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Home >> Acura >> 2000 >> 3.2TL >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0301, P0302, P0303, P0304, P0305, Or P0306: Misfire In One Cylinder

DTC P0301, P0302, P0303, P0304, P0305, Or P0306: Misfire In One Cylinder

NOTE: If misfire is random, see DTC P0300 SET WITH DTC P0301, P0302, P0303, P0304, P0305, OR P0306: RANDOM MISFIRE .
NOTE: If DTCs P0131, P0132, P0171, P0172, P0401, P1361, P1362, P1366 and/or P1367 is set, trouble shoot those DTCs before trouble shooting random misfire DTCs.
  1. Start engine and listen for clicking sound at fuel injector in suspect cylinder. If injector clicks, go to next step. If injector does not click, check for open or short in harness between suspect fuel injector and PCM. See WIRING DIAGRAMS article. If wiring is okay, replace fuel injector, and recheck. If symptom or DTC is gone, replace original fuel injector. If DTC resets, substitute a known-good PCM and recheck. If symptom or DTC is gone, replace original PCM.
  2. Check freeze frame data. Perform PCM reset procedure and clear freeze frame data (if present) and DTC(s). See PCM RESET PROCEDURE/CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Exchange spark plug from suspect cylinder with one from another cylinder. Connect scan tool. Test drive vehicle several times in freeze frame data range. If there is no freeze frame data of misfiring, test drive vehicle under various conditions and try to duplicate malfunction. If DTCs P0301, P0302, P0303, P0304, P0305, P0306 or temporary DTC P1399 are set, go to next step. If DTCs P0301, P0302, P0303, P0304, P0305, P0306 or temporary DTC P1399 are not set, problem is intermittent, possibly due to fouling spark plug. Misfire is not detected at this time. If misfire follows spark plug to different cylinder, replace spark plug. If misfire remains in same cylinder, go to next step.
  3. Exchange fuel injector from suspect cylinder with one from another cylinder. Let engine idle for 2 minutes. Test drive vehicle several times in freeze frame data range. If there is no freeze frame data of misfiring, test drive vehicle under various conditions and try to duplicate malfunction.
  4. If DTC P0301, P0302, P0303, P0304, P0305 or P0306 is not indicated, misfire condition is not detected at this time. Possible intermittent fuel injector poor connection. If misfire follows injector to another cylinder, replace faulty fuel injector. If misfire remains in same cylinder check valve adjustment, cylinder leak down, engine compression and Crankshaft Position (CKP) sensor. Repair as necessary.
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