In this type of ignition system, the ignition timing is constantly monitored by the ECU of the engine management system and cannot be verified.
The only way to check the ignition timing is to use special electronic diagnostic equipment connected to the engine management system through a diagnostic clutch (see the relevant Part of the Chapter for more details Power and exhaust systems). No adjustment of the ignition timing is possible. If the ignition timing is set incorrectly, a malfunction may also be present in the engine management system.