Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.