What does the U1313 trouble code represent?

[DelLondyn]

Fault code U1313 indicates a malfunction in the camshaft position sensor. The details are as follows: 1. Main function: The Camshaft Position Sensor (CPS) is responsible for collecting the position signal of the camshaft and transmitting it to the ECU. This allows the ECU to identify the top dead center of cylinder 1 for sequential fuel injection control, ignition timing control, and knock control. 2. Name origin: (1) The camshaft position sensor is also known as the Cylinder Identification Sensor (CIS). To distinguish it from the Crankshaft Position Sensor (CPS), the camshaft position sensor is generally referred to as CIS. (2) The camshaft position signal is also used to identify the first ignition timing during engine startup. Since the camshaft position sensor can determine which cylinder piston is about to reach top dead center, it is called the Cylinder Identification Sensor.