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Malfunction: a 2005 sedan flying car (model LHGGD3). The cumulative mileage is 63 thousand km, sometimes the engine can start normal, sometimes the engine can not start, and at this time the shift lever can not change from the P position other gear, the D gear indicator on the dashboard, the anti start indicator lamp and the engine fault indicator light. Inspection and analysis: using HDS to detect engine and CVT system, there is no fault code storage; the system is checked by anti start system, and the system is also normal. When the fault is verified, it is found that when the engine can not start, neither ignition nor fuel injection and gasoline pump do not work, which can be considered as a result of the abnormal work of the anti start system. According to the circuit diagram of the start up system, check the fuse of NO.8 (L5 A) in the fuse box of the engine room (for the instrument and the receiver of the anti start control device). And the NO.11 (15A) fuse under the instrument desk (for ECM power supply). All are normal. The vehicle anti start system is composed of ignition key (with built-in responder), anti start control receiver, anti start control device and ECM. Where is the fault in the end? Decision or first from the anti start indicator light line check it, its current trend is: NO.8 fuse, instrument, anti start indicator lamp, anti start control device receiver, ECM and anti start control device. Press the terminal 7 connector of the anti start control device, connect the ignition switch and measure the line 5 (blue / orange) with a diode test lamp. Electricity, and the anti start indicator light is on. This indicates that the lamp is not abnormal, may be the device control of the lamp, check the red / blue line on the ECM terminal E26, no electricity, and explain the anti start. The control device receiver has no electricity. Considering that the possibility of the failure of the line is very small, it replaces the receiver of the anti start control device without rechecking the input line of the receiver of the anti start control device, and then the test car finds that the engine can be started, but the test is still h to refire the engine again. Starting, the above fault recurs. After resetting the car's remote control several times, the anti start indicator light is found, then the engine can start, and return to the store and check the input line of the anti start control device receiver. When the ignition switch is turned on, the anti start control device ends the 6 line (yellow / blue) on the connector. The anti start indicator light is not bright, the line is supplied by the main relay 1, and the main relay is checked. In the process of dismantling the main relay, it suddenly comes to the sound of its suction. At the same time, the anti start indicator light is found, then the engine can start smoothly, and it appears that the fault is on the main relay. Elimination method: replace the main relay 1.