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.
2002 Mercedes Benz ML320FACTORY OEM SERVICE PROCEDURE
Service Precautions
WARNING:
DO NOT perform testing or repair procedures on ignition system if you have a heart pacemaker.
- Turn ignition off before connecting or disconnecting ME-SFI control module connectors.
- DO NOT ground ignition coil terminal No. 1 (of any ignition coil) as a theft deterrent.
- When cranking or idling engine, DO NOT disconnect ignition coil cable or spark plug cable.
- Ignition system high output side must carry at least 2 k-ohms of load.
- Turn ignition off when connecting or disconnecting test equipment at ignition coil.
- DO NOT connect a test light to ignition coil circuit No. 1 or 15.
- When performing an ignition spark test, check one spark plug at a time and ensure spark plug is grounded.
- When performing compression test, ensure ignition system is disabled. Additionally disconnect ME-SFI control module connector No. 2.
Factory Service Tools
Use the Manual With the Right Hardware
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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.