DTC P0606 ECM / PCM Processor: Description

WARNING: This page is about a different car, the 2007 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

The ECM continuously monitors its internal processors (CPUs), A/F sensor transistors and heated oxygen sensor (HO2S) transistors. This self-check ensures that the ECM is functioning properly. These are diagnosed by internal "mirroring" of the main and sub CPUs to detect the processors error. If outputs from the processors deviate from the standards, the ECM will illuminate the MIL and set a DTC immediately.

DTC DETECTION CONDITION

DTC	DTC Setting Condition	Trouble Area
P0606	ECM CPUs malfunction A/F sensor transistors malfunction HO2S transistors malfunction (1-trip detection logic)	Exhaust gas leak HO2 sensor ECM