Vehicle
2019 Ford Mondeo 2.0L Diesel
Title
P04D9-00, Cleaned Exhaust Gas Recirculation Valve
Complaint
The customer states that the check engine light is on.
Cause
Connected a scan tool and found code P04D900 – Closed Loop Exhaust Gas Recirculation Valve Control At Limit – Flow Too Low. Performed a road test, used the scan tool to monitor live data and found the exhaust gas recirculation valve parameter was below specifications. Key on engine off, used the scan tool to command the exhaust gas recirculation valve on and found the valve was inoperative. Performed an inspection of the exhaust gas recirculation valve wiring harness and connectors, and found there were no loose connections or signs of damage. With the key on, engine off, used a multi-meter to check for the presence of voltage and ground at the exhaust gas recirculation valve and found both were present. Used a set of fused jumper wires to repeatedly apply voltage and ground to the exhaust gas recirculation valve, and found the valve was inoperative. Removed the exhaust gas recirculation valve, performed a visual inspection of the exhaust gas recirculation valve and found it was clogged with carbon.
Correction
Cleaned the exhaust gas recirculation valve, cleared codes, performed a road test and verified the vehicle operated properly. The check engine light did not illuminate and no fault codes returned.