Mitsubishi Colt Ralliart. Manual - part 754

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-341

NOTE: *1: The airflow sensor output value may be approximately 10% higher when a vehicle is new (dis-
tance driven is less than 500 km).
NOTE: *2: The injector drive time is the time when the power voltage is 11 V and the cranking speed is 250
r/min or less.
NOTE: *3: The injector drive time may be approximately 10% longer when a vehicle is new (distance driven is
less than 500 km).
NOTE: *4: This item is not displayed when the data list in check mode is selected.

Ignition
advance
value

• Engine coolant

temperature: 80

−

°C

• Lamps, electric

cooling fan and all
accessories: OFF

• Transmission:

Neutral

Idle operation (At
approximately 1
minute passes after
the engine starting
sequence is
completed, and
then the engine is in
the steady state.)

− 18 deg

−

2,500 r/min

− 40 deg

Throttle
position
sensor
(throttle
valve
opening)

• Remove the intake

air hose at the
throttle body

• Disconnect the

connector of the
electronic-controlle
d throttle valve

• Connect only

terminals No. 1,
No. 2, No. 3 and
No. 4 between
disconnected
connectors with
the use of the
special tool:
MB991658

• Ignition switch: ON

Fully close the
throttle valve with
your finger

− 12%

Code No.
P0122,
P0123

P.13B-53

P.13B-57

Fully open the
throttle valve with
your finger

− 100%

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.13B-65

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)

Idle operation

0.4 V or less
⇔ 0.6 − 1 V
(altered)

2,500 r/min

Oxygen
sensor
(rear)

Engine: After
warm-up, idle
operation

At excessive
acceleration

200

− 800 mV Code No.

P0136

P.13B-78

Item
No.

Inspection
item

Inspection condition

Normal
condition

Inspection
procedure
No.

Reference
page

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TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-342

Engine-ECU Monitor Item

• Items useful for grasping the engine control condition by the engine-ECU 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

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%

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

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

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

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

− 100%

Target Idle
speed

• Shows target idle speed

Engine: Idle operation

Changes in
response to
engine coolant
temperature

Air-fuel ratio
learning
value of A
zone (Low
speed 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, idle
operation

−25 to 25%

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TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-343

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

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%

Waste gate
solenoid
valve duty

• Shows duty ratio to wastegate

solenoid valve

Engine: After warm-up

− 100%

Alternator G
terminal duty

• Shows duty ratio to alternator G

terminal

Engine: After warm-up

− 100%

Purge
control
solenoid
valve duty

• Shows duty ratio to purge control

solenoid valve

Engine: After warm-up

− 100%

Long-term
fuel
compensatio
n

• 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, 2,500
r/min without any load
(Air-fuel ratio feedback
control)

−25 to 25%

Short-term
fuel
compensatio
n

• 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%

Calculation
load value

• Shows magnitude of engine load

Engine: After warm-up

− 100%

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: Closed loop only for

front oxygen sensor (rear
oxygen sensor abnormal)

<in case of vehicle with rear

oxygen sensor>

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) <4G1>

13B-344

Actuator Test Reference Table

M1131152501670

Item
No.

Inspection
item

Drive content

Inspection conditions

Normal
condition

Inspection
procedure
No.

Reference
page

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.13B-92

Cut off No. 2
injector

Code No.
P0202

P.13B-97

Cut off No. 3
injector

Code No.
P0203

P.13B-102

Cut off No. 4
injector

Code No.
P0204

P.13B-107

Fuel pump

Drive fuel pump
to circulate fuel

• Engine:

Cranking

• Fuel

pump:
Forced
drive

Inspect both
conditions of
the above

Pinch return
hose with
your fingers
and feel
pulsing flow
of fuel with
them

Feel
pulsation

Procedure
No. 22

P.13B-290

Check for
pump
operating
noise near
fuel tank

Operating
noise is
audible

Purge
control
solenoid
valve

Switch solenoid
valve from OFF
to ON

Ignition switch: ON

When the
valve is
actuated,
operating
noise is
audible

Code No.
P0443

P.13B-161

Fuel
pressure
solenoid
valve

Switch solenoid
valve from OFF
to ON

Ignition switch: ON

When the
valve is
actuated,
operating
noise is
audible

Code No.
P0090

P.13B-25

Waste gate
solenoid
valve

Switch solenoid
valve from OFF
to ON

Ignition switch: ON

When the
valve is
actuated,
operating
noise is
audible

Code No.
P0243

P.13B-119

Basic ignition
timing

Switch
engine-ECU to
ignition timing
adjusting mode

• Engine: Idle operation

• Install timing light

° BTDC

−

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