolant temperature
is 0

_

C (injection is

carried out for all
cylinders
simultaneously)

27 – 41 ms

–

–

When engine
coolant temperature
is 20

_

C

14 – 22 ms

When engine
coolant temperature
is 80

_

C

3.9 – 5.9 ms

Injectors*

2

<EVOLU-
TION-IV>

D

Engine coolant
temperature:
80–95

_

C

Engine is idling

1.2 – 2.4 ms

TION-IV>

80–95

_

C

D

Lamps, electric
cooling fan and all
accessories: OFF

2,500 r/min

1.0 – 2.2 ms

accessories: OFF

D

Transmission:
Neutral (A/T :
P range)

When engine is
suddenly raced

Increases

41

Injectors*

1

<EVOLU-
TION-V, VI>

Engine: Cranking

When engine
coolant temperature
is 0

_

C

27 – 40 ms

–

–

When engine
coolant temperature
is 20

_

C

14.5 – 21.7 ms

When engine
coolant temperature
is 80

_

C

3.8 – 5.6 ms

Injectors*

2

<EVOLU-
TION-V VI>

D

Engine coolant
temperature:
80–95

_

C

Engine is idling

0.9 – 2.1 ms

TION-V, VI>

80–95

_

C

D

Lamps, electric
cooling fan and all
accessories: OFF

2,500 r/min

0.7 – 1.9 ms

accessories: OFF

D

Transmission:
Neutral (A/T :
P range)

When engine is
suddenly raced

Increases

NOTE
*

1

: The injector drive time represents the time when the cranking speed is at 250 r/min or below when

the power supply voltage is 11 V.

*

2

: In a new vehicle [driven approximately 500 km or less], the injector drive time is sometimes 10%

longer than the standard time.