Mitsubishi Lancer Evolution X. Manual - part 441

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-829

Relative 
TP 
sensor

BC

Relative 
throttle 
position 
sensor

• Remove 

the intake 
air hose at 
the throttle 
body

• Disconnect 

the throttle 
position 
sensor 
connector, 
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

0 − 5 %

−

−

Fully open the 
throttle valve 
with your 
finger

88 % or more

Short 
term fuel 
trim (bank 
1)

28

Short-term fuel 
trim

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

− 25 to 25 %

Code No. 
P0171, 
P0172

P.13A-267

, 

P.13A-273

Spark 
advance

16

Ignition timing 
advance

• Engine: 

warming up

• Timing light 

is set (to 
check 
actual 
ignition 
timing)

• Transaxle: 

neutral 
(TC-SST: 
"P" range)

Engine is 
idling

2 − 18°  CA

 (BTDC)

−

−

2,500 r/min

34 − 46°  CA

 (BTDC)

Starter 
relay

102

Starter relay

Ignition switch: "ON"

OFF

Procedure 
No. 24 
<M/T>, 25 
<TC-SST>

P.13A-784

 

<M/T>, 

P.13A-796

 

<TC-SST>

Engine: Cranking

ON

M.U.T.-III 
SCAN 
TOOL 
DISPLAY

ITEM 
NO. 

INSPECTION 
ITEM

INSPECTION REQUIREMENT

NORMAL 
CONDITION

INSPECTION 
PROCEDURE 
NO.

REFERENCE 
PAGE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-830

Target 
ETV 
value

59

Throttle 
actuator 
control motor 
target value

Engine: warming up

• The target opening 

degree of the throttle 
valve is shown.

• "0 V" means "fully closed 

throttle valve" and "5 V" 
means "fully opened 
throttle valve".

0 − 5 V 

(Display 
range)

−

−

Target 
idle 
speed

3

Target idle 
speed

Engine: idling

Engine coolant 
temperature is 
− 20° C (− 4° F)

1,300 − 1,500 

r/min

−

−

Engine coolant 
temperature is 
0° C (32° F)

1,300 − 1,500 

r/min

Engine coolant 
temperature is 
20° C (68° F)

1,300 − 1,500 

r/min

Engine coolant 
temperature is 
40° C (104° F)

1,200 − 1,400 

r/min

Engine coolant 
temperature is 
80° C (176° F)

600 − 800 

r/min

Throttle 
actuator

58

Throttle 
actuator 
control motor

Engine: warming up

• The target opening 

degree of the throttle 
valve is shown.

• "0 %" means "fully closed 

throttle valve" and "100 
%" means "fully opened 
throttle valve".

0 − 100 % 

(Display 
range)

−

−

M.U.T.-III 
SCAN 
TOOL 
DISPLAY

ITEM 
NO. 

INSPECTION 
ITEM

INSPECTION REQUIREMENT

NORMAL 
CONDITION

INSPECTION 
PROCEDURE 
NO.

REFERENCE 
PAGE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-831

TP 
sensor 
(main)

13

Throttle 
position 
sensor (main)

• Remove 

the intake 
air hose at 
the throttle 
body

• Disconnect 

the throttle 
position 
sensor 
connector, 
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-201

, 

P.13A-205

Fully open the 
throttle valve 
with your 
finger

4,000 mV or 
more

Engine: 
warming up, 
idling

No load

500 − 660 mV

A/C switch: 
"OFF" → "ON"

Voltage rises

Shift lever: "N" 
→ "D" range 

<TC-SST>

M.U.T.-III 
SCAN 
TOOL 
DISPLAY

ITEM 
NO. 

INSPECTION 
ITEM

INSPECTION REQUIREMENT

NORMAL 
CONDITION

INSPECTION 
PROCEDURE 
NO.

REFERENCE 
PAGE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-832

TP 
sensor 
(main)

AB

Throttle 
position 
sensor (main)

• Remove 

the intake 
air hose at 
the throttle 
body

• Disconnect 

the throttle 
position 
sensor 
connector, 
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

6 − 14 %

Code No. 
P0122, 
P0123

P.13A-201

, 

P.13A-205

Fully open the 
throttle valve 
with your 
finger

80 % or more

TP 
sensor 
(main) 
learned 
value

14

Throttle 
position 
sensor (main) 
mid opening 
learning value

This item shows the throttle valve opening 
learning value when the vehicle enters into the 
limp home mode.

−

−

M.U.T.-III 
SCAN 
TOOL 
DISPLAY

ITEM 
NO. 

INSPECTION 
ITEM

INSPECTION REQUIREMENT

NORMAL 
CONDITION

INSPECTION 
PROCEDURE 
NO.

REFERENCE 
PAGE