Engine Management Systems - Denso-am.eu

Engine Management SystemsIgnition CoilsGBInstallation and fault-findingRemoval and installationAlways disconnect the cable from negative (-) batteryterminal before replacement and wait at least 90seconds after disconnecting the cable to preventany type of activation. After replacement, connect thecable to negative (-) battery terminal.1. Disconnect the connector from the faulty Ignition Coil. Remove thescrew(s) and faulty Ignition Coil2. Install the new Ignition Coil into the plug hole of the cylinder headin the same orientation with the original sensor, in order to securethe connection to the spark plug terminal. Install the screw andconnector. Turn the engine on and check if the ignition systemworks properly3. Pay extra attention when connecting the Ignition Coil tothe spark plug. Misalignment can cause severe sparkplug damageFault-findingPossible failures> Ignition coils can fail before their usual service life due to wearand defects such as overheating caused by internal short circuits,defective ignition cables, low battery power, vibration, thermalfailures, mechanical damage and incorrect contactsSymptoms> No combustion: No combustion occurs because no spark isemitted> Stalling: Engine stalls but can be restarted> Poor drivability: Hesitation during acceleration or the enginemisfiresPrevention and solutions> The Diagnostic Trouble Code (DTC) engine warning light willprobably be turned on, indicating an ignition error – however, thismight be caused by another system problem. A visual check shouldtherefore be performed first. Check for any mechanical damage,such as cracks and carbon tracks on the Ignition Coil body, anycorroded or worn plugs and cables in the wiring, any loss in batterypower to the ignition system, and any oil or water contamination> If an ignition coil is identified as defective, the root cause shouldbe determined with care, to avoid the replacement Ignition Coilfailing just like the original Ignition Coil. The vehicle manufacturer’signition system instructions should always be referred to in the firstinstance13