Inspection and verification
1. Check the customer's complaint.
2. Visually inspect for obvious signs of mechanical or electrical damage.
Visual check
Mechanical elements |
electrical equipment |
• Hoses and ducts: condition and installation • Condition and installation of the air filter element • Reducing the capacity of the air intake system • Condition and installation of vacuum hoses • Piping to and from the turbocharger: condition and installation • Turbocharger: condition and installation • Air cooler |
• Fuses • Harness (s) electrical wiring • Weak or corroded connectors • Mass air flow sensor (MAF) • Manifold absolute pressure and temperature sensors (MAPT) • Air intake temperature sensor (IAT) • IAT sensor 1 is part of the MAF sensor |
3. If there is an obvious reason for the problem you identified or described by the client, eliminate it before proceeding to further actions (if possible).
4. Before Referring to the Symptom Table or DTC Index (DTC) read all DTCs with a validated diagnostic system or scan tool.
- Clear all DTCs after troubleshooting.
Symptom table
sign | Possible reasons | Operation |
Vehicle won't start/difficult to start | Check the air intake system for blockage or obstruction. Repair if necessary. | |
Poor dynamic performance | NOTE: Make sure the latest throttle inlet EGR valve is installed. Using the manufacturer approved diagnostic system, check and update the engine control unit with the latest software version. Check if the variable geometry turbocharger actuator lever moves. For more information refer to: Turbocharger actuator rod (303-04B Fuel supply and controls - turbocharger - ID4 2.4L diesel engine, Removal - Refitting). Check the air intake system for blockage or obstruction. Repair if necessary. Check for DTCs indicating a faulty turbocharger, EGR valve, or incorrect fuel pressure. Repair if necessary. Check the exhaust system for signs of damage or blockage. Repair if necessary. | |
Increased intake noise | Check that the hoses or ducts of the air intake system are securely fastened. Check hoses and air ducts for damage, cracks, etc. Repair if necessary. |
See section 100-00 for a complete list of DTCs that can be logged in the vehicle. For more information, see: How to use this manual (100-00 General information, Description and principle of operation).
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