P0203 Code - Injector Circuit Malfunction Cylinder 3

What Does p0203 Mean?

OBD-II Code P0203 is defined as a Injector Circuit/Open - Cylinder 3

The engine control module (PCM) has special transistors called "drivers" to turn the Fuel Injectors on and off in the Fuel Injection System. If the PCM cannot control the fuel injector, it will set code P0203.

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What are the common causes of p0203 ?

To sum things up, the common causes for code P0203 are as follows:

• Failed injector
• Fault in the injector circuit
• Problem with the PCM (injector driver)

How do you troubleshoot p0203 ?

You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio.



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