Turbocharger diagnostics and checks (Defender 2007+)

Inspection and verification

1.

Warnings:

• The following checks may require working near hot parts. Wear appropriate protective equipment. Failure to do so 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 has been turned off. Failure to do so may result in injury.

Check the customer complaint.

2. Visually inspect for obvious mechanical and electrical problems.

Visual inspection

Mechanical elements	Electrical equipment
• Air intake system • Hose(s)/hose connections • Turbocharger (turbocharging) • General condition of the engine.	• Electrical circuit(s) • Electrical connectors and wiring harnesses • Turbocharger drive • Engine Control Module (ECM)

3. If an obvious cause for the problem you identified or the customer described is found, resolve it before proceeding with further actions (if possible).

(The article was copied from the website: www.lrman.ru)

4. Before referring to the symptom chart or diagnostic trouble code (DTC) index, read all DTCs with a validated diagnostic system or scan tool.

• Clear all DTCs after troubleshooting.

Table of signs of malfunction

Sign	Possible reason	Operation
Low power (lack of boost)	Turbocharger actuator failure Low fuel level/contamination Limited air intake General condition of the engine Engine Control Module (ECM) Malfunction Turbocharger actuator failure	Check that the variable geometry turbocharger actuator lever moves freely. For more information, refer to: Turbocharger actuator rod (303-04B Fuel Delivery and Controls - Turbocharger - ID4 2.4L Diesel Engine, Removal and Installation). Check the fuel level and condition. Drain approximately 1 quart of fuel and let it sit for 1 minute. Check for separation indicating water or other liquid in the fuel. Check the air intake system for restriction. Check engine condition, compression, etc. for signs of mechanical failure. Check for DTCs indicating a faulty unit. If ECM failure is suspected, refer to the warranty policy and procedures manual. Check for free movement of the variable geometry turbocharger actuator lever. For additional information, refer to: Turbocharger Actuator Rod (303-04B Fuel Delivery and Controls - Turbocharger - ID4 2.4L Diesel Engine, Removal and Installation).
No boost	Electrical connectors and wiring harnesses Limited air intake Charge air cooler clogged/leaking Turbocharger actuator failure Turbocharger failure Block malfunction	check the electrical connectors and wiring harnesses for the engine control system (ECM). Check the air intake system for blockages/leaks. Check the drive and electrical circuits of the turbocharger. Refer to the electrical equipment manuals. Check the turbocharger for wear. Disconnect the intake and exhaust piping system and manually scroll 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 unit with the new turbocharger. Check the DTC fault codes that indicate a malfunction of the actuator or block. If an ECM malfunction is suspected, refer to the Warranty Service Policy and Procedures manual.
No boost/excessive noise	Turbocharger actuator failure Turbocharger failure	Check if the variable geometry turbocharger drive lever moves freely. For more information, refer to: Turbocharger Drive Rod (303-04B Fuel Delivery and Controls - Turbocharger - ID4 2.4L Diesel Engine, Removal and Installation). Disconnect the intake and exhaust manifolds and manually rotate the turbocharger shaft. Any roughness when rotating indicates a malfunction. Check the turbocharger shaft for any lateral movement. Excessive movement indicates a malfunction. If in doubt, compare the suspect unit with a new turbocharger.

For a complete list of diagnostic trouble codes that may be stored in the vehicle, see Section 100-00. For additional information, refer to: How to Use This Manual (100-00 General information, Description and operating principle).