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.
Ignition circuit monitoring
The ignition circuit is monitored on the basis of the current in the primary coil of the ignition coil. When the engine is switched on, the current must stay within specific values during certain time thresholds. The ignition diagnosis monitors the:
- Primary circuit of the ignition coil
- Wiring harness for the ignition
- Secondary circuit of the ignition coil with spark plug
- Spark duration.
The following faults can be detected by the ignition circuit monitoring:
- Short circuit at the primary side of the ignition coil
- Short circuit on the secondary side of the ignition coil
- Spark plug
- Line disconnection of the activation
- Faulty ignition output stages.
The following cannot be detected:
- Sporadic faults such as loose contacts in the actuating wire
- Flashovers in the high voltage circuit parallel to the spark gap without the formation of an interturn fault.
We can assume no liability for printing errors or inaccuracies in this document and reserve the right to introduce technical modifications at any time.
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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.