Toyota RAV 4 with Poor Acceleration Problems? Caused by the “Suction Control Valve” (SCV)

Toyota RAV 4 problem just happened overnight

As I have said before, one of the great things about owning a garage is the diversity of jobs that we can encounter in any busy working week. This past week was no exception. One of our

Toyota RAV 4

The Toyota RAV 4 ready for the engine work to be carried out.

lady customers called it with her car, a Toyota RAV 4, the reason was that the car was performing badly when trying to overtake, when she put her foot down the car was slow to respond.

She had a Duel Mass Flywheel done on it about six months ago and she had wondered if this could have anything to do with the cars problem? The Toyota RAV 4 was fitted with the 2.0D-4D engine, but she had not experienced many engine problems in the past, in fact apart from the clutch the car had been trouble free.

When Ryan our workshop manager took the car out for a test drive he noticed that the engine warning light was also illuminated and so on his return he plugged the car into our diagnostics machine to find that the code PO627 came up. When we looked the code fault up it stated that the problem could be a couple of things.

1: That the internal fuel was below the target fuel pressure that it should be, despite the engine ECU opens the Suction Control Valve (SCV)

2: Fuel blockage.

Toyota RAV 42.0 D Engines are fitted with a Denso electronic high-pressure fuel pump and control the fuel rail pressure and the volume of fuel and are both replaceable items. Denso also make the Fuel Pressure Regulator (we call it the SCV) that can cause the lack of power problems with the Toyota RAV4

Toyota RAV 4

Arrow pointing at the position of the diesel pump

Problems.

Ryan suspected it to be the SCV and this was confirmed by a quick phone call to a friend of ours that specialises in diesel engines and fuel pumps. He told us that the SCV Valves had given most him most problems with this particular RAV 4 engine fault and so we took onto ourselves to tackle this particular problem.

New SCV ordered for the Toyota RAV 4

We contacted the customer with a price and she gave us the go ahead to carry out the necessary work on the car’s engine. We could only buy the SCV parts from the Toyota dealership, as they were not available from any of the local parts factors.

The first part of the job was to remove the two bolts that fasten the radiator expansion tank to the car, this allows you more room to work, and you can see this in the picture the arrow is pointing to where the fuel pump is located. Down near the yellow dipstick top. Ryan then had to remove the remove the air intake/inter-cooler pipe.

The only difficult thing that Ryan could see was the location of the pump, that the SCV’s were located; they were located at the back of the pump, making the job a little fiddly.

When the new Toyota RAV 4 valves arrived, they were both coloured differently, one was green and the other red. It was important that the new ones had to fit where the old ones had come from,

Toyota RAV 4

Image showing the SCV valves in position ready to be changed, note the red and green colours and the Allen key type bolts that can be difficult to remove.

hence the colour coding. The valves are held into the pump by two heavy duty Allen screws each and were eventually freed by using an heavy duty Allen key type bit that fitted into an impact wrench set, with an extension tube to give him some leverage. This did the trick and the screws finally gave in to the pressure.

An important thing to watch out for is that the valve seats have two O-rings. These O-rings must be replaced and refitted into the valve seats; Ryan lubricated them when fitting them back, before the new valves were fitted back onto the pump.

Another observation is that you will lose a small amount of fuel when doing this job, so protect the immediate area of the pump with some old cloth to soak up the diesel that comes out and you will not make a mess on the rest of the engine or the garage floor. We also thought it would be worth fitting a new fuel filter, and so we did.

When Ryan completed the work, he then re-set the Toyota RAV 4 engine diagnostic trouble codes , with our engine diagnostic machine and it then only took a couple of attempts to re start the engine, because there would have been a little trapped air in the system from when the valves were removed. If you are doing this job at home on your own one of these vehicles, we do recommend that you keep everything as clean as possible and do not let any dirt or other contamination onto the new valves.

The job only took about an hour including the ordering of the parts and the car was road tested and found to be cured of the problem. Our lady customer picked up the Toyota RAV 4 paid us and went on her way a happy customer.

This problem can also be found on the following Toyota models

Toyota Avensis 2.0 D-4D (CDT220) 1999>2003,Toyota Avensis Verso 2.0D-4D (CLM20) 2001>2005,Toyota Corolla 2.0 D-4D (CDE110) 2000>2001,Toyota Corolla Verso 2.0 D-4D (CDE120) 001>2004,Toyota Corolla 2.0 D-4D (CDE120) 2001>2007 (90bhp & 109bhp),Toyota Previa 2.0 D-4D (CLR30) 2001>2007. This information is from Blue Print. More information… http://www.blueprint-adl.com/newweb/technotes/INF118%2001%20Toyota%20Suction%20Valves.pdf

Toyota RAV 4

The new set of SCV valves ready to be fitted ,note the new sealing rings.

Pellon Tyre and Auto-centre offer car and van servicing and repairs to all makes of vehicles. We are members of Unipart Car Care centres and give a nationwide guarantee for all our work and parts. We also sell New Economy Tyres online from our website www.pellontyres.co.uk by using the tyre selector and choosing your tyre size. We offer courtesy cars to local motorists who need to go to work and leave their car with us for work doing. We are also an official MOT testing station and are members of Motor-codes, who carry out checks for high standard of equipment and workmanship.