The OBDII code P1320 on an Infiniti indicates a problem with the ignition system, specifically the primary circuit for cylinder number 6. This code can lead to engine misfires, rough running, and potentially even prevent the engine from starting. Understanding this code and its potential causes is crucial for effective troubleshooting and repair.
Understanding Infiniti OBDII Code P1320
The P1320 code specifically points to an issue with the ignition coil primary circuit for cylinder 6. This circuit is responsible for providing the initial electrical energy to the ignition coil, which then generates the high voltage spark needed to ignite the air-fuel mixture in the cylinder. A fault in this circuit can disrupt the spark generation process, leading to performance problems. This code is often associated with a faulty ignition coil, a wiring problem in the primary circuit, or potentially even an issue with the Engine Control Module (ECM).
Common Causes of P1320 in Infiniti Vehicles
Several factors can contribute to the P1320 code appearing in your Infiniti. Some of the most common causes include:
- Faulty Ignition Coil: A malfunctioning ignition coil for cylinder 6 is the most likely culprit. This can be due to internal damage, wear and tear, or exposure to excessive heat.
- Wiring Issues: Damaged or corroded wiring in the primary circuit can disrupt the electrical signal to the ignition coil, triggering the P1320 code. This can include broken wires, loose connections, or damaged connectors.
- Bad Ground Connection: A poor ground connection for the ignition coil can also cause this code. Ensure the ground wire is securely attached and free of corrosion.
- ECM Problems: While less common, a faulty ECM can sometimes cause the P1320 code. This is usually a last resort diagnosis after other potential causes have been ruled out.
- Crankshaft or Camshaft Sensor Issues: Problems with these sensors can disrupt the timing of the ignition system and lead to misfires, potentially triggering the P1320 code.
- Faulty Spark Plugs or Wires: While less directly related to the P1320 code, worn spark plugs or damaged spark plug wires can contribute to misfires and may exacerbate underlying ignition system problems.
Diagnosing and Fixing the P1320 Code
Troubleshooting the P1320 code requires a systematic approach. Here’s a suggested procedure:
- Visual Inspection: Start by visually inspecting the wiring and connectors associated with the ignition coil for cylinder 6. Look for any obvious signs of damage, corrosion, or loose connections.
- Coil Swap Test: Swap the ignition coil for cylinder 6 with another coil. If the code moves to the new cylinder, the problem is with the coil itself. If the code remains on cylinder 6, the issue lies elsewhere in the circuit.
- Wiring and Connector Tests: Use a multimeter to check the continuity and resistance of the wiring in the primary circuit. Inspect connectors for damage or corrosion.
- Ground Connection Test: Verify that the ignition coil has a good ground connection.
- Sensor Checks: If the problem persists, test the crankshaft and camshaft sensors to ensure they are functioning correctly.
- ECM Testing: If all other checks fail to identify the problem, the ECM may need to be tested by a qualified technician.
Conclusion
The Infiniti OBDII code P1320 signifies a problem within the ignition system, specifically the primary circuit for cylinder 6. Addressing this issue promptly is crucial to prevent further engine damage and ensure optimal vehicle performance. By following a systematic diagnostic approach, you can pinpoint the root cause of the problem and implement the necessary repairs. If you are unsure about any of these steps, consult a qualified Infiniti technician for assistance.
