Dodge Caliber | DTC P0302 – Cylinder 2 Misfire Diagnostic

📌 Diagnostic Trouble Code: P0302
🚗 Vehicle: Dodge Caliber
🛠️ Issue: Cylinder 2 Misfire Detected

This video explains the **OEM diagnostic procedure** for **DTC P0302**, triggered when the PCM detects a misfire rate greater than 1% on **cylinder 2** during two consecutive trips. Misfires can cause rough idle, hesitation, poor fuel economy, and even catalytic converter damage.

💡 Common Causes:
- Ignition coil #2 or coil control circuit fault
- Spark plug damage or wear
- Fuel injector #2 malfunction
- Fuel pressure too low or leaks
- Vacuum leaks or air intake restrictions
- Mechanical faults (compression, valve timing, internal engine problems)
- Powertrain Control Module (PCM) failure

🧪 Diagnostic Topics Covered:
- Visual inspection of engine, pulleys, belts, and electrical connectors
- Testing power supply circuits for injector and coil #2
- Spark output testing on cylinder 2
- Spark plug inspection and gap checking
- Fuel pressure testing (spec: 407 KPa ± 34 KPa / 59 psi ± 5 psi)
- Fuel injector leak-down test and actuation
- Circuit testing for injector and coil control wiring
- Comprehensive mechanical checks: vacuum, timing, compression
- PCM and wiring harness integrity testing

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

📋 Covered in this video:
- Step-by-step electrical and mechanical diagnosis
- How to pinpoint ignition, fuel delivery, or mechanical causes
- When to replace spark plugs, coils, injectors, or PCM
- Final PCM verification after repair

⚠️ Tip: Begin with a complete visual inspection before diving into advanced diagnostics — many misfires are caused by simple, visible issues like damaged wires or vacuum leaks!

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