An ignition system with direct ignition coils is used.
This provides a more stable combustion process with reduced exhaust gas emissions.
On this ignition system, a direct ignition coil is needed for each spark plug, and this is located directly on the spark plug.
Only one ignition spark is generated for each direct ignition coil in the compression stroke.
To do this, the Powertrain Control Module (PCM) evaluates the signals from the Camshaft Position (CMP) sensor and the Crankshaft Position (CKP) sensor.
The CMP sensor identifies cylinder "1" by scanning the camshaft timing pulley.
The ignition system requires this information in order to synchronise the ignition sparks of the individual ignition coils.
If the CMP sensor should fail, the system uses the signal from the CKP and ignites cylinders "1" and "4" or "2" and "3" together. Here ignition takes place in the working cycle of one cylinder and in the exhaust cycle of the other.
WDS can be used to diagnose the system.
