Jaguar AJV8 engine / 5HP24 transmission. Manual - part 16

AJ-V8/5HP24

Transmission

Introduction

The new ZF 5HP24 automatic transmission system features five forward gears and one reverse gear.
It also features a filled-for-life oil system. Gearshift management is achieved using a Transmission
Control Module (TCM).

TRANSMISSION

Rotary Switch Connector

Rotary Switch and Oil Inlet Pipe

Oil Outlet Pipe and Selector Cable

Level/Filler Plug

307-012

AJ-V8/5HP24

Transmission

Tecnical Data

Transmission weight
including fluid and
torque converter

95.8 kg (211 lbs)

Oil Type

ATF Esso LT71141

Oil Capacity

10 liters (2.645 US. gals)

Gear Ratios

1st Gear

3.571:1

2nd Gear

2.202:1

3rd Gear

1.505:1

4th Gear

1.000:1

5th Gear

0.803:1

Reverse

4.095:1

Gearshifting

Driver gear selection is transmitted from the gear
selector lever by cable to a lever fitted to a
selector shaft in the transmission casing. This
shaft moves the manual valve and the rotary
switch. The rotary switch signals all gear
positions except D to 4. A separate switch in the
driver gear selector mechanism detects
movement of the selector between D and 4. The
communication of driver gear selection to the
TCM is made by the rotary switch. Gear shift
points are selected by the TCM in response to
output speed, engine load, selector position,
accelerator pedal position and driver mode
selection. Driver control of the shifting is via the
selector lever, throttle pedal position, kickdown
switch and mode switch. Two shift modes are
available, sport and normal, controlled by the
driver from a switch on the gear selector
surround. During kickdown, gear upshifts occur at
6800 RPM engine speed.

Mechanical Description

The unit is an oil filled-for-life system therefore no
dipstick is fitted to the transmission. A filling/level
plug is located at the right-hand side rear of the
casing for service oil level checking and
replenishment, if required. To achieve effective
cooling, the oil is pumped from the transmission
casing at the front left-hand side of the casing to
the car mounted oil cooler. The oil is returned
from the cooler to the inlet connection on the
front right-hand side of the casing. The cooler is a
plate-type design made from aluminum and is
located in the car radiator outlet tank. To detect
changes in oil viscosity which occur as the oil
temperature changes, an oil temperature sensor
is located in the unit casing sump. Also located

in the transmission casing are the input shaft
speed sensor (turbine speed) and output shaft
speed sensor (vehicle speed). The torque
converter is a lightweight unit which, because of
its low mass, improves engine responsiveness.
The torque converter bell housing is bolted to the
transmission casing. Mounting of the
transmission is conventional by bolting the torque
converter bell housing to the engine. The rear
extension housing is bolted to the transmission
casing and forms the rear engine/transmission
mounting point. It also carries the output shaft oil
seal.
The electro-hydraulic module contains three
solenoid valves and five pressure regulators for
gear shifting. Each of the three solenoid valves
control the flow of transmission fluid to the
selected clutches. One pressure regulator serves
as master pressure control for the entire system
and one is used exclusively for torque converter
clutch lock-up operation.
Replacement transmission units are shipped
complete with the torque converter and housing,
extension housing, coupling flange and rotary
position switch. They are also fully filled with
10 liters (2.645 US. gals) of oil. Consequently,
when undertaking a transmission replacement,
oil replenishment should not be necessary. The
exterior of the transmission is coated with a non-
drip corrosion protection oil, which must not be

AJ-V8/5HP24

Transmission

Electrical Description

EM046

BLACK

mistaken for an oil leak.

Electrical Connections

Bayonet Connector
A round, 16-pin, bayonet electrical connector is
fitted at the rear left-hand side of the
transmission which communicates with the 5
pressure regulators, 3 shift solenoids, oil
temperature sensor and the input and output

Connector/
Pin

Circuit

Pin

Circuit

Pin

Circuit

shaft speed sensors.
EM046
001

Output Speed Sensor (+)

002

Pressure Regulator 1

003

Pressure Regulator 2

004

Shift Solenoid Valve 3

005

Turbine Speed Sensor (+)

006

Turbine Speed Sensor (-)

007

Pressure Regulator 3

008

Shift Solenoid 1

009

Shift Solenoid 2

010

Output Speed Sensor (-)

011

Pressure Regulator 4

012

Solenoid Valves (+)

013

Analog Ground

014

Oil Temperature Sensor

015

Pressure Regulator 5

016

Regulator (+)

Rotary Switch Connector
The rotary switch, mounted on the right-hand
side of the casing, has a spline arrangement
which prevents misalignment with the selector
shaft. A locating pin and two bolts secure the
rotary switch to the transmission casing. This
locates the switch with the transmission casing
and the shaft in one place only. The switch
requires no other setting up procedure.
A 10-way connector with flying lead connects the
rotary switch to the engine management
harness. The connector is retained on a multi-
connector bracket bolted to the transmission
casing/torque converter housing joint.

BLACK

EM047

F G

J K

SOCKET

Connector/
Pin

Circuit

Pin

Circuit

Pin

Circuit

EMO47
00A

Position L1

00B

Position L2

00C

Position L3

00D

Position L4

00E

Digital Ground

00F

Not Used

00G

Not Used

00H

Not Used

00J

12V Power Supply

00K

Park & Neutral Switch

EM 046

BAYONET CONNECTOR

EM 047

ROTARY SWITCH CONNECTOR

307-024

307-023

AJ-V8/5HP24

Transmission Management

The transmission management system uses both
analogue and digital signals, to control the
operation of the transmission. Digital signals are
processed by the TCM to and from the vehicle
multiplex network. Other input/output analogue
signals are hardwired to the TCM. This
information is used primarily by the TCM to
decide which shift program to implement, which
gear to select and for shift energy management.
If a fault occurs, the TCM will take default action
and inform the driver via the Message Centre and
amber warning light.

Harness Connector

The vehicle harness connector for the TCM is an
88-way latching connector. The TCM is wired to
the electrical pressure regulators/solenoids, oil
temperature sensor and shaft speed sensors in
the transmission casing.

Sport Mode

When sport mode is selected by the driver using
the mode switch, the sport pattern is only
activated when a set cornering force is achieved,
or the kickdown switch is pressed. The vehicle
speed and the difference in speeds between the
two front wheels is used to calculate the amount
of cornering force.

Torque Convertor Lock-up

The torque convertor lock-up clutch is engaged
as a function of throttle position, output speed,
oil temperature, gear shift and shift program.
Lockup is possible in 2nd, 3rd, 4th and 5th gears
but is usually restricted to 4th and 5th gears.
During a gear shift the TCM controls the amount
of slip of the lock-up clutch to enhance shift
quality.

Oil Temperature

When the engine coolant or transmission oil
temperature exceeds set thresholds a hot mode
program is selected which locks the torque
convertor clutch, minimising the amount of heat
entering the engine cooling system from the
transmission oil.

TCM

303-009

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