Code No. P0302: No. 2 Cylinder Misfire Detected

OPERATION

• Check code No. P0264: No. 2 injector circuit low input (Refer to ).
  
• Check code No. P0265: No. 2 injector circuit high 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 500 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 11.3 %.
  
• 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 more frequently than allowed during the last 200 revolutions (when the catalyst temperature is more than 1,000°C).
  

• 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.

	Repair or replace the connector, or replace the No. 2 injector.

	Go to Step 4.

	Repair or replace the connector, or repair the damaged harness wire.

	Go to Step 5.

	Repair or replace the connector, or repair the damaged harness wire.

	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 ).