Toyota 2GR-FE Manual page 368

ES–212
DTC
DTC
DTC
DTC
DTC
DTC
ES
DTC
DESCRIPTION
When the engine misfires, high concentrations of hydrocarbons (HC) enter the exhaust gas. Extremely
high HC concentration levels can cause an increase in exhaust emission levels. High concentrations of
HC can also cause increases in the Three-Way Catalytic Converter (TWC) temperature, which may cause
damage to the TWC. To prevent this increase in emissions and to limit the possibility of thermal damage,
the ECM monitors the misfire rate. When the temperature of the TWC reaches the point of thermal
degradation, the ECM blinks the MIL. To monitor misfires, the ECM uses both the Camshaft Position
(CMP) sensor and the Crankshaft Position (CKP) sensor. The CMP sensor is used to identify any
misfiring cylinders and the CKP sensor is used to measure variations in the crankshaft rotation speed.
Misfires are counted when the crankshaft rotation speed variations exceed predetermined thresholds.
If the misfire exceeds the threshold levels and may cause emission deterioration, the ECM illuminates the
MIL and sets a DTC.
DTC No.
Simultaneous misfiring of several cylinder detected
P0300
(2 trip detection logic)
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
P0300 Random / Multiple Cylinder Misfire Detected
P0301 Cylinder 1 Misfire Detected
P0302 Cylinder 2 Misfire Detected
P0303 Cylinder 3 Misfire Detected
P0304 Cylinder 4 Misfire Detected
P0305 Cylinder 5 Misfire Detected
P0306 Cylinder 6 Misfire Detected
DTC Detection Condition Trouble Area
• Open or short in engine wire harness
• Connector connection
• Vacuum hose connections
• Ignition system
• Injector
• Fuel pressure
• Mass Air Flow (MAF) meter
• Engine Coolant Temperature (ECT) sensor
• Compression pressure
• Valve clearance
• Valve timing
• PCV valve and hose
• PCV hose connections
• Air induction system
• ECM