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 |
• Engine ventilation hoses • Oil separator • Exhaust gas recirculation system tubes (checking for cracks, leaks in connections or from gaskets) • Exhaust gas recirculation valve (EGR) • Heat exchanger (And) EGR |
• Fuses • Wiring harness • Loose or corroded connectors • Exhaust gas recirculation valve (EGR) • 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
Symptom (specific) | Possible reason | Operation |
Difficult start. Rough/erratic idling. Lack of power during acceleration | EGR valve sticking (EGR) in the open position | NOTE: Make sure the latest throttle inlet EGR valve is installed. Using the manufacturer approved diagnostic system, check and install the latest software on the engine control unit. Check the EGR valve and circuits. Refer to electrical manuals. Check the mechanical condition of the EGR valve. Repair if necessary. |
Engine stops/stops | NOTE: Make sure the latest throttle inlet EGR valve is installed. Using the manufacturer approved diagnostic system, check and install the latest software on the engine control unit. Check the EGR valve and circuits. Refer to electrical manuals. Check the mechanical condition of the EGR valve. Check engine ventilation system. Check oil separator. For more information, refer to: Emissions Reduction (303-08 Emission Control - ID4 2.4L Diesel Engine, Description and Operation). Check for DTCs indicating a problem with the EGR valve, throttle body, or sensor. Repair if necessary. | |
Excessive fuel consumption. Increased amount of black smoke. Increased exhaust | NOTE: Make sure the latest throttle inlet EGR valve is installed. Using the manufacturer approved diagnostic system, check and install the latest software on the engine control unit. Check the EGR valve and circuits. Refer to electrical manuals. Check the mechanical condition of the EGR valve. Check engine ventilation system. Check oil separator. For more information, refer to: Emissions Reduction (303-08 Emission Control - ID4 2.4L Diesel Engine, Description and Operation). Check for DTCs indicating a problem with the EGR valve, throttle body, or sensor. Repair if necessary. | |
Increased gas breakthrough | Decrease in air flow / blockage of the ventilation system | Check engine ventilation hoses. Check oil separator. For more information, refer to: Emissions Reduction (303-08 Emission Control - ID4 2.4L Diesel Engine, Description and Operation). Repair if necessary. |
Engine oil leaks | Decrease in air flow / blockage of the ventilation system | Check engine ventilation hoses. Check oil separator. For more information refer to: Emissions Reduction (303-08 Emission Control - ID4 2.4L Diesel Engine, Description and Operation). 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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