سير التوقيت تالف

The timing belt broken, stripped or jumped. On an interference engine this is catastrophic — the pistons meet open valves — and on a non-interference one the engine simply stops. Either way the crankshaft and camshaft references no longer agree and the module reports correlation.

A belt that has jumped a tooth rather than broken is the more diagnosable case: the engine runs badly, down on power, with correlation codes and possibly a misfire. Check the timing marks before anything electronic, since a module cannot compensate for a mechanical offset. The reason it failed matters for the repair — a seized tensioner, a leaking water pump driven by the belt, or a missed service interval will take the new belt too, so the ancillaries are part of the job rather than an upsell.