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 

P.00-5

, 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

1

Catalytic converter monitor

P0421

2

Oxygen sensor (front) monitor

P0130

3

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