Additional comments for consideration regarding the p0402 code.
Egr backpressure control valve.
The vent on the negative back pressure egr is normally close and when vacuum is applied to the diaphragm the pintles open.
This is usually caused by the egr backpressure control valve getting a burnt diaphragm from the exhaust.
Still you can follow this guide along with the procedure described in your vehicle manual to test your egr valve if necessary.
Fisher type 63eg pilot operated pressure relief valves may be used for both liquid and gas service type 63eg is also suitable for throttling backpressure or bypass applications.
Replacing the egr backpressure control valve.
The main valves in both constructions use quick change trim package for fast maintenance.
Later backpressure transducers were added to the egr valve control to further tailor egr flow to engine load conditions.
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The second diaphragm is connected through a hole in the pintle shaft to the exhaust side of the egr valve.
The diesel engine air system consists of intake and exhaust manifolds turbocharger charge air cooler cac egr circuit intake throttle it and exhaust back pressure valve ebp valve other air gas control valves and valvetrain.
For remote monitoring a position monitor bracket pmb is available for the type 63eg to mount the 4300 series wireless.
13 1 the goal of air system design is to achieve desirable air fuel ratio egr rate exhaust gas.
The negative back pressure egr valve uses two diaphragms to operate figure 51 18 the main diaphragm is connected to the pintle valve and is spring loaded just like the single diaphragm valve.
New vehicle models come with electronically controlled valves though about six different types of egr valve control configurations exist today and some late model cars have rid of the egr valve entirely.
It s vacuum and back pressure modulated a.
The egr system used on an 1994 toyota 4runner is the same as the camrys of the same vintage and it s a complex one.
Raise the egr valve to its maximum position and then let it suddenly snap back to a closed position.
Its relationship with other systems is shown in fig.
As the back pressure changes in the exhaust system the internal bleed is controlled which helps control the operation of the egr.
If the idle becomes smoother the egr valve may not be closing properly.
Code p0402 is triggered when the egr temperature sensor sees more of a temperature change than the egr has commanded to open.
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