Maintenance Tips

scv signs of a faulty suction control valve

A Suction Control Valve (SCV) is a component put on the supply pump of a common rail diesel engine. The HILUX SCV (Suction Control Valve) controls the fuel pressure in the delivery pipe (rail), ensuring that the fuel pressure is always consistent with the ECU target and engine requirements.

The ECU directly regulates the Suction Control Valve (SCV), which operates dynamically in response to engine conditions. Because the ECU controls the HILUX SCV directly, if there is a problem with this component, the Malfunction Indicator Lamp (MIL) will usually illuminate.

scv signs of a faulty suction control valve

Low-quality diesel fuel, such as that that has been stored for a long time or that has been polluted with other fluids, might cause a terrible SCV.

The ECU displays diagnostic codes P0089 (Suction Control Valve stuck), P0628 (Suction Control Valve open), and/or P1275 (Suction Control Valve open) for a malfunctioning SCV (Supply Pump exchange). As a side note, the aforesaid DTCs were detected in Montero sports vehicles manufactured between 2010 and 2016. (data may vary for other car brands).

However, there was a faulty SCV on multiple instances, but the check engine light did not illuminate. The symptoms of a faulty SCV, which is frequent in common rail diesel engines, are listed below.

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1. The engine has a habit of shutting down unexpectedly.

The engine shutting down unexpectedly is a common indicator of a faulty SCV. Some come to a rapid halt after being turned on (engine runs for a few seconds before stopping), while others have been operating for several minutes before coming to a halt.

The Suction Control Valve (SCV) is a common rail actuator that controls the fuel pressure in the delivery pipe (rail). When the SCV is destroyed, the engine’s required fuel pressure is lost.
As a result, the fuel rail will lose pressure, and the injector will be unable to inject the fuel properly. It is for this reason that the common rail diesel engine will eventually come to a complete stop.

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2. Even though it is simple to start, the engine is difficult to run.

The engine is difficult to start and run when it has a faulty SCV, which is typical in common rail diesel engines. This circumstance can arise if the fuel supply that should be injected into the combustion chamber by the injector does not occur.

After all, the fuel pressure inside the delivery pipe (rail) is insufficient to produce a gasoline mist that meets engine requirements. The engine may still have time to start, but it will usually stop as soon as the present fuel pressure drops below the needed level and cannot be sustained.

3. Even though the gas is fully open, the engine rpm remains stuck at 1500-2000 rpm.

When completely gassed, the engine rpm remains stuck at 1500-2000 rpm, which is an indication of a malfunctioning SCV commonly found on common rail diesel engines. This issue usually occurs without any unusual engine symptoms.

The engine starts easily, the idling rpm is typical, and there are no signs of bruising, limping, or hunting when it is started. Even if we have fully stepped on the gas pedal, the engine rpm remains locked around 1500-2000 rpm when driving the automobile. In addition, the engine’s power decreases.

Yes, because the fuel pressure inside the rail pie is insufficient for a common rail diesel engine, this circumstance will occur. There will be a significant difference in pressure from the manufacturer’s standard setting, resulting in a discrepancy between the actual fuel injection amount and the computer setting. As a result, even with the gas pedal completely depressed, the engine develops low power, retains rpm, and lacks power.

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