Honda 2004 Odyssey Service Manual page 442

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
DTC P0305: No. 5 Cylinder Misfire Detected
DTC P0306: No. 6 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 P0306) 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 P0306) will be stored. When the misfiring stops, the MIL will remain
on.
1. 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)
P0171, P0172: Fuel System
P0335, P0336: Crankshaft Position (CKP) Sensor
P0340, P0341, P0365, P0366: Camshaft Position (CMP) Sensor A/B ('03-04 models)
P0401, P1491, P1498: Exhaust Gas Recirculation (EGR) System
P0505: Idle Control System
P1259: VTEC System
P1361, P1362, P1366, P1367: Top Dead Center (TDC) 1/Top Dead Center (TDC) 2 Sensor ('99-02 models)
P1519: Idle Air Control (IAC) Valve
2. Test-drive the vehicle to verify the symptom.
3. Find the symptom in the chart below, and do the related procedures in the order listed until you find the cause.
Symptom
Random misfire only
at low RPM and
under load
Random misfire only
during acceleration
Random misfire at
high RPM and load,
or under random
conditions
Procedure(s)
Check fuel pressure (see page 11-216).
Check fuel pressure (see page 11-216).
Check fuel pressure (see page 11-216).
Also check for:
• Low compression.
• Low quality fuel.
• Correct EGR valve
function.
Malfunction in the
VTEC system (see
page 6-12).
Correct valve
clearance (see page
6-15).
11-133