U151E Pump 2005

This listing is for owners of a 2005-or-newer Toyota or Lexus whose five-speed automatic has started to lag going into gear, flare under throttle, or sing with a pump whine at idle. It is a good used OEM oil pump assembly described for the 2005-up U151E behind the 3.5L V6 and the U250E behind the 2.4L four-cylinder, with gears measuring .460 inch thick.

How the pump works in the 2005-up U151E

Every hydraulic job in this transaxle starts at the front pump. The torque converter hub keys into the inner drive gear, the outer driven gear runs eccentric to it, and oil is carried from the suction side to the pressure side as the teeth unmesh and remesh. That volume feeds the primary regulator, the SLT-controlled line pressure circuit, converter charge and the lube circuit. Pump wear does not cause one bad shift; it starves everything a little, which is why the symptoms tend to arrive together and get worse as the fluid heats up and thins.

Symptoms that point to this part

• A two- or three-second pause before Drive or Reverse engages, especially on the first start of the day
• Slipping on every upshift once the fluid is hot, with the engine flaring between gears
• Pump whine that changes with engine RPM in Park, not with vehicle speed
• Dark or burnt-smelling WS fluid with fine metallic glitter in the pan
• A P2714 SLT performance code when the computer commands pressure the unit never reaches

Confirm it before ordering

A pressure gauge settles the question faster than parts swapping. Low line pressure in both Drive and Reverse at idle and at stall points at supply: the pump, its bushing, or a stuck pressure regulator. Our guide to checking transmission line pressure covers the procedure, and our Aisin slipping-under-load article helps separate pressure loss from worn clutches. With the old pump on the bench, Toyota publishes maximum clearances of 0.17 mm between the driven gear and body, 0.15 mm gear tip to tip, and 0.05 mm side clearance. Toyota also sizes these gears in thickness grades from 11.690 to 11.740 mm, which lines up with the .460 inch gear thickness on this unit.

Fitment for this 2005-up pump

The pump is described for 2005-and-later Toyota vehicles with the 2.4L four-cylinder and U250E, or the 3.5L V6 and U151E. On the V6 side that takes in the 2005-2007 Avalon, 2007-2010 Sienna, 2008-2013 Highlander, the 2006-2012 RAV4 V6 and the 2007-2009 Lexus RX350. On the four-cylinder side the U250E was used in the 2005-2009 Camry and 2006-2009 Solara. Earlier 3.0L and 3.3L units are not part of this listing's description; for those, see the crescent-style U151E/U151F pump. The listing references Toyota numbers 35035-08010 and 35370-06010, so compare those against the tags on your pump body and stator, or send us your year and VIN and we will check it. More Toyota/Aisin parts are on the Aisin transmission parts page.

Install notes

• Press in a new front seal and fit a new body O-ring lubricated with ATF; a pinched O-ring leaks pressure back to the sump.
• Fit new clutch drum seal rings on the stator shaft and keep their ends from over-spreading.
• Check the converter hub where it rides in the pump bushing; Toyota's limit for the body bushing is 38.188 mm inside diameter.
• Pre-fill the pump with Toyota WS fluid and set the level hot. Genuine Toyota ATF WS is the correct fluid for both transaxles.

A pump that has worn this far usually took the clutch packs and valve body with it. Plan on an overhaul kit if the frictions are burnt, and if the bores are scored, a replacement U151E valve body restores pressure control. After the job, reset the adaptive values with a scan tool and let the unit relearn over several gentle drives.

Does this fit my 2004 Sienna or Highlander with the 3.3L?

This pump is described for 2005-up 2.4L and 3.5L applications. The 3.3L V6 units are not named in its description, so for those look at our crescent-style U151E/U151F pump, or send us your VIN and we will check.

Is it really the same pump for the U151E and the U250E?

It is described for both the 2005-up U151E and the U250E. Compare the Toyota numbers on the listing (35035-08010 and 35370-06010) and the gear style in the photos with your own unit before ordering.

What does the .460 inch gear thickness mean?

Toyota grades these pump gears by thickness between 11.690 and 11.740 mm (about .460 to .462 inch). Matching thickness keeps side clearance inside the 0.05 mm limit, which is what holds pressure at idle.

Which fluid should I use after installing it?

Toyota ATF WS. Do not mix in older Type T-IV fluid. Fill, run through the gears, and set the level at operating temperature.

Should I replace the torque converter at the same time?

Only if the hub is scored or the converter is contaminated. A grooved hub destroys the pump bushing and front seal quickly, so inspect it closely; if the old pump failed with debris in the fluid, flush or replace the converter and the cooler lines.

• How to Check Transmission Line Pressure With a Gauge
• Aisin slipping under load
• Converter hub and pump bushing wear
• Adaptive relearn after a valve body or rebuild