DTC Detection Logic

WARNING: This page is about a different car, the 2013 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.

DTC	CONSULT	Diagnostic item is detected when...	Probable malfunction location
C1803	EXHAUST SOLENOID	Driving transistor for the exhaust valve solenoid is OFF and monitor voltage continues at a high level for more than 10 seconds. Driving transistor for the exhaust valve solenoid is ON and monitor voltage continues at a low level for more than 5 seconds.	Open or short circuit in the exhaust valve solenoid control circuit. Refer to "COMPONENT FUNCTION CHECK ".