Converter Clutch Applied

Overdrive Range - Third Gear (TCC Applied):

OVERDRIVE RANGE - THIRD GEAR (CONVERTER CLUTCH APPLIED)

"A" SHIFT SOLENOID - OFF
SECOND CLUTCH - APPLIED
1/2 SUPPORT ROLLER CLUTCH - OVERRUNNING
"B" SHIFT SOLENOID - OFF
THIRD CLUTCH - APPLIED
FORWARD BAND - APPLIED
*PWM SOLENOID - ON
THIRD ROLLER CLUTCH - HOLDING
TCC SOLENOID - ON

The [1][2]torque converter clutch applies during third gear operation after the PCM receives appropriate input signals from the VS Sensor, TP Sensor and engine temperature sensor. When the proper vehicle operating conditions have been met, the "on/off" converter clutch solenoid (315) [some models and the "pulse width modulated" (PWM) solenoid (325)] is "energized". The PWM solenoid duty cycle is "ramped" between 0 and 100% to regulate PWM fluid pressure to the converter clutch regulator valve (330). Regulated apply pressure is then sent to the converter clutch valve (335) into the apply passage. Apply fluid seats the No. 1 checkball (372) against release fluid and applies the converter clutch. Apply fluid is also at the torque converter blow off valve (417-20) to exhaust excess fluid pressure. Converter feed fluid at the converter clutch valve (335) is allowed to feed into the cooler passage, through the cooler check valve (28), through the cooler and into the lube system of the transaxle.

PWM Solenoid (325): Controlled by the PCM, it modifies the PWM duty cycle to vary the feed pressure in the PWM fluid passage to the converter clutch regulator valve (330). This arrangement provides for accurate control of the regulated converter clutch apply (and release) pressure.

Converter Clutch Regulator Valve (330): Provides regulated apply fluid to the converter clutch valve (335) into the apply fluid passage.

Converter Clutch Solenoid (315): When energized, [1][2]Torque Converter Clutch (TCC) signal fluid shifts the converter clutch valve (335) against spring pressure.

Converter Clutch Valve (335): When shifted, directs regulated apply fluid into the apply passage; converter feed fluid into the cooler passage and, allows converter release fluid to exhaust.

No. 1 Checkball (372): Located in the channel plate (400), blocks release fluid while sending apply fluid to the [1][2]torque converter clutch blow off valve (417-20).

Cooler Check Valve (28): Allows cooler fluid to pass through the cooler and provide lubrication for the transaxle. It also prevents converter drainback when the engine is off.

* PWM SOLENOID ON MOMENTARILY DURING APPLY WITH CHANGING DUTY CYCLE.