Mitsubishi Lancer Evolution IX. Manual - part 474

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-371

STEP 22. Check harness between B-103 (terminal 
No. 3) ignition coil connector and C-121 (terminal 
No. 12) engine-ECU connector, also between 
B-114 (terminal No. 3) ignition coil connector and 
C-121 (terminal No. 11) engine-ECU connector.

• Check output line for damage.

Q: Is the check result normal? 

YES : 

Go to Step 17 .

NO : 

Repair the damaged harness wire.

AK305047

1

2

3

Connector : B-103, B-114

B-114(GR)

B-103(GR)

AB

Harness side 
connector

AK502033

2

3

4

5

6

7

8

9

11

12

13

14

15

16

17

18

19

20

30

21

22

23

24

25

26

27

28

29

31

32

33

34

35

1

10

C-121 (GR)

AB

Connector: C-121

Harness side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-372

DATA LIST REFERENCE TABLE

M1131152002117

Item 
No.

Inspection 
item

Inspection condition

Normal condition

Inspection 
procedure 
No.

Reference 
page

11

Oxygen 
sensor

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

Excessive deceleration 
from 4,000 r/min

200 mV or less

Code No. 
P0130

P.13A-7
5

At excessive 
acceleration

600 

− 1,000 mV

Engine: After 
warm-up (using 
oxygen sensor, 
check air-fuel ratio 
as well as control 
status by 
engine-ECU.

Idle operation

400 mV or less 
⇔ 600 − 1,000 
mV (altered)

2,500 r/min

12

Air flow 
sensor *

1

• Engine coolant 

temperature: 80 
−95°C

• Lamps, electric 

cooling fan and 
all accessories: 
OFF

• Transmission: 

Neutral

Idle operation

17 

− 43 Hz

−

−

2,500 r/min

40 

− 100 Hz

Acceleration

According to 
acceleration, 
frequency is 
amplified.

13

Intake air 
temperature 
sensor

Ignition switch: 
"ON" or engine 
running

Intake air temperature: 
−20°C

−20°C

Code No. 
P0110

P.13A-4
5

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

14

Throttle 
position 
sensor

Ignition switch: 
"ON"

Release accelerator 
pedal fully

535 

− 735 mV

Code No. 
P0120

P.13A-6
0

Depress accelerator 
pedal gradually

Increased 
according to 
accelerator pedal 
stroke

Depress accelerator 
pedal fully

4,500 

− 5,000 

mV

16

Power 
supply 
voltage

Ignition switch: "ON"

System voltage

Procedure 
No. 23

P.13A-3
02

18

Cranking 
signal 
(ignition 
switch-ST)

Ignition switch: 
"ON"

Engine: Stopped

OFF

Procedure 
No. 23

P.13A-3
02

Engine: Cranking

ON

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-373

21

Engine 
coolant 
temperature 
sensor

Ignition switch: 
"ON" or engine 
running

Coolant temperature: 
−20°C

−20°C

Code No. 
P0115

P.13A-5
2

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

Crank angle 
sensor

• Engine: 

Cranking

• Tachometer: 

Connected

Compare engine speed 
on tachometer with the 
value displayed on 
M.U.T.-II/III

Matched

−

−

Engine: Idle 
operation

Coolant temperature: 
−20°C

1,200 

− 1,400 

r/min

Coolant temperature: 
0

°C

1,200 

− 1,400 

r/min

Coolant temperature: 
20

°C

1,200 

− 1,400 

r/min

Coolant temperature: 
40

°C

1,050 

− 1,250 

r/min

Coolant temperature: 
80

°C

750 

− 950 r/min

25

Barometric 
pressure 
sensor

Ignition switch: 
"ON"

Altitude: 0 m

101 kPa

Code 
No.P0105

P.13A-3
5

Altitude: 600 m

95 kPa

Altitude: 1,200 m

88 kPa

Altitude: 1,800 m

81 kPa

27

Power 
steering fluid 
pressure 
switch

Engine: Idle 
operation

Steering wheel: Not 
operated

OFF

Code 
No.P0551

P.13A-1
97

Steering wheel: 
Operated

ON

28

A/C switch

Engine: Idle

AC switch: OFF

OFF

Procedure 
No. 27

P.13A-3
41

AC 
switch: 
ON

A/C 
compressor is 
not driven

OFF

A/C 
compressor is 
driven

ON

34

Air flow 
sensor reset 
signal

Engine: After 
engine warm-up

Idle operation

ON

Code No. 
P0100

P.13A-2
4

3,000 r/min

OFF

Item 
No.

Inspection 
item

Inspection condition

Normal condition

Inspection 
procedure 
No.

Reference 
page

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-374

37

Volumetric 
efficiency 

• Engine coolant 

temperature: 80 
−95°C

• Lamps, electric 

cooling fan and 
all accessories: 
OFF

Idle operation

15 

− 35%

−

−

2,500 r/min

15 

− 35%

Excessive acceleration

According to 
acceleration, 
volumetric 
efficiency is 
increased.

41

Injectors *

2

Engine: Cranking

Coolant temperature: 
0

°C (all cylinders in 

simultaneous injecting 
operation)

18 

− 307 ms

−

−

Coolant temperature: 
20

°C

7.0 

− 12 ms

Coolant temperature: 
80

°C

2.9 

− 4.9 ms

Injectors *

3

• Engine coolant 

temperature: 80 
−95°C

• Lamps, electric 

cooling fan and 
all accessories: 
OFF

• Transmission: 

Neutral

Idle operation 

1.5 

− 2.7 ms

2,500 r/min

1.2 

− 2.4 ms

Excessive acceleration

Increased

44

Ignition 
advance

• Engine: After 

warm-up

• Install timing 

light (for use to 
measure actual 
ignition timing)

Idle operation

0 

− 10° BTDC

−

−

2,500 r/m

20 

− 40° BTDC

45

Idle speed 
control 
(stepper 
motor) servo 
position *

4

• Engine coolant 

temperature: 80 
−95°C

• Lighting, electric 

cooling fan and 
accessories: 
OFF

• Transmission: 

Neutral

• Engine: Idle 

operation (When 
A/C switch is 
ON, A/C 
compressor 
must be ON)

A/C switch: OFF

2 

− 25 steps

−

−

A/C switch: OFF 

→ ON Increased 10 − 

70 steps

Item 
No.

Inspection 
item

Inspection condition

Normal condition

Inspection 
procedure 
No.

Reference 
page