Скачать или смотреть Dodge Caliber | DTC P0304 – Cylinder 4 Misfire Diagnostic

📌 Diagnostic Trouble Code: P0304
🚗 Vehicle: Dodge Caliber
🛠️ Issue: Cylinder 4 Misfire Detected

This video explains the *OEM diagnostic procedure* for *DTC P0304**, which sets when the PCM detects a misfire rate exceeding 1% on **cylinder 4* during two consecutive trips. Cylinder-specific misfires can lead to rough idle, hesitation, increased emissions, and possible catalytic converter damage.

💡 Common Causes:
Ignition Coil #4 or Coil Control Circuit
Spark Plug (cracked, worn, or gapped incorrectly)
Fuel Injector #4 fault or leak-down
Fuel Pump/Regulator issues
Wiring and connector problems (injector, coil circuits)
Air induction or vacuum leaks
Mechanical engine problems (compression, timing, internal wear)
Powertrain Control Module (PCM) failure

🧪 Diagnostic Topics Covered:
Visual inspection for mechanical and electrical issues
Testing the Fused Main Relay output circuits (K343/K344)
Spark output test using a spark tester
Spark plug condition and gap check
Fuel pressure testing (407 KPa ± 34 KPa / 59 psi ± 5 psi)
Injector leak-down and activation tests
Coil and injector control circuit resistance and continuity checks
Mechanical tests: compression, vacuum, valve timing
PCM output testing and harness inspection

🧰 Tools You’ll Need:
OBD2 scan tool
Spark tester
Fuel pressure gauge
Digital multimeter
Basic hand tools

📋 Covered in this video:
Step-by-step electrical and mechanical diagnostic procedure
How to check ignition, fuel, and mechanical causes
When to replace spark plugs, coils, injectors, or PCM
Final PCM verification procedure after repairs

⚠️ Tip: Always begin with a full visual inspection before conducting advanced tests. Many misfire DTCs are caused by simple issues like connector problems or vacuum leaks!

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