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.
44
*4
Ignition
advance
value
• Engine coolant
temperature: 80
−
95
°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.)
2
− 18 deg
−
−
2,500 r/min
20
− 40 deg
8A
*4
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
0
− 12%
Code No.
P0122,
P0123
Fully open the
throttle valve with
your finger
75
− 100%
A1
*4
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
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
A2
*4
Oxygen
sensor
(rear)
Engine: After
warm-up, idle
operation
At excessive
acceleration
200
− 800 mV Code No.
P0136
Item
No.
Inspection
item
Inspection condition
Normal
condition
Inspection
procedure
No.
Reference
page
Main
Index
Group
TOC
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
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
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%
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-343
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%
B1
Waste gate
solenoid
valve duty
• Shows duty ratio to wastegate
solenoid valve
Engine: After warm-up
0
− 100%
B2
Alternator G
terminal duty
• Shows duty ratio to alternator G
terminal
Engine: After warm-up
0
− 100%
B3
Purge
control
solenoid
valve duty
• Shows duty ratio to purge control
solenoid valve
Engine: After warm-up
0
− 100%
81
*
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%
82
*
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%
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: 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
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
02
Cut off No. 2
injector
Code No.
P0202
03
Cut off No. 3
injector
Code No.
P0203
04
Cut off No. 4
injector
Code No.
P0204
07
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
Check for
pump
operating
noise near
fuel tank
Operating
noise is
audible
08
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
09
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
12
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
17
Basic ignition
timing
Switch
engine-ECU to
ignition timing
adjusting mode
• Engine: Idle operation
• Install timing light
5
° BTDC
−
−
Main
Index
Group
TOC
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