P0321 - IGNITION/DISTRIBUTOR ENGINE SPEED INPUT CIRCUIT RANGE / PERFORMANCE

The Camshaft position sensor or CMP communicates the Powertrain Control Module (PCM) the exact location of the camshaft and the timing of the distributor.

The crankshaft position sensor (CKP) gives the PCM information about the crankshaft position and crankshaft synchronization. This information is used for engine RPM.

If there is an electrical problem in one of the above-mentioned sensor circuits, the DTC code P0321 OBDII is stored and the Check Engine is illuminated. It should be noted that this code is only identified as a fault in the electrical circuit.

• The MIL light comes on.
• Difficulty starting the vehicle.
• Engine exhaust.
• Lack of power.

The establishment of the diagnostic code P0321 OBD2 is because of these reasons:

• Motor Speed Sensor Harness can have problems causing a short in the circuit.
• The poor electrical connection in the Engine Speed Sensor
• The Engine Speed Sensor may be defective.
• The battery charge may be low.

When faced with the fault code P0321 OBDII, follow these steps to correct it:

• Check for Technical Service Bulletins (TSB) for your particular vehicle.
• Locate the Engine Speed Sensor and inspect its connectors and cables. If you find any burn marks or rubbing of these components, make the appropriate repair or replacement if necessary. Also, check the terminals of the connectors, if they have corrosion, you should clean or change them.
• Test the sensor and associated circuits. The tests vary according to the type of sensor. If it has 2 wires, it is a magnetic pickup style sensor, and if it has 3 wires, it is a Hall effect sensor.
• In the case of a magnetic pickup style sensor: disconnect the sensor and connect the two ohmmeter wires to the sensor terminals. Read the resistance of the ohmmeters and compare them to the manufacturer's specifications. Even if it is on the ohmmeter scale, disconnect one wire from the ohmmeter and connect it to good vehicle ground. If there is no infinite resistance, the sensor is shorted internally to ground, repair, or replace it.
• Reconnect the two wires from the DVOM to the sensor terminals and set the meter to read the AC voltage. Then, turn on the motor and read the AC voltage output. Compare the result with the manufacturer's specifications. Change the sensor if they do not match.
• If the sensor is Hall effect: disconnect the harness that goes to the camshaft and the crank position sensor. Then, use a DVOM to test the power supply circuit. If there are not 5 volts, there is a problem with the cables, make the necessary repairs.
• Check for the presence of good ground.
• Change the engine speed sensor.