Tool Required VB-FIX Required

Printpartsummary
Symptoms:
  • Burnt TCC apply components
  • Bushing wear
  • Overheated transmission
  • TCC apply & release concerns
Cause:

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.

Correction:

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

Tool Required VB-FIX Required

A340E, A340H

Oversized Secondary Pressure Regulator Valve Kit

Part No.

97741-17K

Oversized Secondary  Pressure Regulator  Valve Kit
  • 97741-17k_combo

  • Oversized Secondary  Pressure Regulator  Valve Kit

  • 97741-17k_fig1

Small_97741-17k_combo Small_97741-17k Small_97741-17k_fig1

A340E, A340H

Oversized Secondary Pressure Regulator Valve Kit

Part No. 97741-17K

  • Valve
  • End Plug
  • O-Rings (2) 1 extra

Complaint:

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

Cause:

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.


Correction:

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

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

Required Tools

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).

  • Test Locations

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Related Tech Articles

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