Check Engine Lamp

USING A CHECK ENGINE/MALFUNCTION INDICATOR LAMP
Among the on-board diagnostic items, a check engine/malfunction indicator lamp illuminates to notify the driver of the emission control items when a malfunction is detected. However, when an irregular signal returns to normal and the engine control module judges that it has returned to normal, the check engine/malfunction indicator lamp is switched off. Moreover, when the ignition switch is turned OFF, the lamp is switched off. Even if the ignition switch is turned on again, the lamp does not illuminates until the malfunction is detected. Here, immediately after the ignition switch is turned on, the check engine/malfunction indicator lamp is lit for 5 seconds to indicate that the check engine/malfunction indicator lamp operates normally

ITEMS INDICATED BY THE CHECK ENGINE/MALFUNCTION INDICATOR LAMP
Powertrain control module (PCM) malfunction
Volume air flow circuit malfunction
Barometric pressure circuit malfunction
Intake air temperature circuit malfunction
Engine coolant temperature circuit malfunction
Throttle position circuit malfunction
Excessive time to enter closed loop fuel control
O2 sensor circuit malfunction (bank 1 sensor 1)
O2 sensor heater circuit malfunction (bank 1 sensor 1)
O2 sensor circuit malfunction (bank 1 sensor 2)
O2 sensor heater circuit malfunction (bank 1 sensor 2)
Fuel trim malfunction (bank 1)
Injector circuit malfunction - cylinder 1
Injector circuit malfunction - cylinder 2
Injector circuit malfunction - cylinder 3
Injector circuit malfunction-cylinder 4
Random misfire detected*
Cylinder 1 misfire detected*
Cylinder 2 misfire detected*
Cylinder 3 misfire detected*
Cylinder 4 misfire detected*
Crankshaft position sensor circuit malfunction
Camshaft position sensor circuit malfunction
Exhaust gas recirculation flow malfunction
Catalytic efficiency below threshold (bank 1)
Evaporative emission control system malfunction
Idle control system malfunction
Transmission*


NOTES:

1. After the powertrain control module (PCM) detects a malfunction, the check engine/malfunction indicator lamp illuminates when the engine is next turned on and the same malfunction is re-detected. However, for items marked with an asterisk (*), the check engine/malfunction indicator lamp illuminates on the first detection of the malfunction.

2. After the check engine/malfunction indicator lamp illuminates, it will be switched off under the following conditions.

- When the PCM monitored the powertrain malfunction three times* and detected no malfunction.

* In this case, one time indicates from engine start to stop.

- For misfiring or a fuel trim malfunction, when driving conditions (engine speed, engine coolant temperature, etc.) are similar to those when the malfunction was first recorded.


CAUTION: If the check engine/malfunction indicator lamp illuminates because of a malfunction of the PCM, transmission between the scan tool and the PCM cannot occur. In this case, the diagnostic trouble code cannot be read.