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Land Rover Lesson 2 Auto Trans Coolingine Rover Manual

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Page 81

four pulses for every two engine revolutions. The
sensing element is positioned between 0 and 2mm from
the side of the cam gear wheel.
The variable cam inlet is parked in the retarded position
and can advance up to 48 degrees.
The camshaft timing wheel is a sintered component
which has four teeth on it to enable the EMS to detect
cylinder identification. The signal is used for:
•Variable inlet cam timing
•Cylinder recognition
•Enabling sequential fuel injection
•Knock control
•Cylinder identification for...

Page 82

FUEL RAIL TEMPERATURE
SENSOR
The fuel rail temperature sensor measures the
temperature of the fuel in the fuel rail. This input is then
used to deliver the correct quantity of fuel to the engine.
Operating Range -40 Degrees Celsius to 150 Degrees
Celsius. The fuel rail temperature sensor is fitted on the
rear of the right hand bank (bank A) fuel rail.
MASS AIR FLOW/INLET AIR
TEMPERATURE SENSOR (MAF/IAT)
The air flow meter is located in the clean air duct
immediately after the air filter box.
The air mass...

Page 83

MANIFOLD ABSOLUTE PRESSURE
SENSOR (MAP)
The MAP sensor provides a voltage proportional to the
absolute pressure in the intake manifold. This signal
allows the load on the engine to be calculated and used
within the internal calculations of the ECM. The sensor
is located on the rear of the air intake manifold.
DescriptionPin No
MAP signal1
Sensor supply2
Not used3
Sensor ground4
The output signal from the MAP sensor, together with
the CKP and IAT sensors, is used by the ECM to
calculate the amount of air...

Page 84

Care must be taken at all times to avoid damaging the
knock sensors, but particularly during removal and
fitting procedures. The recommendations regarding
torque and surface preparation must be adhered to. The
torque applied to the sensor and the quality of the
surface preparation both have an influence over the
transfer of mechanical noise from the cylinder block to
the crystal.
The ECM uses the signals supplied by the knock
sensors, in conjunction with the signal it receives from
the camshaft sensor,...

Page 85

A software strategy within the ECM enables the throttle
position to be calibrated each ignition cycle. When the
ignition is turned ON, the ECM performs a self test and
calibration routine on the electronic throttle by opening
and closing the throttle fully.
Electronic Throttle Pin Out Table
DescriptionPin No
Motor -1
Motor +2
Sensor ground3
Sensor 2 signal4
Sensor 1 signal5
5 volt supply6
ACCELERATOR PEDAL POSITION
SENSOR (APP)
The APP sensors are located on the accelerator pedal
assembly.
The APP...

Page 86

Upstream Oxygen Sensors
Downstream Oxygen Sensors
The oxygen sensors need to operate at high temperatures
in order to function correctly. To achieve the high
temperatures required, the sensors are fitted with heater
elements that are controlled by a PWM signal from the
ECM. The heater elements are operated immediately
following engine start and also during low load
conditions when the temperature of the exhaust gases
is insufficient to maintain the required sensor
temperatures. A non-functioning heater...

Page 87

•Sensor open circuit / disconnected.
•Short circuit to vehicle supply or ground.
•Lambda ratio outside operating band.
•Crossed sensors bank A & B.
•Contamination from leaded fuel or other sources.
•Change in sensor characteristic.
•Harness damage.
•Air leak into exhaust system.
Failure Symptoms
•Default to Open Loop fuelling for the particular
cylinder bank
•High CO reading.
•Strong smell of H02S (rotten eggs) till default
condition.
•Excess Emissions.
It is possible to fit front and rear sensors in...

Page 88

The engine has 8 fuel injectors (one per cylinder), each
injector is directly driven by the ECM. The injectors
are fed by a common fuel rail as part of a ‘returnless’
fuel system. The fuel rail pressure is regulated to 4.5
bar by a fuel pressure regulator which is integral to the
fuel pump module, within the fuel tank. The injectors
can be checked by resistance checks. There is a fuel
pressure test Schrader valve attached to the fuel rail on
the front LH side for fuel pressure testing purposes. The
ECM...

Page 89

VARIABLE VALVE TIMING (VVT)
Variable valve timing is used on the V8 engine to
enhance low and high speed engine performance and
idle speed quality.
For each inlet camshaft the VVT system comprises:
•VVT unit
•Valve timing solenoid
The VVT system alters the phase of the intake valves
relative to the fixed timing of the exhaust valves, to
alter:
•The mass of air flow to the cylinders.
•The engine torque response.
•Emissions.
The VVT unit uses a vane type device to control the
camshaft angle. The system...

Page 90

the high viscosity of the oil. While at high oil
temperatures the low oil viscosity may impair the VVT
operation at low oil pressures. The oil pump has the
capacity to cope with these variations in oil pressure
while an oil temperature sensor is monitored by the
ECM to provide oil temperature feedback. At extremely
high oil temperatures the ECM may limit the amount
of VVT advance in order to prevent the engine from
stalling when returning to idle speed.
VVT does not operate when engine oil pressure is...
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