Mitsubishi FUEL User Manual

MPI <4G6> -
Troubleshooting
13A-31
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
Probable cause
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).
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
Check the harness wire between the
ignition coil and the engine-ECU
<M/T> or engine-A/T-ECU <A/T>.
NG
Replace
NG
Repair
(2) NG
OK
Check the ignition failure sensor
(Refer to GROUP 16 - Ignition
System.)
OK
Check the harness wire between the
ignition coil and the earth, and repair
if necessary.
(3) NG
OK
Measure at ignition coil connectors
B-01, B-11.
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
(1) NG
Check the following connectors:
B-105, C-92, C-105, C-131
NG
Repair
Check the ignition coil (Refer to
GROUP 16 - Ignition System.)
Check the compression pressure.
(Refer to GROUP 11A - On-vehicle
Service.)
Repair
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
OK
Check the harness wire between the
ignition coil and the ignition failure
sensor, and between the ignition
switch and the ignition failure sensor.
NG
Repair
OK
NG
NG
Repair
OK
Replace
NG
Check the spark plugs.
Check the trouble symptoms.
OK
Check the trouble symptoms.
NG
Replace the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
Check the following connectors:
B-01, B-11
Check the following connector:
C-34 <M/T>, C-177 <A/T>
OK

Mitsubishi FUEL Specifications

General

Brand	Mitsubishi
Model	FUEL
Category	Automobile Accessories
Language	English