Mitsubishi Colt Ralliart. Manual — part 96

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-338

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), injector drive time may be longer by approximately
10%.
NOTE: *2: When service data in check mode is selected, the data is not displayed.

A1

*2

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-62

At excessive
acceleration

0.6

− 1.0 V

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

Idle operation

0.4 V or less
⇔ 0.6 − 1.0 V

2,500 r/min

A2

*2

Oxygen
sensor
(rear)

Engine: After warm-up At excessive

acceleration

0.2

− 0.8 V

(After several
seconds have
elapsed)

Code No.
P0136

P.13A-75

Item
No.

Inspection
item

Inspection condition

Normal
condition

Inspection
procedure
No.

Reference
page

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-339

Engine-ECU <M/T> or Engine-CVT-ECU <CVT> Monitor Item

• Items useful for grasping the engine control condition by the engine-ECU <M/T> or engine-CVT-ECU

<CVT> are provided in this monitor item section.

• Values of these monitor items vary greatly depending on marginal difference of measurement conditions,

difference of the environment, aged deterioration of vehicles and so on, and it is difficult to show the pre-
cise specification values. Therefore, check conditions, display range and movement of values are
described.

Item
No.

Inspection
item

Explanation of M.U.T. display

Guideline for inspection

Display range,
numerical
value

5A

Air-fuel ratio
learning
value of B
zone (Low
speed load)

• Shows compensation value that

corrects air-fuel ratio feedback
control under mid-to-high load

• Minus side shows that injection

amount decreases and plus side
shows that it increases

Engine: After warm-up, drive
at 40 km/h

−25 to 25%

5B

Idle speed
control
position
learned
value

• Shows compensation value that

corrects idle speed control
opening (throttle valve opening)

• Minus side shows closed side and

plus side shows open side

Ignition switch: ON

−128 to
127STEP

5C

Idle speed
control
position
learned
value (A/C
load)

• Shows compensation value that

corrects idle speed control
opening (throttle valve opening)
when A/C is ON

• Minus side shows closed side and

plus side shows open side

Ignition switch: ON

−128 to
127STEP

6A

Knock
retard

• Shows retard amount of ignition

timing controlled by detonation
sensor output

Engine: Sudden acceleration
after warm-up

Retards in
response to
accelerator
opening

6B

Learned
knock retard

• Shows compensation value that

corrects ignition timing from
detonation sensor output

• 0% side shows retard and 100%

side shows advance

Ignition switch: ON

0

− 100%

6C

Target idle
speed

• Shows target idle speed

Engine: Idle operation

Changes in
response to
engine coolant
temperature

9B

Air-fuel ratio
learning
value of A
zone (Low
load)

• Shows compensation value that

corrects air-fuel ratio feedback
control under light load

• Minus side shows that injection

amount decreases and plus side
shows that it increases

Engine: After warm-up, 2,500
r/min without any load

−25 to 25%

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-340

NOTE: *: This item is not displayed when the data list in check mode is selected.

9D

Air-fuel ratio
feedback
integration

• Shows feedback amount of

air-fuel ratio

• Minus side shows that injection

amount decreases and plus side
shows that it increases

Engine: After warm-up, 2,500
r/min without any load

−25 to 25%

B2

Alternator G
terminal
duty

• Shows duty ratio to alternator G

terminal

• Engine: After warm-up

• Headlamp switch: When

electrical load increases
such as from OFF to ON

Increases

B3

Purge
control
solenoid
valve duty

• Shows duty ratio to purge control

solenoid valve

Engine: After warm-up

0

− 100%

81

*

Long-term
fuel
compensati
on

• Shows compensation value that

corrects ait-fuel ratio feedback
control under mid-to-high load

• Minus side shows that injection

amount decreases and plus side
shows that it increases

Engine: After warm-up, 2,500
r/min without any load
(Air-fuel ratio feedback
control)

−25 to 25%

82

*

Short-term
fuel
compensati
on

• Shows feedback amount of

air-fuel ratio

• Minus side shows that injection

amount decreases and plus side
shows that it increases

Engine: After warm-up, 2,500
r/min without any load
(Air-fuel ratio feedback
control)

−25 to 25%

87

*

Calculation
load value

• Shows magnitude of engine load

Engine: After warm-up

0

− 100%

88

*

Fuel control
condition

• Shows air-fuel ratio feedback

control status
OL: Open loop, CL: Closed loop
OL-DRV: OL depending on driving
condition
OL-SYS: OL due to system failure
CL-HO2: CL only for front oxygen
sensor (rear oxygen abnormal)

Engine: After warm-up

Changes
depending on
driving condition

Item
No.

Inspection
item

Explanation of M.U.T. display

Guideline for inspection

Display range,
numerical
value

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-341

Actuator Test Reference Table

M1131152501636

Item
No.

Inspection
item

Drive content

Inspection conditions

Normal
condition

Code No.
/Inspection
procedure
No.

Reference
page

01

Injector

Cut off No. 1
injector

Engine: After warm-up,
idle operation (Cut off
injectors sequentially to
check for a cylinder that
does not change engine
in idle status.

Engine is
changed
(becomes
unstable or
stalled)

Code No.
P0201

P.13A-89

02

Cut off No. 2
injector

Code No.
P0202

P.13A-94

03

Cut off No. 3
injector

Code No.
P0203

P.13A-99

04

Cut off No. 4
injector

Code No.
P0204

P.13A-104

07

Fuel pump

Drive fuel pump
to circulate fuel

Ignition
switch: ON

Check for
pump
operating
noise near
fuel tank

Operating
noise audible

Procedure
No. 24

P.13A-289

08

Purge
control
solenoid
valve

Switch solenoid
valve from OFF
to ON

Ignition switch: ON

When the
valve is
actuated,
operating
noise is
audible

Procedure
No. 29

P.13A-325

17

Basic
ignition
timing

Switch
engine-ECU
<M/T> or
engine-CVT-EC
U <CVT> to
ignition timing
adjusting mode

• Engine: Idle

operation

• Install timing light

5

° BTDC

−

−

20

Cooling fan
motor

Fan motor is
driven

Ignition switch: ON

Fan motor
rotates

Procedure
No. 25

P.13A-302

34

Throttle
valve control
servo

Stop the throttle
valve control
servo

Ignition switch: ON

Throttle valve
is opened
slightly

Code No.
P0638

P.13A-173

Main

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