====== DTC ====== Example for a diagnostic trouble code (DTC). DTC P0505: Fault in the idle charge control system CONDITION FOR FAULT DETECTION - The PCM cannot control the idle speed during the self-test. Diagnostic information - The malfunction indicator light does not come on. - Therefore, no PRESET CODE is available. - Frame data is not available. - The malfunction code is not stored in the PCM memory. POSSIBLE CAUSE - Drive-by-wire control defective - A/C cut-off control defective - Generator control system defective - Air intake line blocked - Air filter element clogged - Throttle body clogged - Insufficient compression - Engine oil fault - Oil pressure dropped - Malfunction of oil metering pump - Malfunction of oil metering pump control - Engine malfunction - Fuel pressure malfunction - PCM defective