Code No. P0302: No. 2 Cylinder Misfire Detected

OPERATION

• Check code No. P0264: No. 2 injector circuit low input (Refer to ).
  

FUNCTION

• If a misfire occurs while the engine is running, the engine speed changes for an instant.
  
• The engine-ECU checks for such changes in engine speed.
  

TROUBLE JUDGEMENT

• Engine speed is more than 440 r/min and is less than 4,500 r/min.
  
• Engine coolant temperature is more than -10°C.
  
• Barometric pressure is more than 76 kPa.
  
• Volumetric efficiency is more than 30% and is less than 60%.
  
• Adaptive learning is complete for the vane which generates a crankshaft position signal.
  
• While the engine is running, excluding gear shifting, deceleration, sudden acceleration/deceleration and A/C compressor switching.
  
• The throttle deviation is -0.06 V/10 ms to +0.06 V/10 ms.
  

• Misfire has occurred a predetermined value (2%) or more in the first 1,000 revolutions from engine start-up (corresponding to 1.5 times the limit of emission standard).
  

• After the first 1,000 revolutions, the following criterion is satisfied 4 times cumulatively.
  

• Misfire counts per 1,000 revolutions exceeds a predetermined value (2%) (corresponding to 1.5 times the limit of emission standard)
  

FAIL-SAFE AND BACKUP FUNCTION

• The supply of fuel to the misfiring cylinder can possibly be cut.
  

PROBABLE CAUSES

• Ignition system related part(s) failed
  
• Failed No. 2 injector
  
• Harness damage in No. 2 injector circuit
  
• Low compression pressure
  
• Failed engine-ECU
  

	Go to Step 2.

	Check Inspection Procedure - ignition circuit system (Refer to ).

	Go to Step 3.

	Replace the No. 2 injector.

	Go to Step 4.

	Repair the connector(s) or wiring harness.

	Go to Step 5.

	Repair the connector(s) or wiring harness.

	Go to Step 6.

	Repair.

	Replace the engine-ECU.

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).