626 LX L4-2.0L DOHC (1999)
TORQUE CONVERTER CLUTCH (TCC) HYDRAULIC CIRCUIT
The PCM varies the pulse-width (ON time) of the electrical signal to the TCC solenoid in order to vary pressure in the S4 hydraulic circuit. The
following principles of operations apply for the TCC solenoid:
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At low pulse-width, S4 circuit pressure is lower, resulting in release of the torque converter clutch.
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At high pulse-width, S4 circuit pressure is higher, resulting in apply of the torque converter clutch.
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At moderate and varying pulse-width, S4 circuit pressure is varying, resulting in controlled slip of the torque converter clutch.
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In fail-safe mode, (no pulse-width), no S4 circuit pressure is present, resulting in the release of the torque converter clutch.