TCC Hydraulic Circuit

The Torque Converter Clutch (TCC) circuit cannot be checked reliably using air with the exception of checking for a missing input shaft check ball (4) or checking for a leaking Teflon seal that separates lube from TCC disable (5).
To check for a missing input shaft check ball (4) or a leaking Teflon seal that separates lube from TCC disable (5), regulate air pressure to 25 psi. Apply air to the lube pressure port (next to TCC apply) and look for a significant amount of air coming from TCC disable or converter out ports.

NOTICE: When applying air to the lube pressure port, a small amount of leakage will normally be observed coming from TCC disable and/or converter out. If a gross leak is observed, inspect for a missing input shaft check ball (4) or leaking Teflon seal that separates lube from TCC disable (5).

Other sources of leaking in the TCC circuit, which cannot be detected with an air check include:
- Damaged input shaft seal ring(s) between TCC disable and lube or converter out (1), (5).
- Damaged input shaft to converter O-ring (2).
- Damaged O-ring on torque converter (3).