Question about Toyota RAV4

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Step motor for turbo control system

Car drives fine on short journeys but on motorway after several miles sudden loss of power. ignition off and back on and it seems to reset. fault code p1251 step motor control system

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DOES ANYONE KNOW THE DIFFERENCE BETWEEN A TURBO BOOST CONTROL SOLENOID AND A EGR VALVE, IT DOES NOT SOUND LIKE IT BY READING THE THREADS HERE !
The code p1251 relates to the actuator motor and circuit associated with the boost control, i.e. the motor that changes the angle of the valves to divert exhaust pressure to and from the turbine of the turbocharger and consequently control the boost pressure. And the fact the code indicates a circuit problem is pointing towards a component, module or wiring issue..

Posted on Feb 08, 2017

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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j_del
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SOURCE: Saab 9-3 turbo problem!

Sounds like the recirculation valve (aka diverter valve) is failing. A lot of turbo cars that have them end up with failures from them, since they're usually cheaply made from plastic, and the diaphragms inside don't hold up over time.

What the valve does is, when you shift, there is a backsurge of boost air that hits the closed throttle plate. The diverter valve (DV) opens and dumps the air back into the intake piping. It's kept closed during acceleration by spring and manifold pressure. When you shift, the pressure drops on the backside of the valve and it opens, venting the excess boost air. If your valve is failing, just the pressure of boost in the intake piping could be pushing it open, causing the acceleration to slow. I'd look into a replacement diverter/recirculation valve.

Posted on Jul 31, 2008

freetek
  • 5568 Answers

SOURCE: power loss

Can't answer your last question but catalytic convertors that are just not working anymore won't cause any loss of power. However, if they have shattered inside (they are kind of a ceramic honeycomb) they can dump junk into the exhaust system that can eventually clog your muffler or resonator.
Checking whether this has happened isn't difficult; after the warm up of the engine, either you or a helper needs to listen to the exhaust note. If firing of the cylinders is still distinct, the system isn't clogged with shrapnel; if it seems to hiss at higher RPMs, it is likely clogged.
This effect is easy to miss; I've had two failures and when cold, the engine would pull fine because the chunks of ceramic would fall to the bottom of the muffler and glue together somewhat. Once hot and agitated, they would clog the muffler and cause a severe loss of power but the idle would be OK. A hill that I would normally pull at 70 MPH, I couldn't top at all; had to sit and wait for things to cool down before proceeding.
It also seems some engines appreciate a bit of back-pressure in the exhaust system because the car gained in mileage and pulling power for several thousand miles before the clog became critical causing the mileage to fall sharply along with the power.  

Posted on May 23, 2009

stanley141
  • 124 Answers

SOURCE: ENGINE MANAGEMENT LIGHT FOR PRE-HEATER AND INJECTION

this clearly incates that your fuel filter is block renew it on every 10000km`s

Posted on Jul 21, 2009

  • 11 Answers

SOURCE: Sparks and eventually flames out the exhaust when

Oil has probably gone in to your Exhaust, this is common when a turbo fails.

Usually just let it burn out..... drive the car so that there is pressure in the exhaust and it should not do any harm to the car....

Posted on Aug 30, 2009

  • 1201 Answers

SOURCE: fault code p0245 puegoet 406 turbo fault

My book shows that P0245 is the super/turbo charger solenoid "A" voltage is low.

Posted on Sep 29, 2009

Testimonial: "cheers for that x18wheeler60 thought it was low pressure not voltage,dont suppose you no which selonoid might be causing this nightmare."

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