Feedback System

System Diagram:

The Feedback System monitors air/fuel ratio by means of the voltage signal from the oxygen sensor. Various problems in addition to a defective oxygen sensor can cause the ECU to detect a malfunction in this system and set a trouble code. Some of these problems include:

Air leak in vacuum hoses or emission component
Contaminated oxygen sensor
Fuel injection system faulty
Ignition system misfire
Wiring harness open or short circuit
ECU faulty