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  • Overheated transmission
  • Burnt TCC apply components
  • Bushing wear
  • TCC apply & release concerns


Oscillation of the steel secondary pressure regulator valve within the aluminum casting causes wear, which will allow converter feed oil to leak to exhaust and not supply the lube circuit, resulting in converter complaints, burnt apply components and lube-related failures.


Restore proper hydraulic control by refurbishing the bore and replacing worn valve with the oversized Sonnax valve kit.

A340E, A340H

Oversized Secondary Pressure Regulator Valve Kit
Part No. 97741-17K

You need this if... View Instructions

In Toyota A340E/H Early (Type 1) units (Figure 1), the secondary pressure regulator valve receives regulated line fluid pressure from the main pressure regulator valve and routes it to the converter and lubrication circuits. The continual oscillation of the steel valve within the cast aluminum sleeve creates wear, allowing this valuable fluid pressure to exhaust and resulting in converter complaints, burnt apply components and lube-related failures. Sonnax oversized secondary pressure regulator valve kit 97741-17K restores proper hydraulic clearance and includes an O-ringed end plug to positively seal the balance pressure circuit.

  • Valve is hardcoat anodized to reduce wear
  • O-Ringed end plug positively seals the balance pressure circuit
  • Valve
  • End Plug
  • O-Rings (2) 1 extra

January 16, 2014

Toyota A340E/F Identification Guide

Topics: Identification Guides Transmission Toyota/Lexus A340E Transmission A340F Transmission

Read Now

September 30, 2005

Anatomy of a Transmission: Oil Flow in the Pump-PR-Converter-Cooler Lube Circuits

Gregg Nader

Topics: Diagnostics And Theory Transmission

Read Now
  • 97741 17k combo
  • 97741 17k
  • 97741 17k fig1

You need this if...

Vacuum tests at the ports indicated fail to hold at least 18 in-Hg, or if visual wear is detected in the bore (Figure 2).

  • 97741 17k test