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.
12 13 Notes on checking ignition system
Troubleshooting
--> Fault in fuel injection system, refer to 12 13 NOTES ON CHECKING IGNITION SYSTEM .
--> Spark plug faults, refer to SPARK PLUG FAULTS .
--> Ignition coil faults, refer to IGNITION COIL FAULTS .
--> Further fault patterns with evaluation, refer to FURTHER FAULT PATTERNS WITH EVALUATION .
--> Additional fault notes for troubleshooting, refer to ADDITIONAL FAULT NOTES FOR TROUBLESHOOTING .
Oscillograms
--> Normal oscillogram, refer to NORMAL OSCILLOGRAM (M, S, W ENGINES ONLY) .
--> Oscillograms of ignition coils from different manufacturers, refer to OSCILLOGRAMS OF IGNITION COILS FROM DIFFERENT MANUFACTURERS .
Check
--> Secondary signal for stationary ignition distribution, refer to 12 13... CHECKING SECONDARY SIGNAL FOR STATIONARY IGNITION DISTRIBUTION .
NO RELATED
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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.