Mechanics

HONDA ACCORD ENGINE PROBLEM

2003 Honda Accord • 20,000 miles

Random misfire in several cylinders 2, 4, 6, 5 have did coil pack plugs and erg now what to try
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Angeladonnmyersaxmann
April 2, 2013.




What are the codes?

Roy

Several don't remember them all did know one was 903

I need the codes. 903 is not a code.

Roy
AD

OK, not sure if I can get them again in small town parts store don't have a reader and don't trust the car on the hwy

DTC P0300: Random Misfire and Any Combination of the Following: DTC P0301: No. 1 Cylinder Misfire

DTC P0302: No. 2 Cylinder Misfire

DTC P0303: No. 3 Cylinder Misfire

DTC P0304: No. 4 Cylinder Misfire

DTC P0305: No. 5 Cylinder Misfire

DTC P0306: No. 6 Cylinder Misfire

Special Tools Required

Pressure gauge adapter 07NAJ-P07010A
A/T low pressure gauge w/panel 07406-0070300
A/T pressure hose 07406-0020201
A/T pressure hose, 2,210 mm 07MAJ-PY4011A
A/T pressure adapter 07MAJ-PY40120
Oil pressure hose 07ZAJ-S5A0200

NOTE: If the misfire 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 misfire is frequent enough to damage the catalyst, the MIL will blink whenever the misfire occurs, and DTC P0300 (and some combination of P0301 through P0306) will be stored. When the misfire stops, the MIL will remain on.
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
P0171, P0172: Fuel system
P0335, P0339, P0385, P0389: Crankshaft position (CKP) sensor A/B
P0506, P0507: Idle control system
P0340, P0344: Camshaft position (CMP) sensor
P0401, P0404, P0406, P2413: Exhaust Gas Recirculation (EGR) system

Note this freeze data: Engine speed
Vehicle speed
Throttle position
CLV

Clear the DTC with the HDS.
Start the engine with no load (in neutral), then let it idle.
Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS.

Does the screen indicate FAILED?

YES - Go to step 9.

NO - If the screen indicates PASSED, go to step 5. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, wait for several minutes, then recheck.

Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS.

Does CYL1 MISFIRE. CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts?

YES - Go to step 9.

NO - Go to step 6.

Test-drive the vehicle for several minutes in the range of the recorded freeze data.
Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS.

Does the screen indicate FAILED?

YES - Go to step 9.

NO - If the screen indicates PASSED, go to step 8. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 6 and recheck.

Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS.

Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE. And/or CYL6 MISFIRE show misfire counts?

YES - Go to step 9.

NO - Intermittent failure, system is OK at this time.

Turn the ignition switch OFF.
Check the fuel quality.

Is the quality good?

YES - Go to step 11.

NO - Drain the tank, and fill it with a known-good fuel, then go to step 20.

Inspect the spark plugs. If the spark plugs are fouled or worn, replace them.
Test-drive the vehicle for several minutes in the range of the recorded freeze data.
Check the CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE in the DATA LIST for 10 minutes with the HDS.

Does CYL1 MISFIRE, CYL2 MISFIRE, CYL3 MISFIRE, CYL4 MISFIRE, CYL5 MISFIRE, and/or CYL6 MISFIRE show misfire counts?

YES - Go to step 14.

NO - Go to step 20.

Check the fuel pressure.

Is the fuel pressure OK?

YES - Go to step 15.

N0 -

If the pressure is too high, replace the fuel pressure regulator, then go to step 20.
If the pressure is too low, check the fuel pump, the fuel feed pipe, and the fuel filter. If they are OK, replace the fuel pressure regulator, then go to step 20.

Turn the ignition switch OFF.

Remove the VTEC oil pressure switch (A), and install the special tools as shown, then install the VTEC oil pressure switch (A) in the pressure gauge adapter (B).

NOTE: Install the switch in the reverse order of removal with a new O-ring.

Reconnect the VTEC oil pressure switch 2P connector.
Start the engine. Hold the engine at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on.
Check the oil pressure at engine speeds of 1,000 and 2,000 rpm. Keep the measuring time as short as possible (less than 1 minute ) because the engine is running with no load.

Is the oil pressure below 49 kPa (0.5 kgf/sq. Cm, 7 psi)?

YES - Check for air in the fuel line, then go to step 20.

NO - Inspect the VTEC system, then go to step 20.

Turn the ignition switch ON (II).
Reset the ECM/PCM with the HDS.
Clear the CKP pattern with the HDS. See: Powertrain Management Computers and Control Systems Engine Control Module Testing and Inspection Programming and Relearning
Do the ECM/PCM idle learn procedure. See: Powertrain Management Computers and Control Systems Engine Control Module Testing and Inspection Programming and Relearning
Do the CKP pattern learn procedure. See: Powertrain Management Computers and Control Systems Engine Control Module Testing and Inspection Programming and Relearning
Test-drive the vehicle for several minutes in the range of the recorded freeze data.
Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES - If DTC P0301, P0302, P0303, P0304, P0305, or P0306 are indicated, check for poor connections or loose terminals at the ignition coil, the injector, and the PCM, then go to troubleshooting DTC P0301, P0302, P0303, P0304, P0305 or P0306. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

NO - Go to step 27.

Monitor the OBD STATUS for DTC P0301, P0302, P0303, P0304, P0305, or P0306 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - Troubleshooting is complete.

NO - If the screen indicates FAILED, go to step 1 and recheck. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step 25 and recheck.


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