The pump flow valve is inside the pump assembly:
In the video where he talks about the valve and bore getting scored has to do with metal bits in old dirty fluid.
"The most expensive repair of CVT happens when the pressure in the system drops. The reason for this is the chips and coating of the pressure relief valve in the CVT pump.The
oil pump RE0F10A / JF011E is the most vulnerable part of the CVT. The cover of the pressure relief valve is torn off, the valve is jammed is in a hot state. Further, because of low pressure, the belt RE0F10A / JF011E is erased. The shavings from the
belt and the
pulleys get into the
valve body, and the car with the buzzing sound stops with the pressure errors in the pulleys. In this case, the
oil pump, CVT
belt and
valve body are replaced. If the pulleys are erased, the
set of pulleys is also replaced. "
and:
Detailed description of CVT jatco jf015e, typical faults and methods for their solution.
akppro.ru
Harmful Filings
A common complaint of the car owner is irregular motion, kicks at acceleration. There may be several reasons behind this kind behavior of a car. However, virtually all of them have to do with oil contamination with the pulley debris – metal chips or filings can create a variety of problems. There are magnets in the crankcase to mitigate harmful effects of these metal particles, they have to collect these particles but sometimes do not cope with the task.
This may cause various malfunctions. First of all, accelerated wear of the valve body leading to pressure fluctuations, which, in turn, make pulleys move, resulting in the fluctuations of transmission gear ratio and irregular motion of the car.
Normally, this also leads to shock at reduction gear range change (at an approximate speed of 30–45 km/h), as well as double or even triple range switching, that looks like engine revolution surges, reluctance to go back to lower range at braking, vibration at switches to lower range – all of these are consequences of "leaky" plate with significantly worn down body and valves. The valve body needs to be repaired and possibly even replaced.
Filings and chips also cause irregular wear or seizure of the oil pressure relief valve.
Pic.: Oil pressure relief valve and its matching bore with traces of scoring
This type of defect can occur fairly soon, in cars with not more than 30–40 thousand km on the odometer.
Unless the valve body is repaired or replaced in time, this will ultimately cause damage to pulleys and belt that will have to be replaced in this case. Pulleys are the most expensive unit of the CVT. They can be polished but in some cases only replacement can help.
Metal contaminants also block up pressure controllers, thus contributing to an accelerated wear of valves."
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This is why I've said to dump the factory fill at 30k miles, and clean out all the metal bits, then 30-50k change intervals depending on driving conditions, especially if you use factory fluid which is just Nissan NS2 and doesn't take heat and heavy use well as we have seen.
