Contents: Precautions ↳ Disconnecting the battery ↳
The ignition system ensures ignition of the fuel-air mixture in each cylinder at the right moment. The ignition system consists of spark plugs, ignition coils, distributor and connecting wires. General control of the system is one of the functions of the engine control module. Consumers are connected to the positive power source by a wire, and to the negative power source - through the car body (ground). This method reduces the number of wires and simplifies installation. Low-maintenance or maintenance-free batteries are installed on cars. The battery is charged from the generator, which is driven by a belt from the crankshaft pulley.
The starter is a DC motor with compound excitation and an electromagnetic traction relay. When starting, the traction relay moves the pinion into engagement with the flywheel ring gear before the starter receives power from the battery. Once the engine is running, the freewheel clutch disconnects the starter armature from the flywheel ring gear.
Precautions
When working on the electrical system, care must be taken not to damage the semiconductor device (diodes and transistors). When working on the electrical system, the following requirements must be met:
- do not disconnect the battery, alternator or any electrical connectors while the engine is running.
- when performing any work, remove the negative terminal from the battery.
- when performing electric welding work on a vehicle, turn off the alternator and control device.
Disconnecting the battery
There are several consumers in the car that cannot be disconnected because the information contained in them can be erased (clock, ECU memory). When disconnecting the battery, the following requirements must be met:
- on vehicles with central locking, remove the key from the ignition and keep it with you, as connecting the battery may cause the central locking to lock the vehicle.
- on vehicles with an ECU engine management system, the information stored in the memory will be erased. This information includes the idle mode, load modes, and previously detected damage to the system. Each time after disconnecting the battery, it is necessary to reprogram the ECU, which requires starting the engine and warming it up to operating temperature. Then increase the speed to 1200 rpm and hold it for 2 minutes. Then drive about 10 km in different driving modes.
Information for this article was taken from the website www.fordbook.ru