What are the functions of the three wires in the Excelle ignition coil?
2 Answers
The functions of the three wires in the Excelle ignition coil are: 1. Power supply wire: Provides voltage from the ignition switch and main relay; 2. Ground wire controlled by the engine ECU; 3. Control signal wire is the switching signal output from the ECU computer circuit board, which controls the ignition signal. The independent ignition system does not have high-voltage wires because the coil output is directly connected to the spark plug. The Excelle has a length of 4468mm, width of 1765mm, height of 1469mm, a wheelbase of 2611mm, front track of 1495mm, rear track of 1502mm, and a top speed of 170km/h.
Having worked on cars for years, I've seen plenty of these three ignition coil wires. One is called the power wire, usually labeled BAT, directly connected to the battery's positive terminal to provide a constant 12V supply to the coil. Another is the signal wire, commonly referred to as IGN, coming from the engine control unit (ECU), telling the coil when to fire. Then there's the ground wire, GND, ensuring current can loop back to the battery. These three are indispensable: if the power wire breaks, the coil loses power and the car won't start; if the signal wire fails, incorrect ignition timing causes engine misfires; and a loose ground wire disrupts the circuit, leading to misfires. Common issues include aging wires, corroded connectors, or rodent damage. I often see cars with poor acceleration or starting difficulties, mostly due to these problems. For routine checks, owners should clean the engine bay and address any wire cracks immediately. Maintenance-wise, ignition coils have a limited lifespan and can cause spark plugs to wear out prematurely, increasing fuel consumption. During regular servicing, have a technician use a multimeter to check voltages for early prevention, avoiding breakdowns. Don't overlook these details—safe driving depends on them.
