How to diagnose and solve a DPF fault on Renault C520
The Renault C520 Euro 6 is equipped with the DTI13 engine. Coming from Volvo (D13K engine), it includes an anti-pollution system which includes the EGR valve, the particulate filter and the AdBlue system (SCR).
To summarize the situation, we have on the dashboard different faults present in the EMS module as well as ACM. The purpose of the operation is to solve the problem of engine performance restriction and to eliminate and permanently eradicate the regenerations as well as the injection of urea.
Error codes and consequences of an FAP fault on Renault C520
Error codes P24A200, P204F93, P207F9A and P20F400 indicate problems with the NOx emission reduction system (SCR) and the particulate filter (DPF) of the DTI13 Renault Euro 6 engine.
P24A200: This error code indicates that the regeneration of the diesel particulate filter is not complete. This can be caused by a lack of heat in the particulate filter, insufficient regeneration or a faulty differential pressure sensor.
P204F93: This error code indicates a dosing fault in the SCR (Selective Catalytic Reduction) system. This can be caused by a lack of urea in the AdBlue tank, a faulty urea pump, a faulty urea temperature sensor or a faulty urea pressure sensor or even a flow problem at the the AdBlue pump.
The P207F9A code indicates a problem with the quality of the reducing agent, which is usually urea (AdBlue) used to convert NOx to nitrogen and water vapor. This code can be caused by a lack of urea in the tank, a leak in the system, or a malfunction in the urea dosing system.
Finally, the code P20F400 meanwhile indicates too low adblue consumption, too low.
Negative consequences of these defects
When you have these fault codes stored in the ACM for some and in the EMS for others then your truck will go into degraded mode. That is to say that you have an engine light, an engine torque restriction counter in a certain number of hours. After the hour restriction expires, the truck suffers a loss of performance. (lack of torque and power). In addition, depending on the level of severity, and if you continue to drive in degraded mode for too long, it will stop at 20 km/h.
How to reprogram and remove these faults permanently?
Repair operations mainly consist of reprogramming the software of the ECU (Engine Control Unit) and the ACM (Aftertreatment Control Module). It suppresses the particle filter regeneration functions and the injection of urea (AdBlue) in the SCR system. This is done by changing the engine operating parameters and disabling the error codes associated with these functions.
The software update of the ECU and the ACM makes it possible to deactivate the communication between these two components, thus preventing the regenerations and the injection of AdBlue. This may also include modifying operating parameters such as temperature and pressure thresholds for the various sensors and actuators related to the exhaust gas aftertreatment system. It is also possible to condemn the EGR valve to prevent any escape of exhaust gases to the engine and thus improve performance.
Removal of torque constraints on Renault C520
Torque restriction is another safety measure used to limit engine performance in the event of an exhaust after-treatment system failure. It is activated when the sensors detect an anomaly in the exhaust system, such as a clogged particulate filter or overheating of the EGR valve. Torque restriction limits the maximum power the engine can deliver, protecting the engine and exhaust system from damage.
The software update for the ECU (Engine Control Unit) and ACM (Throttle Aftertreatment Module) allows these safety features to be disabled by inhibiting Particulate Filter regenerations and fuel injection. AdBlue, as well as condemning the EGR valve. This update also removes fault codes related to these systems and allows the engine to run at full power.
For more information on Renault Euro 6
We hope that our article has helped you in your research, for any intervention do not hesitate to contact us. You can also consult our special Renault page and our other operations on Renault Euro 6
