One of the latest in the series of Blue Print PROTIP technical bulletins for garages concerns a common issue is encountered on the Suction Control Valve of popular Toyota models.

Blue Print offers a high quality replacement valve (Part No.: ADT36853) which fits two common cars on Irish roads, the Toyota Avensis II (2003-2011) and Corolla IX (2000-2009).

Problems such as engine surging, erratic idle, and a sudden lack of power, all of which can often be intermittent, are due to a suction control valve problem. However, the engine fault codes logged relate to fuel rail pressure deviation.

The cause is that the suction control valve (SCV) solenoid has extremely fine tolerances within its moving parts, which are quickly affected by dirt and/or contaminated fuel. A worn or contaminated SCV will cause the high-pressure fuel pump to deliver an inconsistent fuel pressure compared to what is being requested by the ECU. Irregular fuel pressure at the injectors can cause surging as the ECU attempts to find the correct operating fuel pressure.

Blue Print says the solution is to replace the SCV in a safe and clean working environment where no dirt particles enter the fuel pump. The technician should also check the fuel system for contamination and replace the fuel filter as well as the SCV.

When removing the SCV, the connector position of the SCV to the pump should be noted. Bolts and O-ring should be removed and a new large O-ring installed to the fuel pump. The technician should then screw the two new guide pins into the mounting holes and apply engine oil to the small O-ring located on the SCV before fitting to the pump. The SCV is installed by carefully pushing it into the housing.

When the SCV is in position, the fitter should remove the guide pins, fit the new bolts, and tighten them according to the manufacturer’s torque settings. Once the installation is complete, the technician should carry out the supply pump learning procedure and perform a high-pressure pump test using a suitable diagnostic tool to confirm that there are no leaks and that the fuel system is functioning correctly.

More technical information and a full Blue Print parts catalogue can be found at: partsfinder.bilsteingroup.com