Toyota Corolla 4A-FE Engine Overview
The Toyota 4A-FE engine was produced from 1987 to 1998. It produces two engine generation, which can be distinguished by their appearance. The first generation were produced from 1987 to 1993. The engine had a gas distribution mechanism DOHC system with 4 valves per cylinder and fuel injection EFI. The external difference is the metal plate on the cover of the valves with the inscription “16 valve EFI” and that included the injector directly into the cylinder head. The second generation was increased profile cams in the cylinder head. Fuel injector enter directly into the intake manifold. valve cover has a horizontal fin around the perimeter. Technically it has been modified pistons, intake valves and intake manifold. The last generation was equipped with MAP sensor. This generation were produced from 1992 to 1998
Toyota Corolla Ignition System
There are three types of ignition system fitted to models covered by this article.
a. Ignition System of 1.6 litre 4A-FE engine – The first type, fitted to the 1.6 litre 4A-FE engine, has a distributor fitted to the left-hand end of the cylinder head, which incorporates the ignition pick-up sensors to monitor the position and speed of the camshaft, and therefore the firing cycle. The engine management ECM uses the information from the sensors to calculate the precise moment to interrupt the current to the primary ignition coil, which causes the secondary ignition coil to generate high voltage which passes down the HT lead to the distributor cap. This is then passed to the correct HT lead by the spinning rotor, and then jumps across the spark plug electrodes, causing a spark which ignites the air/fuel mixture. This type of system, where the ignition coil and igniter is integrated into the distributor, Toyota call their Integrated Ignition Assembly (II A).
b. Ignition System of 1.3 litre 4E-FE engines – The second type, fitted to the 1.3 litre 4E-FE engines, is a distributorless ignition system. Here the crankshaft speed and position is monitored by a sensor fitted adjacent to the crankshaft pulley at the right-hand end of the engine. The engine management ECM calculates the optimum moment to trigger the spark, then interrupts the primary signal to one of the two ignition coils bolted to the lefthand end of the cylinder head. The positive and negative ends of secondary coils are connected to the spark plugs on cylinders 1 and 4, and 2 and 3. When the primary current is interrupted, the secondary coil generates a spark at the two cylinders it’s connected to. However, only one of these sparks occurs at the correct combustion phase and causes ignition, the other spark occurs harmlessly during the exhaust stroke, and is known as a ‘wasted’ spark. A knock sensor is also fitted, to monitor for any signs of pre-ignition. Should any be detected, the ECM will gradually retard the ignition timing until the symptoms disappear.
c. Ignition System of 1.4 litre 4ZZ-FE and 1.6 litre 3ZZ-FE engines – The third type, fitted to the 1.4 litre 4ZZ-FE and 1.6 litre 3ZZ-FE engines, has one ignition coil per cylinder, fitted directly above each spark plug. The engine management ECM information from the crankshaft and camshaft position sensors to calculate the optimum to generate a spark at each cylinder sequentially. A knock sensor is also fitted, to monitor for any signs of pre-ignition. Should any be detected, the ECM will gradually retard the ignition timing until the symptoms disappear.
Toyota Corolla Ignition System Wiring Diagram
The following schematic depicts the Toyota Corolla Ignition System Wiring Diagram.