Jaguar XJ (X350). Service manual — part 1076
Description and operation
Exhaust System
Item
Part Number
Description
1
Catalytic converters
2
Diesel particulate filter
3
Front muffler
4
Muffler and tailpipes
Item
Part Number
Description
1
Diesel particulate filter differential pressure sensor
The exhaust system for various engines are of similar design but utilize different internal elements to
achieve a distinct exhaust note for each variant.
Catalytic Converters
The catalytic converters are of a monolithic structure and are coated in platinum. The platinum
coating is used to control the emissions of hydrocarbons (HC), carbon monoxide (CO) and oxides of
nitrogen (NOx) and to convert them into less harmful products for example carbon dioxide (CO)
nitrogen (N) and water (HO).
The catalytic converters are connected to the turbocharger by a three nut flange and is sealed by a
gasket. Exhaust jointing compound must not be applied to these joints due to the possibility of
catalytic converter contamination. Avoid allowing any foreign particles of debris into the catalytic
downpipe as this can result in damage to the catalytic converter.
Diesel Particulate Filter
In order to meet strict Euro IV emission limits there is now a stipulation to reduce gaseous and
particulate emissions greatly. The primary component within the exhaust system of the diesel is the
diesel particulate filter. The diesel particulate filter uses new filter technology based on a combined
filter and oxidation catalytic converter to store, and when conditions allow, destroy the particulates.
The diesel particulate filter is of a silicon carbide filter construction. It has an additional wash coating
on its filter surface of platinum and other active components which are used in the manufacture of
oxidation catalytic converters. The exhaust gasses pass through the filter, leaving the particulates
behind that are too big to pass through the filters pores. With engine management intervention and
the catalytic coating this will promote particulate combustion and oxidation of carbon monoxide (CO)
and hydrocarbon (HC) emissions. By carrying out this process, this will regenerate the diesel
particulate filter to prevent increased back-pressure and the possibility of a completely blocked filter.
Diesel particulate filter differential pressure sensor
The diesel particulate filter differential pressure sensor monitors the differential pressure in the
pipeline, upstream and downstream of the diesel particulate filter. The filtering of the particulates
will lead to a greater resistance to the exhaust gas flow through the diesel particulate filter. This
leads to a greater pressure difference upstream and downstream of the diesel particulate filter. The
diesel particulate filter differential pressure sensor is a membrane sensor with strain resistances. The
strain resistances change depending on the pressure difference. This leads to a change in the signal
voltage. This signal is one of the parameters required for the strategy of the regeneration of the
diesel particulate filter.
Exhaust System – Armoured
Muffler and Tailpipe
The exhaust system is modified so that the engine cannot be stalled by stopping the flow of exhaust
system emissions. Unique muffler and tailpipes are installed to the vehicle for this purpose.
Vehicles
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Diagnosis and testing
Exhaust System
Overview
2006MY sees the introduction of diesel to X350 and is accompanied by a diesel particulate filter
(DPF) system to comply with strict stage four emissions requirements. The engine management
system (EMS) makes use of 7-digit diagnostic trouble codes (DTCs) rather than the familiar 5-digit.
Refer to the DTC index in this section for guidance on how to use these codes with the Jaguar
approved diagnostic system or a scan tool.
For information on the operation of the system,
Exhaust System
Inspection and Verification
1 . Verify the customer concern.
2 . Visually inspect for obvious signs of mechanical or electrical damage.
Mechanical
Electrical
Leaks
Metal fatigue
Pipes, mufflers and catalytic converters
Diesel particulate filter (DPF)
DPF differential pressure sensor tubes
Joints
Mountings
Clearance around components
Battery charge and condition
Wiring harness
Electrical connector(s)
5 volt sensor supply
Sensor(s)
Engine control module (ECM)
3 . If an obvious cause for an observed or reported concern is found, correct the cause (if possible)
before proceeding to the next step.
4 . If the cause is not visually evident use the Jaguar approved diagnostic system or a scan tool to
retrieve the fault codes before proceeding to the DTC index, or the symptom chart if no DTCs are set.
Symptom Chart
Symptom
Possible source
Action
Noisy or
leaking
exhaust
Exhaust system/components
Install new components as necessary.
Exhaust System - 2.7L V6 - TdV6
Lack of power
Air intake system fault
Diesel particulate fliter (DPF)
blocked/restricted
Restricted exhaust system
Low fuel pressure
Exhaust gas recirculation
(EGR) valve(s) fault
Turbocharger(s) fault
Check the air intake system,
Intake Air Distribution and Filtering Check for a
blocked DPF or catalytic converter, install new
components as necessary.
Diesel Particulate Filter (DPF) or
Catalytic Converter - 2.7L V6 - TdV6 (17.50.05)
Check the fuel pressure,
Fuel Charging and Controls For EGR tests,
Engine Emission Control For turbocharger tests,
Turbocharger
DTC index
NOTE:
Generic scan tools may not read the codes listed, or may read only 5-digit codes. Match the 5
digits from the scan tool to the first 5 digits of the 7-digit code listed to identify the fault (the last
2 digits give extra information read by the manufacturer-approved diagnostic system).
NOTE:
For a full list of powertrain DTCs,
Electronic Engine Controls
P024B00
Diesel particulate filter
(DPF) temperature
sensor - catalyst
downstream circuit
range/performance
(right hand bank)
Temperature sensor -
catalyst
downstream
circuit: high
resistance
Temperature sensor -
catalyst
downstream
circuit: short
For temperature sensor - catalyst
downstream circuit tests, GO to
Pinpoint Test G552286p2.
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