The Smart 453 3-cylinder petrol engine is equipped with a camshaft control solenoid, a vital component that manages the flow of oil pressure to the variable cam timing (VCT) system. This solenoid is located at the top of the engine’s timing cover on the right-hand side, making it relatively accessible for inspection and maintenance.
Visually, the solenoid is easy to identify due to its distinctive features: it has a bright green 2-pin electrical connector and is secured in place with a single 8mm retaining bolt. The green connector helps distinguish it from other engine components, and its placement at the top of the timing cover allows for straightforward removal if needed.
The primary function of this solenoid is to control the oil flow to the cam adjuster, which in turn modulates the camshaft position to optimize engine performance, fuel efficiency, and emissions. By adjusting the timing of the camshaft, the engine can operate more efficiently across different RPM ranges.
However, it’s common for this solenoid to become clogged or contaminated over time, especially in vehicles that have not received regular maintenance or oil changes. Deposits and sludge can accumulate inside the solenoid, impairing its ability to operate correctly. When this happens, drivers may notice symptoms such as a lumpy or rough idle, hesitation during acceleration, or even engine warning lights related to timing or crankshaft/camshaft correlation faults.
In many cases, cleaning the solenoid can resolve these issues. To do this, the sensor must be removed: simply disconnect the electrical loom by unplugging the connector, then remove the single 8mm bolt securing it. Once out, the solenoid can be cleaned using brake cleaner or carburetor cleaner, which effectively dissolves oil varnish and debris. After cleaning, reinstallation is straightforward.
If cleaning does not restore proper operation, or if the solenoid is damaged or faulty, replacement is recommended. The part number for this component is Renault part number 237964892R, which is compatible with Smart 453 models.
In summary, regular inspection and cleaning of the camshaft control solenoid can help maintain optimal engine performance and prevent timing-related faults. It’s a relatively simple maintenance task that can save time and cost compared to more extensive repairs.