catalytic converter JAGUAR S TYPE 1999 1.G Powertrain Manual

V6 EngineAJ-V6/AJ28
43 Intake Air Temperature (IAT) Sensor
The IAT sensor is a conventional thermistor type
device which is a push fit in the intake resonator
duct.
Mass Air Flow (MAF) Sensor
The MAF sensor is an integral assembly consisting
of a hot wire sensor unit and air duct and is non-
serviceable. The assembly is fitted between the air
cleaner and intake resonator tube.
D.303.1381
MAF AND IAT SENSORS
D.303-1381
J.303.1386
HO2 SENSORS
J.303-1386
Heated Oxygen (HO2) Sensors
HO2 sensors are fitted in both the upstream and
downstream positions on the catalytic converters.
Both sensors are standard types with a step
response at the stoichiometric (lambda) air/fuel
value. The upstream sensors provide the feedback
for stoichiometric fuelling control and the
downstream sensors monitor catalyst efficiency
and also provide long term fuelling adaptation
trim.
MAF SensorIAT Sensor

J.303.1318
V8 Engine AJ-V6/AJ28
48
Exhaust Manifold
The exhaust manifolds have a double wall
construction and are manufactured from
austenitic stainless steel. The double wall
construction has a number of advantages:
¥ it provides a significant reduction in the
external heat generated and therefore
improves underhood thermal management
¥ a heat shield is not required
¥ the durability of the manifold is increased (eg
less likely to crack)
¥ by retaining heat, the insulation effect
provides a slight improvement in the time to
catalyst light-off.
The manifold couples to the catalytic converter
via a spherical joint which requires no gasket or
sealant. EXHAUST MANIFOLD
J.303.1318