Symptoms:

  • Inadequate lubrication
  • Overheating
  • TCC apply & release concerns
  • TCC codes

Cause:

Excess wear in the lockup relay and plunger valve bores allows pressure loss and causes valve sticking that leads to TCC and lubrication failures.

Correction:

Recover hydraulic control and renew TCC and lube operation by installing Sonnax oversized lockup relay valve kit.

U341E, U341F

Oversized Lockup Relay Valve Kit
Part No. 37740-11K


You need this if... View Instructions Find a Distributor

Toyota/Lexus U341E and U341F lockup relay valve trains route converter feed fluid to the release side of the converter clutch, and apply fluid into the cooler circuit. Converter feed pressure at the lockup relay control plunger valve helps in positioning of the outboard lockup relay valve. Wear or sticking at either the relay or plunger valve bores can result in converter apply and release concerns, inadequate lubrication, overheated fluid and converter codes. Installing Sonnax oversized lockup relay valve kit 33740-11K restores critical clearances for renewed TCC control and operation.

  • Hardcoat anodized aluminum valve combats premature wear
  • Annular grooves provide centering

There are two reaming processes. The plunger (inner) valve bore must be reamed first as the bench reamer jig needs to install into the OE relay valve bore. If the ouboard relay valve bore is reamed first the bench tooling will not work.

  • Relay Valve
  • Plunger Valve
  • Spring
  • End Plug

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.

Toyota/Lexus U341E/F Valve Body Layout

Toyota/Lexus U341E/F Valve Body Layout
  • U341E, U341F Oversized Lockup Relay Valve Kit 37740-11K
  • U341E, U341F Oversized Lockup Relay Valve Kit 37740-11K

You need this if...

Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.

U341E, U341F Oversized Lockup Relay Valve Kit Vacuum Test Locations