Diagnostic guide for P0320

Diagnostic Guide for P0320 - Ignition/Distributor Engine Speed Input Circuit Malfunction

The P0320 code indicates a malfunction in the ignition/distributor engine speed input circuit, which can prevent the engine from starting or cause performance issues. The goal of this diagnostic guide is to systematically identify the root cause of the problem to restore proper engine function.

✓

Difficulty

Intermediate

⏱

Estimated Time

30-60 Minutes

Estimated Diagnostic Cost

$0-$100

Typical shop charge to perform this diagnostic process. Repair parts and labor are not included.

⚙

Tools Needed

OBDII scanner, multimeter, wiring diagram, basic hand tools

Safety Notes

Ensure the vehicle is in park or neutral with the parking brake engaged. Be cautious of moving parts when the engine is running and avoid contact with high voltage components.

Step 1

Check Engine Light and Scan for Codes

Instruction Use an OBDII scanner to check for any stored trouble codes in the Engine Control Module (ECM).

Expected result Confirm the presence of P0320 and any other related codes.

If Pass If P0320 is confirmed, proceed to the next step to inspect the ignition/distributor engine speed sensor.

If Fail If P0320 is not present, investigate other codes that may indicate different issues.

Ask Coddy about this step

Coddy can help with this step only. Tell me what you tested or what result you got.

Step 2

Inspect the Ignition/Distributor Engine Speed Sensor

Instruction Locate the ignition/distributor engine speed sensor and visually inspect it for any signs of damage, corrosion, or loose connections.

Expected result The sensor should be securely connected and free from physical damage.

If Pass If the sensor appears intact, proceed to test the sensor's electrical output.

If Fail If damage or loose connections are found, repair or replace the sensor as necessary.

Ask Coddy about this step

Coddy can help with this step only. Tell me what you tested or what result you got.

Step 3

Test the Ignition/Distributor Engine Speed Sensor Output

Instruction Using a multimeter, measure the voltage output of the ignition/distributor engine speed sensor while cranking the engine.

Expected result The sensor should produce a voltage signal within the manufacturer's specifications.

If Pass If the output is within specifications, check the wiring and connectors for continuity and shorts.

If Fail If the output is outside specifications, the sensor may be faulty and should be replaced.

Ask Coddy about this step

Coddy can help with this step only. Tell me what you tested or what result you got.

Step 4

Inspect Wiring and Connectors

Instruction Examine the wiring harness and connectors associated with the ignition/distributor engine speed sensor for any signs of wear, corrosion, or damage.

Expected result Wiring should be intact without any breaks or shorts, and connectors should be clean and secure.

If Pass If the wiring and connectors are in good condition, proceed to check the crankshaft position sensor.

If Fail Repair any damaged wiring or connectors found during the inspection.

Ask Coddy about this step

Coddy can help with this step only. Tell me what you tested or what result you got.

Step 5

Test the Crankshaft Position Sensor

Instruction Locate and test the crankshaft position sensor using a multimeter to ensure it is functioning correctly.

Expected result The sensor should provide a consistent voltage output when the engine is cranked.

If Pass If the crankshaft position sensor is functioning properly, check the Engine Control Module (ECM) for faults.

If Fail If the sensor is faulty, it may need to be replaced to resolve the P0320 code.

Ask Coddy about this step

Coddy can help with this step only. Tell me what you tested or what result you got.

Step 6

Check the Engine Control Module (ECM)

Instruction If all previous components are functioning correctly, check the ECM for any faults or updates.

Expected result The ECM should not show any faults related to the ignition system.

If Pass If no faults are found, consider reprogramming or replacing the ECM if necessary.

If Fail If faults are detected in the ECM, further diagnostics or replacement may be required.

Ask Coddy about this step

Coddy can help with this step only. Tell me what you tested or what result you got.