P0320 – Ignition/Distributor Engine Speed Input Circuit Malfunction

The ODBII code P0320 indicates a malfunction in the ignition or distributor engine speed input circuit, which affects the engine’s ability to determine the correct speed and timing for ignition.

The severity of ODBII code P0320 is moderate to severe.

Common Causes For: P0320 Ignition/Distributor Engine Speed Input Circuit Malfunction

• Faulty crankshaft position sensor
• Faulty camshaft position sensor
• Damaged wiring or connectors in the ignition/distributor circuit
• Poor electrical connections
• Failed ignition control module
• Malfunctioning engine control module (ECM)
• Timing belt/chain issues
• Faulty distributor (if applicable)

Common misdiagnosis for P0320 Ignition/Distributor Engine Speed Input Circuit Malfunction

• Faulty crankshaft position sensor
• Faulty camshaft position sensor
• Ignition coil issues
• Wiring or connector problems
• Engine control module (ECM) failure
• Timing belt or chain issues
• Fuel system problems
• Bad spark plugs or ignition wires

Common Troubleshooting Steps

The OBD-II code P0320 indicates a malfunction in the ignition or distributor engine speed input circuit. This code typically relates to issues with the crankshaft position sensor (CKP), camshaft position sensor (CMP), or the wiring and connectors associated with these sensors. Here are some common troubleshooting steps to diagnose and resolve the issue:

• Check for Additional Codes: Use an OBD-II scanner to check for any other trouble codes that may be present. Codes related to the crankshaft or camshaft position sensors can provide additional context.
• Inspect Wiring and Connectors: Visually inspect the wiring and connectors associated with the crankshaft and camshaft position sensors. Look for:
• Damaged, frayed, or corroded wires.
• Loose or corroded connectors.
• Signs of wear or heat damage.
• Test the Crankshaft Position Sensor: Use a multimeter to test the crankshaft position sensor for proper resistance and output voltage. Refer to the vehicle’s service manual for specific specifications.
• If the sensor is faulty, replace it.
• Test the Camshaft Position Sensor: Similarly, test the camshaft position sensor if applicable. Check for proper resistance and output voltage.
• Replace the sensor if it is found to be defective.
• Check the Ignition System: Inspect the ignition system components, including spark plugs, ignition coils, and ignition wires. Ensure they are in good condition and functioning properly.
• Inspect the Timing Components: Check the timing belt or chain for proper alignment and wear. A misaligned or damaged timing component can cause issues with the engine speed input.
• Check the Engine Control Module (ECM): Ensure that the ECM is functioning correctly. In rare cases, a faulty ECM can cause issues with sensor readings.
• Check for any software updates or reprogramming that may be needed.
• Perform a Visual Inspection of the Engine: Look for any signs of oil or coolant leaks that could affect sensor operation.
• Ensure that all engine components are securely mounted and not causing interference.
• Clear Codes and Test Drive: After performing repairs or replacements, clear the trouble codes using the OBD-II scanner.
• Take the vehicle for a test drive to see if the code returns.
• Consult a Professional: If the issue persists after performing these steps, it may be necessary to consult a professional mechanic for further diagnosis and repair. By following these troubleshooting steps, you can systematically identify and resolve the issue associated with the P0320 code.