Land Rover Defender: Component Location, Overview
COMPONENT LOCATION
COMPONENT LOCATION - 1 OF 2 - AUTOMATIC TRANSMISSION
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- Automatic Transmission Fluid (ATF) cooler
- ATF cooler pipes
- Emergency Park Release (EPR) lever
- Automatic transmission
COMPONENT LOCATION - 2 OF 2 - TRANSMISSION CONTROL
NOTE: Right Hand Drive (RHD) variant shown, Left Hand Drive (LHD) variant is similar.
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- 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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Description
TRANSMISSION
The transmission comprises the main casing which houses all of the
transmission components. The main casing also
incorporates an integral torque converter housing.
A fluid pan is attache
Operation
POWER FLOWS
Operation of the transmission is controlled by the TCM, which electrically
activates various solenoids to control the
transmission gear selection. The sequence of solenoid activation is b
Diagnostics - Vehicles With: 8HP45 8-Speed Automatic Transmission AWD
DIAGNOSIS AND TESTING
PRINCIPLE OF OPERATION
For a detailed description of the automatic transmission/transaxle system and
operation, refer to the relevant
Description and Operation sections in the w
SEE MORE:
Diesel Fuel System Health and Safety Precautions
DESCRIPTION AND OPERATION
WARNINGS:
Fuel may not give adequate warning before toxic or harmful effects
arise.
Exposure to fuel can be harmful and can cause severe health damage or
death.
Provide adequate ventilation when working on fuel systems.
Extreme care must be exercised when handling
Commute mode
Make sure the relevant safety warnings
have been read and understood before
operating the navigation system.
Commute mode allows for the navigation
system to learn regular commutes and
automatically advises the user of the
expected journey time based on live and
historical traffic movements without
