Mazda CX-5 Service & Repair Manual: Torque Converter Clutch (TCC) Control [Fw6 A EL, Fw6 Ax EL]

Mazda CX-5 Service & Repair Manual / Drivetrain / Transmission/Transaxle / Automatic / Torque Converter Clutch (TCC) Control [Fw6 A EL, Fw6 Ax EL]

Outline

For TCC control, a newly developed, full range TCC control has been adopted. The TCC range has been significantly widened by having the smoothness unique to the torque converter during acceleration from a stop take precedence and actively controlling TCC directly after acceleration from a stop. Therefore, a contribution to low fuel consumption and vehicle operability with a direct feel have been achieved.
Lower fuel consumption and improved emission performance have been achieved by performing the TCC control during deceleration with the accelerator pedal fully closed and by fuel-cut during TCC.

Construction

The TCC mechanism consists of a torque converter clutch, TCC piston, and a damper which are installed inside the torque converter.
A multi-plate type torque converter clutch has been adopted for improved durability. Also, by reducing the size of the clutch diameter, improved handling is achieved by the ability to respond to the precise control by the full range TCC.
Vibration during TCC engagement is suppressed by the improved damper performance.

Operation

TCC engagement

A current signal is sent from the TCM to the TCC control solenoid during TCC engagement. At the same time, the TCC piston engagement pressure is gradually increased.
As a result, the TCC piston is pressure-bonded to the TCC clutch slowly to perform smooth TCC engagement.

TCC release

A current signal is sent from the TCM to the TCC control solenoid during TCC release. At the same time, the TCC piston engagement pressure is gradually drained.
As a result, the TCC piston releases the TCC clutch slowly to release the TCC smoothly.

Inhibition of TCC control

If any one of the following conditions is met, the torque converter clutch control is inhibited.

TCC solenoid malfunction
ATF temperature is specification or less
Engine speed signal is specification or less
Turbine shaft speed is specification or less
Other than D/M position

Torque Converter Clutch (TCC) Control Solenoid [Fw6 A EL, Fw6 Ax EL]

Purpose/Function The torque converter clutch (TCC) control solenoid adjusts the hydraulic pressure in the TCC control circuit based on the current demand from the TCM according to the veh ...

Torque Converter [Fw6 A EL, Fw6 Ax EL]

Purpose/Function By use of an optimized torus shape (wing) matching the output characteristics of the engine, the torque converter achieves efficient force transmission and reduced fuel c ...

Other materials:

Lights On Indicator Light
Purpose Notifies the user that the TNS or the headlights (LO) are on. Function Illuminates when the illumination conditions for the TNS, headlights (LO), or parking lights are met. When the instrument cluster receives the TNS malfunction signal sent via CAN communic ...

Precaution
Intermittent Concern Troubleshooting Vibration method If a malfunction occurs or becomes worse while driving on a rough road or when the engine is vibrating, perform the following steps. NOTE: There are several reasons why vehicle or engine vibration could cause an electr ...

Positive Crankcase Ventilation (PCV) System
Purpose, Outline Prevents release of blow-by gas (unburnt gas) into the atmosphere. The intake manifold vacuum introduces blow-by gas to the intake manifold via the PCV valve and the ventilation hose. System Diagram Structure The positive crankcase ventilation sys ...