How to diagnose and solve an FAP fault on a Renault C520
The Renault C520 Euro 6 is equipped with the DTI13 engine. Derived from Volvo (D13K engine), it features an anti-pollution system that includes the EGR valve, particulate filter and AdBlue (SCR) system.
To sum up the situation, the dashboard shows various faults in the EMS and ACM modules. The aim of the operation is to resolve the problem of engine performance restrictions, and to eliminate regeneration and urea injection once and for all.
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 particulate filter (DPF) on the DTI13 Renault Euro 6 engine.
P24A200: This error code indicates incomplete regeneration of the diesel particulate filter. This may be caused by a lack of heat in the particulate filter, insufficient regeneration or a differential pressure sensor fault.
P204F93: This error code indicates a metering fault in the SCR (Selective Catalytic Reduction) system. This may be caused by a lack of urea in the AdBlue tank, a urea pump fault, a urea temperature sensor fault or a urea pressure sensor fault, or a flow problem with the AdBlue pump.
Code P207F9A indicates a problem with the quality of the reducing agent, which is usually urea (AdBlue) used to convert NOx into nitrogen and water vapor. This code may be caused by a lack of urea in the tank, a leak in the system, or a malfunction in the urea dosing system.
Finally, code P20F400 indicates low adblue consumption.
Negative consequences of these defects
When these fault codes are stored in the ACM for some, and in the EMS for others, your truck will go into degraded mode. In other words, you have an engine warning light and an engine torque restriction counter within a certain number of hours. Once the hour restriction has expired, the truck suffers a loss of performance. (lack of torque and power). What's more, depending on the level of severity, if you continue to drive in degraded mode for too long, your truck will be restricted to 20km/h.
How can you reprogram and remove these defects permanently?
Repair operations mainly involve reprogramming the ECU (Engine Control Unit) and ACM (Aftertreatment Control Module) software. It removes the regeneration functions of the particulate filter and urea (AdBlue) injection in the SCR system. This is achieved by modifying the engine operating parameters and disabling the error codes associated with these functions.
By updating the ECU and ACM software, communication between these two components can be deactivated, preventing regeneration and AdBlue injection. This can also include modifying operating parameters such as temperature and pressure thresholds for the various sensors and actuators linked to the exhaust aftertreatment system. It is also possible to shut off the EGR valve to prevent exhaust gases leaking back into the engine, thus improving performance.
Removal of torque constraints on Renault C520
Torque restriction is another safety measure used to limit engine performance in the event of exhaust aftertreatment system failure. It is activated when sensors detect an anomaly in the exhaust system, such as a clogged particulate filter or an overheated 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 (exhaust aftertreatment module) enables these safety functions to be deactivated by inhibiting particulate filter regeneration and AdBlue injection, as well as condemning the EGR valve. This update also removes the fault codes associated with these systems, allowing the engine to run at full power.
For more information on Renault Euro 6
We hope our article has helped you in your search. If you have any questions, please do not hesitate to contact us. You can also consult our special Renault page and our other Renault Euro 6 operations.
