P0223 Code - Throttle/Petal Position Sensor/Switch 'B' Circuit High Input

What Does P0223 Mean?

OBD II fault code is defined as “Throttle/Pedal Position Sensor/Switch B High Input”, and set when the PCM (Powertrain Control Module) detects a signal voltage from the TPS (Throttle Position Sensor) that does not correlate with the current engine speed.
On most applications, a voltage or resistance deviation of more than 10% of the specified reference value will cause a code to be stored and the CHECK ENGINE light to be illuminated. As a rule, the PCM will recognize a closed throttle as a zero, or close to a zero voltage/resistance value, but be sure to check the actual voltage/resistance for a closed throttle against values stated in the manual.

Essentially, the TPS is a type of variable resistor that is attached to the throttle body, and it alters the throttle opening as the circuit resistance/voltage changes due to movements of the accelerator pedal. The TPS relies on signals from the PCM (derived from the pedal) to actuate the throttle, on the one hand, while at the same time, supplying the PCM with precise information on how wide the throttle is open at any given time.

To complete the circuit, there is another sensor attached to the accelerator. This is most commonly a Hall Effect sensor that generates a current when a moving part is moved through a magnetic field. This signal is used by the PCM to actuate a mechanism (which can be a motor, solenoid, or other device) in the TPS to change the position of the throttle plate.

Changes in the throttle opening serve to alert the PCM to make suitable adjustments to the ignition timing, VVT/VCS timing, and injector pulse width/duration to ensure peak engine performance under any given load.

NOTE: Code P0223 is only relevant to “drive-by-wire” systems in which there are no physical connections, such as throttle cables, between the accelerator pedal and the throttle plate/body. In some applications, there may be additional sensors and devices fitted to act as back-ups should a primary component or sensor fail.

The image below shows a typical Throttle Position Sensor and its location.

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What are the common causes of P0223 ?

• The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
• Defective ECU strategies or components will prevent proper regeneration
• A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

How do you troubleshoot P0223 ?

The original multi-displacement system turned off opposite pairs of cylinders, allowing the engine to have three different configurations and displacements. P0223 code had an elaborate diagnostics procedure, including showing engine trouble codes on the air conditionning display. However, the system was troublesome, misunderstood by customers, and a rash of unpredictable failures led to the technology being quickly retired.



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