Inspection and verification
1.
Warnings:
- During the following checks, it may be necessary to work close to hot parts. Wear appropriate protective equipment. Failure to follow this instruction may result in injury.
- The turbocharger may continue to rotate after the engine has stopped. Do not attempt to test the turbocharger until at least one minute has passed since the engine was turned off. Failure to follow this instruction may result in injury.
Check the customer's complaint.
2. Visually inspect for obvious mechanical and electrical problems.
Visual check
Mechanical elements |
electrical equipment |
• Air intake system • Hose (And) /hose connections • Turbocharger (turbocharging) • General condition of the engine. |
• Electrical circuit (And) • Electrical connectors and wiring harnesses • Turbocharger drive • The engine control unit (ECM) |
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 reason | Operation |
low power (no boost) | Check for free movement of variable geometry turbocharger actuator lever For more information refer to: Turbocharger actuator rod (303-04B Fuel supply and controls - turbocharger - ID4 2.4L diesel engine, Removal - Refitting). Check the level and condition of the fuel. Drain approximately 1 liter of fuel and let it sit for 1 minute. Check that there is no separation indicating the presence of water or other liquid in the fuel. Check the air intake system for constriction. Check engine condition, compression, etc. for signs of mechanical failure. Check for DTCs indicating a malfunction of the unit. If an ECM malfunction is suspected, refer to the Warranty Policy and Procedures Manual. Check for free movement of variable geometry turbocharger actuator lever For more information refer to: Turbocharger actuator rod (303-04B Fuel supply and controls - turbocharger - ID4 2.4L diesel engine, Removal - Refitting). | |
No boost | engine control (ECM) Check electrical connectors and wiring harnesses. Check air intake system for blockage/leakage. Check turbocharger actuator and electrical circuits. Refer to electrical manuals. Check the turbocharger for wear. Disconnect the intake and exhaust piping and manually turn the turbocharger shaft. Any roughness when turning indicates a malfunction. Check the turbocharger shaft for any lateral movement. Excessive movement indicates a malfunction. If in doubt, compare the suspicious block with a new turbocharger. Check for DTCs indicating an actuator or unit failure. If an ECM malfunction is suspected, refer to the Warranty Policy and Procedures Manual. | |
No boost/excessive noise | Check for free movement of variable geometry turbocharger actuator lever For more information refer to: Tubocharger actuator rod (303-04B Fuel supply and controls - turbocharger - ID4 2.4L diesel engine, Removal - Refitting). Disconnect the intake and exhaust piping and manually turn the turbocharger shaft. Any roughness when turning indicates a malfunction. Check the turbocharger shaft for any lateral movement. Excessive movement indicates a malfunction. If in doubt, compare the suspicious block with a new turbocharger. |
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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