Range Rover. Manual — part 98
LAND ROVER V8
59
DESCRIPTION AND OPERATION
The fuel tank pressure sensor is included as part of
the OBD system. A failure of the fuel tank pressure
sensor will not be noticed by the driver, but if the ECM
detects a fault, it will be stored in the diagnostic
memory and the MIL warning lamp will be illuminated
on the instrument pack
Possible fuel tank pressure sensor failures are listed
below:
•
Damaged sensor
•
Harness wiring or connector faulty
•
Open circuit
•
Short circuit to battery voltage or ground
•
ECM fault
Possible symptoms of a fuel tank pressure sensor
failure are listed below:
•
Fuel tank pressure sensor poor performance
•
Fuel tank pressure sensor low range fault
•
Fuel tank pressure sensor high range fault
Fault codes associated with the evaporative emission
control system are listed below:
•
P0171 - Multiplication fuelling adaption (Max.)
exceeded lean limit - LH bank
•
P0172 - Multiplication fuelling adaption (Min.)
exceeded lean limit - LH bank
•
P0174 - Multiplication fuelling adaption (Max.)
exceeded lean limit - RH bank
•
P0175 - Multiplication fuelling adaption (Min.)
exceeded lean limit - RH bank
•
P0171 - Additive fuelling adaption (Max.)
exceeded lean limit - LH bank
•
P0172 - Additive fuelling adaption (Min.)
exceeded lean limit - LH bank
•
P0174 - Additive fuelling adaption (Max.)
exceeded lean limit - RH bank
•
P0175 - Additive fuelling adaption (Min.)
exceeded lean limit - RH bank
•
P0440 - Purge valve not sealing
•
P0442 - Small leak within system
•
P0443 - Purge valve power stage short circuit to
battery voltage
•
P0444 - Purge valve power stage open circuit
•
P0445 - Purge valve power stage short circuit to
ground
•
P0445 - Large leak within system
•
P0446 - CVS valve / filter / pipe blocked
•
P0447 - CVS valve open circuit
•
P0448 - CVS valve short circuit to ground
•
P0449 - CVS valve short circuit to battery
voltage
•
P0451 - Fuel tank pressure signal stuck high
within range
•
P0452 - Fuel tank pressure signal short circuit to
battery voltage (out of range - high)
•
P0453 - Fuel tank pressure sensor signal short
circuit to ground or open circuit (out of range -
low)
19
FUEL SYSTEM
NEW RANGE ROVER
60
DESCRIPTION AND OPERATION
Secondary air injection system (NAS only from
2000MY)
Refer to EMISSION CONTROL section for description
of the secondary air injection system components.
Inertia Fuel Shut-off (IFS) Switch
The inertia switch isolates the power supply to the fuel
pump in the event of sudden deceleration, as
encountered during an accident. The inertia switch is
located in the right hand side footwell behind an
access flap. It is reset by depressing the central
plunger at the top of the switch.
E-box Cooling Fan control - from 99MY only
The cooling fan is utilised to provide a cool
temperature environment for the Bosch Motronic 5.2.1
ECM in the under bonnet mounted E-box. The fan
provides cabin air into the E-box and operation is
controlled by the ECM. The ECM contains an internal
temperature sensor which it uses to determine when
cooling fan operation is necessary.
Spark plugs - from 99MY
The spark plugs are platinum tipped on both centre
and earth electrodes to provide a long maintenance
free life and exceptional cold starting performance.
CAUTION: Do not clean the spark plugs or
attempt to reset the spark plug gap.
CAUTION: If the wrong specification spark
plugs are used, the misfire detection
system is likely to malfunction and
corresponding error codes will be stored in the
ECM diagnostic memory. Only use the
recommended spark plugs.
In the event of a spark plug failure, a misfire on a
specific cylinder may be observed.
A spark plug failure may occur for the following
reasons:
•
Connector or wiring fault
•
Faulty plug (e.g. wrong gap, damaged
electrodes etc.)
•
Incorrect spark plugs fitted
•
Breakdown of high tension lead causing tracking
to chassis earth
High tension (ht) leads
The ht leads are routed from the ignition coils at the
back of the engine to four spark plugs on each bank of
the engine block.
An ht lead failure will result in a misfire condition on a
specific cylinder.
An ht lead failure may occur for the following reasons:
•
Connector / wiring fault
•
Faulty lead causing spark tracking to chassis
earth
•
Damage to ht lead during gearbox removal
Electronic Automatic Gearbox Interface - from
99MY
The ECM communicates with the EAT ECU via a
Controller Area Network (CAN). This is used for the
gearshift torque interface and as a means for
transmitting OBD information between the two control
units. The EAT ECU passes OBD data and requests
to the ECM which controls the storage of diagnostics
data and MIL activation. Unlike the GEMS ECM, the
Bosch M5.2.1 does not store gearbox faults. The MIL
activation request can be checked with Testbook.
The CAN network is a high speed serial interface
operating at 500 k-baud. The system is a differential
bus using a twisted pair. If either or both wires of the
twisted pair CAN bus is open or short circuited, a CAN
time out fault will occur and the EAT ECU defaults to
third gear.
See AUTOMATIC GEARBOX, Description and
operation.
LAND ROVER V8
61
DESCRIPTION AND OPERATION
Transfer Box ECU (MIL input) - from 99MY (NAS only)
The input from the transfer box ECU to the ECM indicates that there is an OBD relevant error detected within the
transfer box ECU and requests activation of the MIL. In addition, the ECM carries out an integrity check on the
signal following an "ignition ON" condition.
See TRANSFER BOX, Description and operation.
Engine Speed Output - from 99MY
The ECM supplies engine speed information to various vehicle systems (instrument pack etc.). The system uses
an output frequency of 4 pulses per engine revolution.
HeVAC system interface - from 99MY
The diagnostics for the condenser fans and A/C grant signal is disabled and so it is not possible to detect open
and short circuit conditions on these lines.
The condenser fans can be switched on by either the HeVAC ECU or the engine management ECM (to assist
engine cooling) or by the fan control logic.
See HEATING AND VENTILATION, Description and operation.
See AIR CONDITIONING, Description and operation.
Fuel used signal - from 99MY
This output is required to provide fuel consumption information to the trip computer.
Fuel level input - from 99MY
This input is required by the ECM as part of the misfire detection strategy, in order to record a "low fuel" situation
was present when misfire was detected and logged as a fault. The signal is received as an analogue signal from
the fuel tank sender unit.
Fuel Level State
Sender Resistance
Fuel Level Signal
Voltage
Full
19 ohm
1.00 V
Empty
270 ohm
3.16 V
Low Fuel Lamp
ON threshold
above 175 ohm
2.77 V
Low Fuel Lamp
OFF threshold
less than 117 ohm
2.40 V
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