Fig. 7.1. Location of the engine malfunction indicator lamp
If the check engine light remains on while the engine is running, check for a fault code:
However, the indicator lamp should light and remain on for 5 seconds after the ignition is turned on.
Items and conditions that may cause the Malfunction Indicator Lamp (MIL) to come on
| Code | Diagnosed element |
| — | Electronic engine control unit (cars with manual transmission) or electronic engine and automatic transmission control unit (cars with automatic transmission). |
| P0105 | Atmospheric (barometric) pressure sensor and its circuits |
| P0110 | Intake Manifold Air Temperature Sensor and its circuits |
| P0115 | Coolant temperature sensor and its circuits |
| P0120 | Throttle position sensor and its circuits |
| P0125 | Feedback system (for fuel supply) and its circuits |
| P0135 | Front Oxygen Sensor Heating Element (Sensor 1) |
| P0136 | Rear Oxygen Sensor (Sensor 2) and its circuits |
| P0141 | Rear Oxygen Sensor Heating Element (Sensor 2) |
| P0170 | Fuel supply system malfunction |
| P0201 | Injector No.1 and its chain |
| P0202 | Injector #2 and its chain |
| P0203 | Injector #4 and its chain |
| P0300* | Ignition coil (power transistor) and its circuit |
| P0301 | Detection of misfires in cylinder 1 |
| P0302 | Detection of misfire in cylinder 2 |
| P0303 | Detection of misfire in cylinder 3 |
| P0304 | Detection of misfires in the 4th cylinder |
| P0335 | Crankshaft position sensor and its circuits |
| P0340 | Camshaft position sensor and its circuits |
| P0403 | EGR valve and its electrical circuit |
| P0420 | Catalytic converter failure |
| P0443 | Evaporative Evaporative Blowoff Solenoid Valve and its circuits |
| P0505 | Idle Speed Control (ISC) Servo and its Circuits |
Notes
- 1. If the warning lamp lights up due to a malfunction of the engine control unit (vehicles with manual transmission) or the engine and automatic transmission control unit (vehicles with automatic transmission), communication between the MUT-II and the engine control unit (vehicles with manual transmission) or the engine and automatic transmission control unit (vehicles with automatic transmission) is not possible and the diagnostic trouble code cannot be read.
- 2. As soon as the electronic engine control unit (vehicles with manual transmission) or the electronic engine and automatic transmission control unit (vehicles with automatic transmission) has detected a malfunction, the engine malfunction indicator lamp lights up each time the engine is restarted and the same malfunction is indicated again. However, for the position marked with the "*" icon in the table, the indicator lamp lights up only once when the malfunction is detected for the first time.
- The enabled control lwmpf can be disabled only if the following conditions are met:
- (1) When the engine control unit (vehicles with manual transmission) or the engine and automatic transmission control unit (vehicles with automatic transmission) has detected a malfunction in the transmission three* times.
- * in this case, "one time" means the period from engine start to engine stop.
- (2) In the misfire judgment mode, when the vehicle driving conditions (engine speed, coolant temperature, etc.) are similar to the condition under which the malfunction was first detected.
- "Sensor 1" means that the sensor is installed closer to the engine, and "Sensor 2" means that the sensor is installed further from the engine than the first one.
The source of the article is available at mitsubishiman
Fig. 7.2. Functional diagram of the multi-point fuel injection (MPI) system