DTC Detection Logic

WARNING: This page is about a different car, the 2011 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

DTC DETECTION LOGIC

DTC No.	Trouble diagnosis name (Trouble diagnosis content)	DTC detecting condition	Possible cause
P0643	SENSOR POWER/CIRC (Sensor power supply circuit short)	ECM detects that the voltage of power source for sensor is excessively low or high.	Harness or connectors (Accelerator pedal position sensor 1 circuit is shorted.) [Camshaft position sensor (bank 2) circuit is shorted.] [Manifold absolute pressure (MAP) sensor circuit is shorted.] (Throttle position sensor circuit is shorted.) Accelerator pedal position sensor 1 Camshaft position sensor (bank 2) Manifold absolute pressure (MAP) sensor Throttle position sensor