Direct Ignition System (Dis)

Components for DIS include an ignition cartridge, crankshaft position sensor, pressure sensor, knock detector and wastegate solenoid valve.

The DIS system is a capacitive discharge type. Energy for spark is stored in the capacitor and discharged through the ignition coil. Ignition system uses preprogrammed values stored in the ECU to trigger spark based on signals received from the crankshaft pulley sensor.

When the engine is cranking, the ECU identifies cylinder pairs, to establish firing order, by signals sent from the crankshaft sensor. During difficult start conditions (below 420 RPM), a rapid secession of spark (multi-sparking) will occur during 70 degrees of engine rotation in the cylinder pair whose pistons are approaching TDC. This condition will continue until engine reaches 850 RPM and will reactivate if engine speed drops below 420 RPM. If engine fails to start, multi-sparking will occur in all cylinders to remove spark plug electrode deposits.