Land Rover Defender: Component Location, Overview

COMPONENT LOCATION

COMPONENT LOCATION - 1 OF 2 - AUTOMATIC TRANSMISSION

1. Automatic Transmission Fluid (ATF) cooler
2. ATF cooler pipes
3. Emergency Park Release (EPR) lever
4. Automatic transmission

COMPONENT LOCATION - 2 OF 2 - TRANSMISSION CONTROL

NOTE: Right Hand Drive (RHD) variant shown, Left Hand Drive (LHD) variant is similar.

1. Transmission Control Switch (TCS)

OVERVIEW

The 8HP70 transmission is an electronically controlled, hydraulically operated, 8 speed automatic unit.

A single unit known as the mechatronic valve block is located inside the transmission.

The mechatronic valve block contains the following control components:

• Hydraulic control elements
• Electronic control elements
• The Transmission Control Module (TCM).

The 8HP70 transmission has the following features:

• Designed to be maintenance free.
• The ATF 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.
• Adaptive Shift Strategy (ASIS), to provide continuous adaption of shift changes to suit the driving style of the driver, which can vary from sporting to economical.
• Connected to the Powertrain Control Module (PCM) through the FlexRay systems bus for communications.
• Default mode if major faults occur
• Diagnostics available from the TCM through the FlexRay systems bus.

The transmission selections are made using the TCS in the floor console.

On vehicles featured with the stop/start system, the 8HP70 automatic transmission is equipped with a Hydraulic Impulse Storage (HIS) device. The HIS ensures pressurized ATF is available to the shift elements as quickly as possible when the engine is started.

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