Note EFI engine use and maintenance

EFI engine computer control system is more complex, and are very sensitive to the high-voltage and high-temperature use should pay attention to the following points: 1, regardless of whether the engine is in operation, as long as the ignition switch is turned, and never can be disconnected working 12V electrical device. Because in these devices is disconnected, since any of the self-inductance of a coil effect, will produce a high instantaneous voltage, there may be more than 7000V, serious damage to the microcomputer and sensors. The following is a part of the electrical device can not be disconnected: any cable of the battery, the gas mixture control solenoid valve and idle speed control device (stepping motor), the electronic fuel injector, secondary air injection solenoid valve (pump solenoid valve), an ignition means leads, the microcomputer PROM (can be programmed, read-only memory), any wire microcomputer, a blower such as the wire connector and the air conditioning clutch wire 

Jumper starter other vehicles or jump start the car with the other vehicle must disconnect the ignition switch, can disassembly jumper battery cables. Electric horn can not be installed near the microcomputer, because the magnetic field of the magnet in the speaker will damage the circuit components in the computer.Arc welding is used in the body of the vehicle, first disconnect the computer power. Should be particularly careful in place near the computer or sensor body repair job.Disassembly PROM, the operator should make their own the ground (contact body), otherwise, the static electricity from your body may damage the computer circuit. 6, such as wiper leaks should be repaired as soon as possible, so as not to be mounted on the front of the cabin under the siding on the microcomputer damp damage. 7, in addition to the specified otherwise in the test program, can not be tested with a pointer-type ohmic microcomputer and sensor may be used a high impedance meter for testing. 

8, do not use a test light to test any electrical device attached to the microcomputer. To prevent damage to the computer and sensor, unless otherwise noted, should have impedance digital test instrument. 9, the human body electrostatic discharge voltage may reach 10000V. Computer manipulation of digital instrumentation maintenance jobs, or close to this instrument, we must bring the pick-ferrous metal band the First Touchan the wrist and the other head fixed in the fuselage.10, the polarity of the battery can not be reversed, in case the the EFI computer suffered damage. 11, "0" ring seal on the injector disposable parts, and can not be reused after dismantling the injector replaced to ensure a good seal.  

12, the failure of the electronic control system is less. The common failure is often caused by poor wiring, so to ensure clear and reliable contact of each connector, terminal. EFI computer is a high-quality parts, less fault itself, need to check the use of special instruments, generally does not permit the overhaul.