Monitor Description
WARNING: This page is about a different variant/trim than selected.
When the ignition switch is turned to ON, the ECM turns the shutdown (SDWN) signal on (High) which turns the continuously variable valve lift controller assembly power on. Also, when the ignition switch is off or during fail-safe mode, the shutdown (SDWN) signal is turned off (Low) which turns the continuously variable valve lift controller assembly power off.
The ECM electrically monitors if the shutdown (SDWN) signal is actually turned on/off by the output circuit of the CPU. If the power supply to the continuously variable valve lift controller assembly is not turned on/off according to the shutdown (SDWN) signal, the ECM will illuminate the MIL and store this DTC.