DTC P0300: Random Misfire and Any Combination of the Following:; DTC P0301: No. 1 Cylinder Misfire Detected; DTC P0302: No. 2 Cylinder Misfire Detected; DTC P0303: No. 3 Cylinder Misfire Detected; DTC P0304: No. 4 Cylinder Misfire Detected
NOTE:
- If the misfiring is frequent enough to trigger detection of increased emissions during two consecutive driving cycles, the MIL will come on, and DTC P0300 (and some combination of P0301 through P0304) will be stored.
- If the misfiring is frequent enough to damage the catalyst, the MIL will blink whenever the misfiring occurs, and DTC P0300 (and some combination of P0301 through P0304) will be stored. When the misfiring stops, the MIL will remain on.
- Before you troubleshoot, record all freeze data and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION
- Troubleshoot the following DTCs first if any of them were stored along with the random misfire DTC(s):
P0107, P0108, P1128, P1129: Manifold absolute pressure (MAP) sensor
P0131, P0132: Primary heated oxygen sensor (primary HO2S) (Sensor 1)
P0171, P0172: Fuel metering
P0335, P0336: Crankshaft position (CKP) sensor
P0505 (P0506, P0507)*: Idle control system
P1259 (P2646, P2647)*: VTEC system
P1361, P1362, P1366, P1367 (P0340, P0344, P0365, P0369)*: Camshaft position (CMP) sensor (top dead center (TDC) Sensor) A/B
P0511*: Idle air control (IAC) valve
*: 2004-2005 models
- Test-drive the vehicle to verify the symptom.
- Find the symptom in the chart, and do the related procedures in the order listed until you find the cause.SYMPTOM PROCEDURE CHART
Symptom Procedure(s) Also check for: Random misfire only at low RPM and load Check fuel pressure (see FUEL PRESSURE RELIEVING ). - Low compression.
- Low quality fuel.
Random misfire only during acceleration Check fuel pressure (see FUEL PRESSURE RELIEVING ). Malfunction in the VTEC system (see VTEC ROCKER ARM TEST ). Random misfire at high RPM and load, or under random conditions Check fuel pressure (see FUEL PRESSURE RELIEVING ). Correct valve clearance (see VALVE CLEARANCE ADJUSTMENT ).