EFI system repair can not solve the problem by changing parts alone

Nineteen years ago, motorcycle repairs could still be considered technical work, but with the development of manufacturing technology and the shift in market demand, motorcycle repairs have changed from being primarily technical repairs to being primarily replacement parts.

 In the early days, motorcycles were luxuries for the people, and the supply of parts was not sufficient, so the main reason for breakdowns was to repair the carburetors, grind the valves, and bore the cylinders, and so on, which was often the case.

After the implementation of the motorcycle emission standards, the EFI system maintenance technology is becoming more and more important, the maintenance master if the EFI system know nothing, even if you want to change the parts are out of the question.

Cite a maintenance case:

 Recently received a customer for help, the vehicle has been used for 2 years, the recent period of time, the vehicle automatically shut off phenomenon occurs from time to time, there is no regularity, the fault has appeared, can only wait for a while, and can start again.Sometimes a day or two may be normal.

 Repair station master asked the customer, when the fault occurs, the vehicle's fault light will be bright, the user said no, either long bright, once the start will go out.(The normal situation is that the fault light is always on before the engine is not started, and it will go out automatically after the engine is running for 2-3 seconds.)

 According to the user's description, this is not a direct reflection of the fault, this type of failure is the most difficult to accurately determine, the customer is asked about the two nearby repair stores said can not be repaired, because there is no diagnostic instrument, it is recommended to come directly to the repair station to repair.

 Encountered such a failure, it is no longer like before, the repairman to change things one by one, can always be repaired.

 First of all, we can analyze, this fault must not be the sensor, because the sensor failure will have a fault light.According to the user's description, the car is not reported fault lights, then it can be inferred that the actuator failure is more likely.

 Repair station master to fault diagnostic instrument into the OBD plug, open the electric door lock, detect a fault code, showing that the injector failure.

 The injector will be cleaned, the plug cleaned, connected, clear the fault code, the fault is not eliminated.

 So, check whether the power supply wiring is loose, because loose may cause a similar failure phenomenon, check the power supply connector, found that the positive pole of a sub-conductor has been crushed.But not completely broken, there are a few copper connected, and has been rusted, resulting in poor contact from time to time, thus generating a fault, the wire connected, the fault disappeared.