Description And Operation: Introduction

The ZF 6HP28 transmission is an electronically controlled, hydraulically operated, six speed automatic unit. The hydraulic and electronic control elements of the transmission, including the TCM (transmission control module), are incorporated in a single unit located inside the transmission and is known as 'Mechatronic'.

On SC (supercharger) models, the transmission used is an uprated derivative of the ZF 6HP28 transmission used in the 5.0L naturally aspirated models.

The ZF 6HP28 transmission has the following features:

• Designed to be maintenance free
• Transmission fluid is 'fill for life'
• The torque converter features a controlled slip feature with electronically regulated control of lock-up, creating a smooth transition to the fully locked condition
• Shift programs controlled by the TCM
• Electronic park lock, controlled by the TCM, with a mechanical emergency release
• ASIS (adaptive shift strategy), to provide continuous adaptation of shift changes to suit the driving style of the driver, which can vary from sporting to economical.
• Connected to the ECM (engine control module) via the high speed CAN (controller area network) bus for communications
• Default mode if major faults occur
• Diagnostics available from the TCM via the high speed CAN bus.

The transmission selections are made using the rotary JaguarDrive selector in the floor console and two paddle switches on the steering wheel.

For additional information, refer to: External Controls (Description and Operation).