P0321 Trouble Code Solution
2 Answers
P0321 trouble code solution is as follows: 1. The P0321 trouble code refers to the ignition, distributor engine speed input circuit range and performance. 2. Possible causes of the fault include engine speed sensor failure, sensor damage, circuit connection failure or mismatch, connector failure, crankshaft position sensor signal disc abnormality, etc. 3. The engine speed sensor is the most basic output signal for engine operation. Its working principle is to calculate the engine speed and ignition advance angle, and cooperate with the camshaft position sensor signal to identify the first cylinder ignition top dead center. If the engine speed sensor fails, it will cause the engine to incorrectly calculate the ignition advance angle, resulting in delayed or deviated ignition. 4. The trouble code can be cleared if the sensor is broken, but the trouble code will appear after the car is started several times. After the trouble code appears, ignition difficulty will occur. If no iron filings are found after replacing the sensor, it is necessary to check the circuit, battery failure, or whether the engine has a cylinder misfire. 5. Failure to clear the car trouble code in time will cause the control center computer to lose normal records or the car's normal functions to be unavailable.
Last time my car threw this trouble code, it took me half a day to fix it. P0321 indicates an implausible crankshaft position sensor signal, most commonly caused by the sensor being clogged with iron filings or sludge. I first blasted the sensor probe with carburetor cleaner, but it still didn't work after wiping it clean. Then I used a multimeter to check the wiring continuity and confirmed the wires weren't broken. Finally, I borrowed a mechanic's oscilloscope and saw intermittent waveforms - I gritted my teeth and spent 200 bucks on a new sensor to solve it. These sensors are quite delicate; remember never to hammer them during replacement - you must use a special puller tool. After replacement, it's best to clear the trouble codes and test drive the car - only when there's no jerking during hard acceleration can you consider it properly fixed. Don't forget to check the gap between the sensor and flywheel - signals won't read accurately if it's too far or too close.
