DTC P0606 ECM / PCM Processor: Description

The ECM (HV control ECU) 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 processors error. If outputs from the processors deviate from the standards, the ECM will illuminate the MIL and set a DTC immediately.

DTC SETTING CONDITION CHART

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

NOTE: First check for an exhaust gas leak around the HO2S if P0606 is present. An exhaust gas leak generates noise in the HO2S output. The ECM (Included in HV control ECU) may interpret this as an HO2S transistor malfunction.