Vehicles equipped with dCi (diesel Common rail injection) engines, particularly the 1.5 dCi (K9K) and 2.0 dCi (M9R) engines. 2. Technical Description DF004 is defined by Renault as: “Fuel pressure regulator circuit – Coherence” or “Fuel pressure regulator control – Open circuit or short circuit to earth/battery.” In simpler terms: The engine control unit (ECU) has detected an electrical or logical malfunction in the control circuit of the fuel pressure regulator, which is mounted on the high-pressure fuel pump (HPFP).
| Parameter | Normal | Fault indication | |-----------|--------|------------------| | Desired fuel pressure (bar) | 250-1600 | – | | Actual fuel pressure (bar) | Should track desired | Stuck low or erratic | | PCV duty cycle (%) | 20-80% | 0% or 100% stuck | | Rail pressure vs. desired deviation | < 50 bar | Large mismatch | renault dacia samsung renault error df004
1. Overview Error Code: DF004 Manufacturer Group: Renault Group (including Renault, Dacia, and Renault Samsung Motors) System Affected: Engine Management / Diesel Injection System Component: Fuel High Pressure Circuit – specifically, the Fuel Pressure Regulator (PCV – Pressure Control Valve) or its electrical circuit. Vehicles equipped with dCi (diesel Common rail injection)