Mitsubishi FUEL Manual page 129

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
Code No. P0305 No. 5 cylinder misfire detected
Code No. P0306 No. 6 cylinder misfire detected
Range of Check
D The engine speed is 500 - 3,500 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 injector (Refer to P.13A-197*.)
Check the following connectors:
B-02, B-05, B-40, B-03, B-36, B-44, B-43
Check the harness wire between the engine-ECU and the injector
connector.
Check the following items.
D Check the spark plugs, spark plug cables.
D Check the compression pressure.
NOTE:
*: Refer to the '97 GALANT Workshop Manual (Pub. No. PWDE9611)
MPI <6A1> -
OK
OK
OK
Troubleshooting
Probable cause
D Malfunction of the ignition system
D Abnormal compression
D Malfunction of injector
D Malfunction of engine-ECU
NG
Replace
NG
Repair
NG
Repair
13A-129