1.15.16 Diagnosis of idle speed control (ISC): Notes

P0507 (LLRmax), P0506 (LLRmin), P1562 (LLRKHmax), P1561 (LLRKHmin), 

The diagnosis of the idle speed control (ISC) checks whether there is a permanent deviation of the actual idle speed from its target value. The check consists of a diagnosis which is performed during cold start and of a second diagnosis which runs if the engine is warm. Both diagnoses work the same way with slight differences in threshold limits, debouncing time and monitoring conditions.