Mitsubishi FUEL Manual page 240

13I-46
Code No. P0301 No. 1 cylinder misfire detected
Code No. P0302 No. 2 cylinder misfire detected
Code No. P0303 No. 3 cylinder misfire detected
Code No. P0304 No. 4 cylinder misfire detected
Range of Check
D The engine speed is 500 - 4,500 r/min.
D While the engine is running except deceleration and sudden acceleration.
Set Conditions
D The number of misfires exceeds a predetermined number per 200 engine
revolutions (Misfire has occurred in only one cylinder).
or
D The number of misfires exceeds a predetermined number per 100 engine
revolutions (Misfire has occurred in only one cylinder).
Check the following connectors:
B-01, B-11, B-89, B-104
OK
Measure at ignition coil connectors
B-01, B-11, B-89, B-104.
D Disconnect the connector and
measure at the harness side.
(1) The voltage between terminal 1
and earth
(Ignition switch: ON)
OK: System voltage
(2) The voltage between terminal 3
and earth
(Engine: Cranking)
OK: 0.5 - 4.0 V
(3) The resistance between terminal
2 and earth
OK: 2 W or less
OK
Check the ignition coil (Refer to
GROUP 16 - Ignition System.)
Check the spark plugs.
OK
Check the compression pressure.
(Refer to GROUP 11D - On-vehicle
Service.)
OK
Check the trouble symptoms.
NG
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
GDI -
Troubleshooting
NG
Repair
(1) NG
Check the following connectors:
B-01, B-11, B-89, B-104
Check the ignition failure sensor
(Refer to GROUP 16 - Ignition
System.)
Check the harness wire between the
ignition coil and the ignition failure
sensor, and between the ignition
switch and the ignition failure sensor.
(2) NG
Check the following connectors:
C-165 <M/T>, C-177 <A/T>
Check the harness wire between the
ignition coil and the engine-ECU
<M/T> or engine-A/T-ECU <A/T>.
(3) NG
Check the trouble symptoms.
Check the harness wire between the
ignition coil and the earth, and repair
if necessary.
NG
Replace
NG
Repair
Probable cause
D Malfunction of the ignition system
D Abnormal compression
D Malfunction of injector
D Malfunction of engine-ECU <M/T>
D Malfunction of engine-A/T-ECU <A/T>
NG
OK
NG
OK
NG
OK
NG
OK
NG
Repair
Replace
Repair
Repair
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.