A diesel engine does not need an ignition system because the high compression ratio heats the air so much that ignition occurs automatically after fuel injection.
Ford Mondeo petrol engines are equipped with an electronic ignition system with regulation of technical characteristics, and the functions of a traditional ignition distributor in such a system are performed by electronic elements. The ignition and injection functions are controlled by one control device. Only in cars with an automatic transmission there is a separate ignition control module.
The control device determines the optimal ignition timing based on the technical characteristics stored in its memory. As a result, the ignition system can more easily adapt to different operating conditions, such as different fuel quality. The distribution of ignition voltage to individual cylinders is performed by fixed electronic elements. There is no need to check the ignition timing, since the ignition system does not contain moving elements, and the ignition timing cannot change.
The ignition voltage is generated by two ignition coils located in one housing, which send two ignition sparks at the correctly selected ignition moment with each revolution of the crankshaft. Each ignition coil supplies two cylinders. While the ignition spark ignites the fuel-air mixture in the cylinder in which the compression stroke is at that moment, the second ignition spark is supplied in the exhaust stroke of the corresponding cylinder. The ignition coil housing is attached to the cylinder head. The ignition system is synchronized by signals sent to the control device by two pulse sensors. One pulse sensor is installed on the flywheel, it registers the current number of revolutions and the position of the crankshaft based on the marks on the flywheel disk (cast jumpers). The second sensor measures the position of the camshaft for the intake valves. When working on the electronic ignition system, it is necessary to strictly observe certain points in order to prevent injury to personnel or failure of the ignition system.
The EEC IV ignition and injection module used in the Ford Mondeo is equipped with a fairly extensive self-test program and a memory device that recognizes errors that occur during vehicle operation and stores this information for a certain period of time (more than 40 starts). The module displays more than 30 possible error codes on the indicator, but a control device and extensive control documentation from Ford are required for interrogation. In the event of malfunctions, contact a Ford workshop.
Warning! If you disconnect the battery, all data stored in the error memory and the set technical characteristics, such as the adjustable idle speed, will be erased. After reconnecting the battery, problems may occur (intermittent operation, engine stalls during acceleration, rough running).
After connecting the battery, start the engine and let it idle for three minutes. Once the operating temperature is reached (the coolant temperature indicator is in the middle of the scale), give it some gas, the engine should run for the next two minutes at 1200 rpm. During this process, the module again memorizes the technical characteristics necessary for the engine to operate. After this, it is necessary to drive the car for 8 km at various speeds to complete the "learning" process and achieve normal operation.
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