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:
Shock Absorber and Spring Assembly - [+] Air Suspension
REMOVAL AND INSTALLATION
SPECIAL TOOL(S)
JLR-204-802
Splitter, Damper
GENERAL EQUIPMENT
PART(S)
REMOVAL
WARNING:
Residual air pressure may be present in the system. Take care when releasing air
line connectors.
CAUTION:
Before disconnecting any components, make sure the area is clean and free fr
Preliminary Advice, Jacking
PRELIMINARY ADVICE
WARNING:
Make sure that the vehicle is stable before completing any work.
CAUTION:
Make sure the deployable side steps are set to 'Roof Access' mode (if equipped).
Do not jack or lift on the
side step mount brackets.
NOTES:
There is some variation in the illustrations depending
