Diagnostics and tests to reduce exhaust toxicity (Defender 2007+)

Inspection and verification

1. Check the customer complaint.

2. Visually inspect for obvious signs of mechanical or electrical damage.

Visual inspection

Mechanical elements	Electrical equipment
• Engine ventilation hoses • Oil separator • Exhaust gas recirculation tubes (checking for cracks, leaks in connections or gaskets) • Exhaust Gas Recirculation (EGR) valve • EGR heat exchanger(s)	• Fuses • Wiring harness • Poorly attached or corroded connectors • Exhaust Gas Recirculation (EGR) valve • 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).

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 of malfunction (specific)	Possible reason	Operation
Hard starting. Rough/erratic idle. Lack of power when accelerating	Exhaust Gas Recirculation (EGR) valve stuck open	NOTE: Ensure that the latest version of the EGR throttle inlet valve is installed. Using the manufacturer approved diagnostic system, check and install the latest software version on the ECM. Check the EGR valve and electrical circuits. Refer to electrical manuals. Check the mechanical condition of the EGR valve. Repair if necessary.
Engine stops/stalls	Exhaust Gas Recirculation (EGR) valve stuck open Disconnection/reduction in flow capacity/blockage of ventilation system	NOTE: Ensure that the latest version of the EGR throttle inlet valve is installed. Using the manufacturer approved diagnostic system, check and install the latest software version on the ECM. Check the EGR valve and electrical circuits. Refer to the electrical manuals. Check the mechanical condition of the EGR valve. Check the engine ventilation system. Check the oil separator. For more information, refer to: Reducing Emission Pollution (303-08 Emission Control - ID4 2.4L Diesel Engine, Description and Operating Principle). Check for DTCs indicating a faulty EGR valve, throttle body or sensor. Repair as necessary.
Excessive fuel consumption. Increased amount of black smoke. Increased exhaust	Exhaust Gas Recirculation (EGR) valve stuck open EGR not working Reduced throughput/blockage of ventilation system	NOTE: Ensure that the latest version of the EGR throttle inlet valve is installed. Using the manufacturer approved diagnostic system, check and install the latest software version on the ECM. Check the EGR valve and electrical circuits. Refer to the electrical manuals. Check the mechanical condition of the EGR valve. Check the engine ventilation system. Check the oil separator. For more information, refer to: Reducing Emission Pollution (303-08 Emission Control - ID4 2.4L Diesel Engine, Description and Operating Principle). Check for DTCs indicating a faulty EGR valve, throttle body or sensor. Repair as necessary.
Increased gas breakthrough	Reduced throughput/blockage of ventilation system	Check the engine ventilation hoses. Check the oil separator. For more information, refer to: Reducing Exhaust Toxicity (303-08 Emission Control - ID4 2.4L Diesel Engine, Description and Operating Principle). Repair if necessary.
Engine oil leaks	Reduced throughput/blockage of ventilation system	Check the engine ventilation hoses. Check the oil separator. For more information, refer to: Reducing Exhaust Toxicity (303-08 Emission Control - ID4 2.4L Diesel Engine, Description and Operating Principle). Repair if necessary.

(The article was copied from a resource: LRman.ru)

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).