P0221 - THROTTLE POSITION SENSOR B CIRCUIT RANGE / PERFORMANCE

System: Combustion
P0221

Description of DTC code P0221 Generic

The TPS (Throttle Position Sensor) calculates the amount of throttle entry. As the throttle opens, the reading in volts increases. This sensor receives 5 volts from the PCM (Powertrain Control Module) corresponding to the reference signal. It also receives a ground.

Normally, during idle the voltage is 0.5, while the maximum acceleration is 4.5 volts. If the PCM finds that the angle of the throttle  is less or greater than necessary for the specific RPM, DTC code P0221 OBDII will be established. This code indicates sector B of the circuit.

Symptoms of fault code P0221 Generic

  • the light of the Check Engine
  • Unstable acceleration.
  • Black smoke expelled by the exhaust.
  • The engine may not start.

Causes of OBD2 P0221 Generic

The factors by which the error code P0221 OBD2 is set are:

  • The TPS Sensor may be short internally.
  • TPS cables may be defective causing a short circuit.
  • Defective Throttle Position Sensor Also, the connector may have water or corrosion.

Possible solutions of the DTC code P0221 Generic

To resolve bugs related to diagnostic code P0221 OBDII you must do the following:

  • With a scanning tool, check the inactive readings of the open throttle with respect to the TPS Compare with the vehicle manufacturer's data. If the result does not match the parameters proceed to change the TPS Sensor.
  • Inspect the TPS connector (Throttle Position Sensor) may have water, repair or replace.
  • Using an oscilloscope check if the TPS Sensor signal is intermittent or short. When doing this test, you should clean up and down without peaks. If not, change the sensor.
  • Check the reference voltage on the TPS Sensor connector. If this voltage is OK, check that the circuit of the ground is not shorted.
  • Signal circuit should not be 12 volts. If so, the circuit is shorted to voltage, repair it.

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