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.
1999 Mercedes Benz ML320FACTORY OEM SERVICE PROCEDURE
Engine Controls - Self-Diagnostics With Codes
- Introduction
- Model Identification
- Production Date Information
- Self-Diagnostic System
- How To Read Diagnostic Information
- Component/Circuit Identification
- ECM Connector Identification
- Diagnostic Trouble Code Identification
- Notes
- Symptom Diagnostics
- Fuel Injection System Tests
- Fuel Injection System Test (Steps 1.0 & 1.1)
- Fuel Injection System Test (Steps 1.2-2.2)
- Fuel Injection System Test (Steps 3.0 & 3.1)
- Fuel Injection System Test (Steps 4.0-4.2)
- Fuel Injection System Test (Steps 4.3 & 5.0)
- Fuel Injection System Test (Steps 5.1 & 6.0)
- Fuel Injection System Test (Step 7.0)
- Fuel Injection System Test (Steps 8.0 & 8.1)
- Fuel Injection System Test (Steps 8.2 & 9.0)
- Fuel Injection System Test (Steps 10.0-12.0)
- Fuel Injection System Test (Steps 13.0 & 14.0)
- Fuel Injection System Test (Steps 15.0 & 16.0)
- Fuel Injection System Test (Step 17.0)
- Fuel Injection System Test (Step 18.0)
- Fuel Injection System Test (Step 19.0)
- Fuel Injection System Test (Step 20.0)
- Fuel Injection System Test (Step 21.0)
- Fuel Injection System Test (Step 22.0)
- Fuel Injection System Test (Step 23.0)
- Fuel Injection System Test (Steps 24.0 & 25.0)
- Fuel Injection System Test (Step 26.0)
- Fuel Injection System Test (Step 27.0)
- Fuel Injection System Test (Steps 28.0 & 29.0)
- Fuel Injection System Test (Steps 30.0 & 31.0)
- Fuel Injection System Test (Steps 32.0-33.1)
- Fuel Injection System Test (Steps 34.0-34.2)
- Fuel Injection System Test (Steps 35.0 & 35.1)
- Fuel Injection System Test (Steps 36.0-38.0)
- Ignition System Tests
- Notes
- Ignition System Test (Steps 1.0 & 1.1)
- Ignition System Test (Steps 1.2-2.2)
- Ignition System Test (Steps 3.0 & 4.0)
- Ignition System Test (Steps 5.0 & 6.0)
- Ignition System Test (Steps 7.0 & 8.0)
- Ignition System Test (Steps 9.0 & 9.1)
- Ignition System Test (Steps 10.0 & 10.1)
- Ignition System Test (Steps 11.0-12.0)
- Ignition System Test (Steps 12.1-13.1)
- Ignition System Test (Steps 14.0-15.0)
- Ignition System Test (Steps 15.1-16.1)
- Ignition System Test (Step 17.0)
- Electronic Accelerator Tests
- Cruise Control Tests
- Fuel Injector Tests
- DTC Description
- Fuel Pump Tests
- Signal Pattern Identification
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.