![]() IGBT (or "dumb") coils usually have only 2 connections per coil channel as they are simply a coil of wire within. When the ECU wants the coil to fire, it connects it to ground, allowing energy to flow through the coil, and then, and the right time, it breaks this connection causing the coil to fire. The ECU provides a connection to earth, with the other side of the coil being connected to a fused ignition supply. They typically flow several amps, and as a result require an IGBT (high current ground switch) to drive them, as fitted to our ME442 and ME221 wire-in ECUs. IGBT (sometime called dumb/passive coils) are simply a wire wound transformer. TTL coils usually have three or more connections as they have an ignition switched power (12v) a ground and a signal wire at a minimum.įor more information on wiring COPs please see here. That is, 0v on the signal pin and nothing happens, and when 5v is placed onto the signal pin the coil beings to charge, then, when the signal pin goes back to 0v, the coil then fires. Most TTL coils work on a positive or "normal" logic mode. TTL coils usually have an ignition amplifier built in, and expect a simple 5v signal from the ECU to tell them when to dwell (to start charging the coil) and when to fire. The Plug-In range has the correct hardware type (either IGBT or TTL) to suit the OEM ignition system, as well as the correct settings when you load a suitable base map.īoth types are explained here: TTL "Active" Coils & COPS ![]() You need to make sure you use the right kind of output for the coils you choose to use, or vice-versa. The ME ECU range has two types of coil outputs, either Active/TTL (Transistor Transistor Logic) or Passive/IGBT (Insulated Gate Bipolar Transistor). ![]()
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February 2023
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