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An Overview of the Self Diagnostic System The ECU on all P7 and TCCS engines has a self diagnostic system which constantly monitors most of the electronic control system’s input circuits. if the circuit fault goes away, the check engine light will go off. However, the diagnostic code will remain in the ECU memory even after the ignition switch is turned off. Fault Detection Principles The ECU fault detection system is programmed to accept sensor signal values within a certain range to be normal, and signals outside of that range to be abnormal. The normal signal range used to diagnose most sensor circuits covers the entire operating range of the sensor signal. Limitations of the Self Diagnostic System The self diagnostic system provides an excellent routine to direct the technician to the heart of an electronic control system problem. When the ECU stores a diagnostic code, the code indicates a problem somewhere in the sensor circuit, not necessarily in the sensor itself Further testing is always required to properly diagnose the circuit. Occasionally, diagnostic codes can be set during routine service procedures or by problems outside the electronic control system. Always clear codes and confirm that they reset prior to circuit troubleshooting. Four Systematic Steps In Diagnosis Routine Quick Checks This step in diagnosis includes confirmation of the problem and routine mechanical and electrical engine checks. Inspection of the engine’s mechanical condition (i.e., audible cranking rhythm and visual ignition secondary condition). Procedures to Retrieve Trouble Codes.
Tags : fault detection system, ecu stores, electronic control system, sensor circuits, input circuits, system diagnosis, toyota engine, signal values, diagnostic system, diagnostic code, sensor signal, sensor circuit, signal range, routine service, mechanical condition
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