Monitor Description

The ECM continuously monitors its internal processors (CPUs) and Heated Oxygen (HO2) sensor transistors built into the ECM. 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 standards, the ECM will illuminate the MIL and set the DTC immediately.

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART

DTC No.	DTC Detection Condition	Trouble Area
P0607	When one of following conditions is met: ECM CPUs malfunction Heated Oxygen (HO2) transistors built into ECM malfunctions	Exhaust gas leak HO2 sensor ECM

NOTE: An exhaust gas leak generates noise in the HO2 sensor output. The ECM may interpret this as an HO2 sensor transistor malfunction and set P0607.