DTC P0607: Control Module Performance: Description

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. 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. This is diagnosed by internal "mirroring" of the main and sub CPUs to detect processor errors If outputs from the processors deviate from the standard, the ECM will illuminate the MIL and set a DTC immediately.

DTC DETECTION CONDITION CHART

DTC No.	DTC Detection Condition	Trouble Area
P0607	When one of following conditions is met ECM CPUs malfunction A/F sensor transistors malfunction HO2S transistors malfunction	Exhaust gas leak HO2S ECM

NOTE: An exhaust gas leak generates noise in the HO2S output. The ECM may interpret this as an HO2S transistor malfunction and set P0607.