Mitsubishi FUEL Manual page 5

Code No. Diagnosis item
P0403 EGR valve system
P0420 Catalyst malfunction
P0443 Purge control solenoid valve system
P0505 Idle speed control system
P0510 Idle position switch system
P0551 Power steering fluid pressure switch system
NOTE
1. If the engine warning lamp illuminates because of a malfunction of the engine-ECU <M/T> or
engine-A/T-ECU <A/T>, communication between MUT-II and the engine-ECU <M/T> or engine-A/T-ECU
<A/T> is impossible. In this case, the diagnosis code cannot be read.
2. After the engine-ECU <M/T> or engine-A/T-ECU <A/T> 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 "L" in the diagnosis code number column, the engine warning lamp illuminates
only on the first detection of the malfunction.
3. After the engine warning lamp illuminates, it will be switched off under the following conditions.
(1) When the engine-ECU <M/T> or engine-A/T-ECU <A/T> monitored the power train malfunction
three times* and met set condition requirements, it detected no malfunction.
*: In this case, "one time" indicates from engine start to stop.
(2) For misfiring malfunction, when driving conditions (engine speed, engine coolant temperature,
etc.) are similar to those when the malfunction was first recorded.
4. 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.
MPI <4G6> - MPI <4G6> -
Troubleshooting Troubleshooting
METHOD OF READING AND ERASING DIAGNOSIS
CODES
Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points.
DIAGNOSIS USING DIAGNOSIS 2 MODE
1. Switch the diagnosis mode of the engine control unit
to DIAGNOSIS 2 mode using the MUT-II.
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 OFF and then back to ON
again.
NOTE
By turning the ignition switch to OFF, the ENGINE-ECU
will switch the diagnosis mode from DIAGNOSIS 2 mode
to DIAGNOSIS 1 mode.
5. Erase the diagnosis codes.
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