Mitsubishi Lancer Evolution IX. Manual — part 384
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-11
NOTE:
.
•
If the engine warning lamp illuminates because of a malfunction of the engine-ECU, communication
between M.U.T.-II/III and the engine-ECU is impossible. In this case, the diagnosis code cannot be read.
•
After the engine-ECU has detected a malfunction, the engine warning lamp illuminates when the engine is
next turned on and the same malfunction is re-detected. However, for items marked with a "*" in the diag-
nosis code number column, the engine warning lamp illuminates only on the first detection of the malfunc-
tion.
•
After the engine warning lamp illuminates, it will be switched off under the following conditions.
•
When the engine-ECU monitored the power train malfunction three times* met set condition require-
ments, it detected no malfunction.
*: In this case, "one time" indicates from engine start to stop.
•
For misfiring malfunction, when driving conditions (engine speed, engine coolant temperature, etc.)
are similar to those when the malfunction was first recorded.
•
Sensor 1 indicates, the sensor mounted at a position closest to the engine, and sensor 2 indicates the
sensor mounted at the position second closest to the engine.
METHOD OF READING AND ERASING
DIAGNOSIS CODES
Refer to
, GROUP 00
− How to Use Trouble-
shooting/Inspection Service Points.
DIAGNOSIS USING DIAGNOSIS 2 MODE
1. Switch the diagnosis mode of the engine control
unit to DIAGNOSIS 2 mode using the M.U.T.-II/III.
2. Carry out a road test.
3. Take a reading of the diagnosis code and repair
the problem location.
4. Turn the ignition switch to "LOCK" (OFF) position
and then back to "ON" position again.
NOTE: By turning the ignition switch to "LOCK"
(OFF) position, the ENGINE-ECU will switch the
diagnosis mode from DIAGNOSIS 2 mode to
DIAGNOSIS 1 mode.
5. Erase the diagnosis codes.
INSPECTION USING M.U.T.-II/III DATA
LIST AND ACTUATOR TESTING
1. Carry out inspection by means of the data list and
the actuator test function, if there is an
abnormality, check and repair the chassis harness
and components.
2. After repairing, re-check using the M.U.T.-II/III and
check that the abnormal input and output have
returned to normal as a result of the repairs.
3. Erase the diagnosis code memory.
4. Remove the M.U.T.-II/III, and then start the engine
again and carry out a road test to confirm that the
problem has disappeared.
FREEZE FRAME DATA
When the engine-ECU detects a malfunction and
stores a diagnosis code, it also stores a current sta-
tus of the engine. This function is called "Freeze
frame data". By analyzing this "Freeze frame" data
with the M.U.T.-II/III, an effective troubleshooting can
be performed.
The display items of freeze frame data are shown
below.
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-12
DISPLAY ITEM LIST
NOTE: If malfunctions have been detected in multi-
ple systems, store one malfunction only, which has
been detected first.
DRIVE CYCLE
By carrying out the test drive in the following three drive cycle patterns, the all monitoring can be accom-
plished for the diagnosis codes that is required by the vehicle driving to identify the fault. In other words,
doing such a drive allows to regenerate any kind of trouble which involves illuminating the engine warning
lamp (check engine lamp) and to verify the repair procedure has eliminated the trouble [the engine warning
lamp (check engine lamp) is no longer illuminated].
CAUTION
Two technicians should always be in the vehicle when carrying out a test drive.
NOTE: Check that the diagnosis code is not output before traveling in the Drive cycle pattern. Erase the diag-
nosis code if it has been output.
DRIVE CYCLE PATTERN LIST
Item No.
Data
Unit
21
Engine coolant temperature sensor
°C
22
Engine speed
r/min.
24
Vehicle speed
km/h
81
Long-term fuel compensation (long-term fuel trim)
%
82
Short-term fuel compensation (short-term fuel trim)
%
88
Fuel control condition
Open loop
OL
Closed loop
CL
Open loop due to drive condition
OL-DRV.
Open loop due to system malfunction
OL-SYS.
Closed loop based on one oxygen sensor
CL- HO2S
87
Calculation load value
%
−
Diagnosis code during data recording
−
Procedure
Monitor item
Diagnosis code
Catalytic converter monitor
P0421
Oxygen sensor (front) monitor
P0130
Other monitor
P0136, P0201, P0202,
P0203, P0204, P0300,
P0301, P0302, P0303,
P0304, P0325, P0500,
P0551
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-13
Procedure 1
Catalytic converter monitor
Diagnosis
code No.
P0421
Drive cycle
pattern
One trip monitor [from start to ignition switch to "LOCK" (OFF) position] will be completed
while traveling with the following drive cycle pattern. It will take 16 minutes or more.
Inspection
condition
• Atmospheric temperature: −10°C or more
Test
procedure
1. Engine: start
2. Accelerate until the vehicle speed is 90 km/h or more.
3. Travel for 6 minutes or more while keeping the vehicle speed at 90 km/h or more.
4. Decelerate until the vehicle speed is within 80 km/h or less.
5. While traveling at 55
− 80 km/h for 10 minutes or more, fully close the throttle at least
once in 2 minutes and decelerate for 10 seconds or more.
• Do not repeat deceleration too often.
• Vehicle speed may go below 55 km/h after the deceleration.
• Stopping and braking are permitted. (If stopped or drive at 55 km/h or less for more
than 5 minutes the monitoring may be stopped. In this case please restart monitoring
from the beginning.)
6. After completing the above deceleration, bring the vehicle speed back to 55
− 80 km/h
and keep it in the range until starting the deceleration again.
• Repeat the above deceleration at least 5 times.
7. Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position.
AK301815
10 minutes or more
Ignition switch :
"LOCK" (OFF)
position
Engine Start
Vehicle
speed
6 minutes or more
90 km/h or more
55 - 80 km/h
(1)
(5,6)
(4)
(3)
(2)
(7)
Time
Stopping and braking
permitted
AB
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-14
Procedure 2
Oxygen sensor (front) monitor
Diagnosis
code No.
P0130
Drive cycle
pattern
One trip monitor [from start to ignition switch to "LOCK" (OFF) position] will be completed
while traveling with the following drive cycle pattern. It will take 16 minutes or more.
Inspection
conditions
• Engine coolant temperature: After engine warm up
• Atmospheric temperature: −10°C or more
Test
procedure
1. Engine: start
2. Accelerate until the vehicle speed is 55
− 80 km/h.
3. While keeping the accelerator pedal opening degree constant, keep the vehicle speed at
55
− 80km/h and travel for 16 minutes or more.
• Stopping and braking during this operation are permitted.
4. Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position.
AK301816AB
16 minutes or more
Ignition switch :
"LOCK" (OFF)
position
Engine Start
Vehicle
speed
55 - 80 km/h
(1)
(4)
(3)
(2)
Time
Stopping and braking
permitted
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