Monitor Description

The ECM continuously monitors its internal processors (CPUs), air fuel ratio sensor transistors and heated oxygen sensor transistors built into the ECM. This self-check ensures that the ECM is functioning properly. If outputs from the processors deviate from the standards, the ECM will illuminate the MIL and set the DTC immediately.

DTC DETECTION CONDITION CHART

DTC No.	DTC Detection Condition	Trouble Area
P0607	When one of following conditions is met: Air fuel ratio sensor transistors built into ECM malfunctions Heated oxygen sensor transistors built into ECM malfunctions	Exhaust gas leak Heated oxygen sensor ECM

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