Range Rover. Manual — part 156
ZF AUTO
25
DESCRIPTION AND OPERATION
Fault effects and warning indicators - Petrol vehicles from 99MY (continued)
Fault code
OBDll
(TestBook)
Fault description
Effect
MIL
Warning
lamp
’GEARBOX
FAULT’
message
P1843
(17)
* CAN time-out
monitoring
Maintains current gear in low range,
limp home mode in high range. Shift
pressure to maximum, harsh gear
shifts/engagement.
On
Yes
P1884
(11)
* CAN message:
Engine friction invalid
No apparent effect.
On
No
P1884
(18)
* CAN message:
Throttle position
invalid
Substitute throttle angle of 50%
adopted. No kickdown. Operates in
Economy mode only.
On
Yes
P1884
(19)
CAN message:
Engine temperature
invalid
Substitute engine temperature
derived from other inputs. No
apparent effect.
On
No
P1884
(20)
CAN message: Road
speed invalid
No apparent effect.
On
No
P1884
(33, 34)
CAN message:
Engine torque invalid
Substitute engine torque derived
from other inputs. May affect shift
quality.
On
No
P1884
(35)
CAN message:
Engine speed invalid
Maintains current gear in low range,
limp home mode in high range. Shift
pressure to maximum, harsh gear
shifts/engagement.
On
Yes
P1884
(37)
CAN message:
Engine air intake
temperature invalid
No apparent effect
On
No
P1884
(38)
Altitude shift control
invalid
No reduced torque compensation,
possible reduction in
performance/driveability at altitude
or high ambient temperatures.
On
No
*= Emissions (OBDll) relevant
†= MIL illuminates immediately (in all other faults, MIL on illuminates in the 2nd consecutive drive cycle if the fault
is still present)
44
AUTOMATIC GEARBOX
NEW RANGE ROVER
26
DESCRIPTION AND OPERATION
The fault codes can be accessed using TestBook. On
vehicles up to 99MY the automatic transmission fault
codes are a numeric code recognised by TestBook.
On V8 vehicles from 99MY the automatic transmission
fault codes are both numeric and OBDII ’P’ codes
recognised by TestBook and other suitable scantools.
After the detection of a fault, the effects remain active
for the remainder of the drive cycle. In subsequent
drive cycles, as soon as the EAT ECU diagnoses the
fault is no longer present, it resumes normal control of
the gearbox. The conditions required to diagnose that
the fault is no longer present depend on the fault.
Some faults require the engine to be started, others
require only that the ignition is switched on.
After a fault has not recurred for forty warm-up cycles,
the fault is deleted from the EAT ECU memory. Only
five different faults can be stored in the memory at any
one time. If a further fault occurs, the fault with the
lowest priority will be replaced by the new fault.
Mechanical Limp Home
In the mechanical limp home mode in high range,
gear engagement is controlled by the manual valve.
The gearbox is fixed in 4th gear if the fault occurs
while the vehicle is moving, or 3rd gear if the fault
occurs while the vehicle is stationary. 3rd gear is also
engaged if a vehicle is brought to a stop and the
selector lever is moved out of, and back into, D.
Neutral and reverse gear are also available.
In the mechanical limp home mode in low range,
depending on the severity of the fault, the engaged
gear is held until the vehicle is brought to a stop. The
gearbox then selects and holds 3rd gear.
Calibration Selection
EAT ECU’s differ between NAS, UK/Europe and ROW
markets and are identified by differentiation between
the part numbers.
On V8 vehicles from 99MY, the ECU contains two
calibrations for 4.0 and 4.6 litre engines. When a
replacement ECU is fitted, the correct ECU calibration
must be selected or the ECU will store a gearbox fault
and ’GEARBOX FAULT’ will be displayed in the
message centre. The vehicle can still be driven and is
not in ’limp home mode’.
Removed EAT ECU’s remember their calibration
setting and if re-fitted to the same vehicle will not
require calibration. A new EAT ECU will require
calibration using TestBook.
If an ECU is fitted from another vehicle, the message
centre will not display the ’GEARBOX FAULT’
message. The correct calibration level must be
selected or premature gearbox failure will occur.
ZF AUTO
27
DESCRIPTION AND OPERATION
USING THE H-GATE
To make a change from high to low or vice versa, the
vehicle must be stationary.
•
Apply the brakes and select ’N’
•
Move the selector lever into the cross-piece of
the ’H-gate’ and select the new gear range, the
panel illumination will flash before becoming
constant and an audible warning will sound.
•
When the illumination is constant select the gear
required.
CAUTION: If a gear is selected before the
gear transfer is complete, a ’clunk’ or
grinding sound will be heard because the
electric shift motor has not completed the
operation.
If this occurs and the panel illumination continues
to flash, reselect neutral and try again when the
illumination becomes constant.
If the vehicle is moving when a transfer gear
change is attempted, the message centre will
display ’SLOW DOWN’.
If an attempt is made to change the gear range
with the gear selector out of neutral, ’SELECT
NEUTRAL’ will be displayed.
High Range Gears
Use the high range for all normal road driving and
off-road driving across dry, level terrain. An audible
warning will sound, the selector lever illumination will
flash and the transfer box warning lamp will flash
while the range change is taking place. The message
centre will momentarily display ’HIGH’ as soon as high
range is selected, and then display the gear selected.
Selector lever positions:
’P’ Park
In this position the wheels are locked to prevent the
vehicle from moving. Select only with the vehicle
stationary.
’R’ Reverse
Select only when the vehicle is stationary.
’N’ Neutral
Use this position when the vehicle is stationary and
the engine is to idle for a short period.
’D’ Drive
Select ’D’ for all normal driving on good road surfaces.
Fully automatic gear changing occurs on all forward
gears according to vehicle speed and accelerator
position.
’3’
Automatic gear changing is limited to first, second and
third gears only. Use in congested traffic conditions
and for town driving.
’2’
Automatic gear changing is limited to first and second
gear ratios only. Use when driving up steep gradients
and for negotiating very narrow, twisting roads. This
position also provides moderate engine braking for
descending slopes.
’1’
First gear should only be used on very severe
gradients, especially when towing or when maximum
engine braking is required.
NOTE: If position ’2’ or ’1’ is selected from
’D’ or ’3’ while the vehicle is travelling at
high speed, then third gear will
immediately engage. Progressive deceleration will
then cause downshifts into second and then first
gear when appropriately low road speeds are
reached.
44
AUTOMATIC GEARBOX
NEW RANGE ROVER
28
DESCRIPTION AND OPERATION
’Sport’ Mode
In ’Sport’ mode gear changing is delayed to make
optimum use of the engine’s power when increased
acceleration is required or when negotiating long
inclines or twisting roads. Press the mode switch, with
the gearbox in high range, to select ’Sport’ mode. The
message centre will momentarily display ’SPORT’ and
then ’S’ along with the selected gear. Pressing the
switch a second time returns the gearbox to its normal
operation within the high range.
Low Range Gears
Use low range gears in any situation where low speed
manoeuvring is necessary, such as reversing a trailer
or negotiating a boulder strewn river bed; also use low
range for extreme off-road conditions. An audible
warning will sound, the selector lever illumination will
flash and the transfer box warning lamp will flash
while the range change is taking place. The message
centre will momentarily display ’LOW’ when the low
range is selected, and then ’L’ along with the relevant
gear selected.
Selector lever positions:
’P’ Park
As high range.
’R’ Reverse
As high range
’N’ Neutral
As high range
’4’
Select ’4’ to optimize vehicle performance for good
off-road conditions; fully automatic gear changing
occurs on all forward gears according to vehicle
speed and accelerator position.
’3’
Automatic gear changing is limited to first, second and
third gears only and should be used for reasonable
off-road conditions and ascending gradients.
’2’
Automatic gear changing is limited to first and second
ratios only when maximum engine performance is
required to ascend steep gradients. This position also
provides moderate engine braking for descending
slopes.
’1’
Select ’1’ on very severe gradients, particularly when
towing, when maximum engine performance and
engine braking is required.
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