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

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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%

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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

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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

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