Range Rover. Manual — part 153
ZF AUTO
13
DESCRIPTION AND OPERATION
Fluid Cooler
1. Outlet connection
2. Fixing bracket
3. Inlet connection
4. Fixing bracket
5. Temperature sensor
Transmission fluid from the gearbox is circulated
through a cooler located at the front of the radiator.
Fluid lines from the transmission are connected to
each end tank of the fluid cooler. A temperature
sensor on the LH end tank provides the instrument
pack with an input of transmission fluid temperature. If
the temperature exceeds between 120 and 130
°
C
(248
°
F and 266
°
F), the instrument pack message
centre displays ’GEARBOX OVRHEAT’. The message
remains displayed until the temperature of the fluid
returns to between 82 and 88
°
C (180
°
F and 190
°
F).
EAT ECU
The EAT ECU operates the solenoid valves in the
gearbox to provide automatic control of gear shifts
and torque converter lock-up. The EAT ECU is
attached to a bracket which is secured to the cabin
floor below the LH front seat.
Diesel vehicles from 95MY and petrol vehicles up
to 99MY
A 55 pin connector links the EAT ECU to the vehicle
wiring. Software in the ECU monitors hard wired
inputs and exchanges information via hard wired
connections with the ECM, BeCM and instrument
pack.
Petrol vehicles from 99MY
A 75 pin connector links the EAT ECU to the vehicle
wiring. Software in the EAT ECU monitors hard wired
inputs and exchanges information with the ECM on a
Controller Area Network (CAN) bus to determine gear
shift and torque converter lock-up requirements.
Resultant control signals are then output to the
gearbox solenoid valves.
44
AUTOMATIC GEARBOX
NEW RANGE ROVER
14
DESCRIPTION AND OPERATION
The CAN bus, introduced on 99MY petrol vehicles,
provides the communication link between the ECM
and the EAT ECU. Inputs and outputs to and from
each control unit are transmitted via two twisted wire
connections, CAN high and CAN low.
The CAN bus allows more engine data to be passed
to the EAT ECU which, on earlier vehicles, would
require a number of additional hardwired connections.
The additional engine data is used by the EAT ECU to
give improved transmission quality and allows the
EAT ECU to operate in a greater number of default
modes in the event of sensor failure. Inputs and
outputs on the CAN communication bus are listed in
the table that follows.
CAN communications between EAT ECU and ECM - Petrol vehicles from 99MY
Inputs from ECM
Outputs to ECM
CAN version identifier
Calculated gear
Emissions (OBDll) control
Diagnostic information
Engine air intake temperature
Emission (OBDll) fault status
Engine speed
Engine torque reduction request
Engine speed fault flag
Gear position switch information
Engine temperature
Output shaft speed
Engine torque
Mode information
Engine torque fault flag
Shift information
Friction torque
Torque converter lock-up solenoid
Maximum engine torque
Reduced engine torque
Road speed
Status of engine speed torque reduction
Throttle position
ZF AUTO
15
DESCRIPTION AND OPERATION
EAT ECU connector - Diesel vehicles from 95MY and petrol vehicles up to 99MY
EAT ECU connector pin details - Diesel vehicles from 95MY
and petrol vehicles up to 99MY
Pin No.
Description
Input/Output
1
Ignition supply
Input
2
Vehicle speed sensor (positive)
Input
3
Engine speed
Input
4
Not used
-
5
Shift control solenoid valve (MV1)
Output
6
Pressure regulator solenoid valve (MV4)
-
7
Electronics earth
-
8 to 13
Not used
-
14
Gear position switch, Y contacts
Input
15
Diagnostics, L line
Input/Output
16
MES 1 - message centre display
Output
17/18
Not used
-
19
Solenoid valves power supply
Output
20
Earth (screen)
21
Engine torque PWM
Input
22/23
Not used
-
24
Shift control solenoid valve (MV2)
Output
25
Not used
-
44
AUTOMATIC GEARBOX
NEW RANGE ROVER
16
DESCRIPTION AND OPERATION
EAT ECU connector pin details - Diesel vehicles from 95MY
and petrol vehicles up to 99MY (continued)
Pin No.
Description
Input/Output
26
Power earth
-
27/28
Not used
-
29
Mode switch
Input
31
MES 2 - message centre display
Output
30
Not used
-
32
Torque reduction request
Output
33
Gear position switch, Z contacts
Input
34 to 37
Not used
-
38
Vehicle speed sensor (negative)
Input
39
Battery supply
Input
40/41
Not used
-
42
Torque converter solenoid (MV3)
Output
43 to 45
Not used
-
46
Transmission high/low switch
Input
47
Throttle position PWM
Input
48/49
Not used
-
50
Gear position switch, X contacts
Input
51
Diagnostics, K line
Input/Output
51 to 55
Not used
-
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