Cylinder Misfire - Honda Civic 2002-2003 Service Manual

PGM·FI System
DTe Troubleshooting (cont'd)
OTC P0301: No.1 Cylinder Misfire
OTC P0302: No.2 Cylinder Misfire
OTC P0303: No.3 Cylinder Misfire
OTC P0304: No.4 Cylinder Misfire
1. After checking and recording the freeze data. reset
the ECM (see page 11·4). If there is no freeze data of
the misfire, just clear the DTC.
2. Start the engine, and listen for a clicking sound
from the injector at the problem cylinder.
Does the injector click?
YES-Go to step 3.
NO-Go to step 30.
3. Turn the ignition switch OFF.
4. Exchange the ignition coil from the problem
cylinder with one from another cylinder.
5. Test-drive the vehicle for several minutes in the
range of the freeze data or under various
conditions ifthere was no freeze data.
6. Check for a DTC or a Temporary DTC with the scan
tool.
Is OTe or Temporary OTe P0301, P0302, P0303
or P0304 indicated?
YES-Go to step 7.
NO-Intermittent misfire due to poor contact at the
ignition coil connectors (no misfire at this time).
Make sure the coil connections are secure .•
"·72
7. Determine which cylinder(s) had the misfire.
Does the misfire occur in the cylinder where the
ignition coil was exchanged?
YES-Replace the faulty ignition coil..
NO-Go to step 8.
8. Turn the ignition switch OFF.
9. Exchange the spark plug from the problem cylinder
with
one from
another cylinder.
10. Test·drive the vehicle for several minutes in the
range of the freeze data or under various
conditions
if
there was no freeze data.
11. Check for a DTC or Temporary DTC with the scan
Tool.
Is OTe or Temporary OTe P0301, P0302, P0303
or P0304 indicated?
YES-Go to step 12.
NO-Intermittent misfire due to spark plug fouling,
etc. (no misfire at this time) .•
12. Determine which cylinder(s) had the misfire.
Does the misfire occur in the cylinder where the
spark plug was exchanged?
YES-Replace the faulty spark plug .•
NO-Go to step 13.
13. Turn the ignition switch OFF.
14. Exchange the iniector from the problem cylinder
with one from another cylinder.
15. Let the engine idle for 2 minutes.
•