Jaguar X-Type 2001 User Manual
ON-BOARD DIAGNOSTICS
V6 and V8 Engine Management
Vehicle Coverage:
X-Type 2.5L V6 and 3.0L V6 2001 model year onwards
X-Type 2.0L V6 2001 model year onwards
S-Type 3.0L V6, 4.2L V8 (normally aspirated and supercharged) from 2002 model year onwards
XK Range 4.2L V8 (normally aspirated and supercharged) from 2003 model year onwards
New XJ 4.2L V8 2003 model year onwards.
Includes Anti-lock Braking System (ABS) monitors from 2004 model year
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1 Contents
1
Contents .........................................................................................................................................................................................................................................2
2 OBDII Systems ............................................................................................................................................................................................................................... 6
3 Engine Management System .........................................................................................................................................................................................................7
3.1.1 Fuel Injection....................................................................................................................................................................................................................7
3.1.2 Ignition..............................................................................................................................................................................................................................8
3.1.3 Variable Valve Timing (Normally Aspirated Engines) ......................................................................................................................................................8
3.1.4 Variable Air Intake System (V6 Engines).........................................................................................................................................................................8
3.1.5 Exhaust Gas Recirculation (V8 Engines).........................................................................................................................................................................8
3.1.6 Electronic Throttle Control ...............................................................................................................................................................................................9
3.1.7 Idle Speed Control ...........................................................................................................................................................................................................9
3.1.8 Vehicle Speed Control .....................................................................................................................................................................................................9
4 Sensors and Actuators .................................................................................................................................................................................................................10
5 Mode $06 Data .............................................................................................................................................................................................................................12
6 On Board Monitoring ....................................................................................................................................................................................................................14
6.1 Catalyst Efficiency Monitor....................................................................................................................................................................................................14
6.2 Misfire Monitor.......................................................................................................................................................................................................................18
6.2.1 Misfire Detection ............................................................................................................................................................................................................22
6.3 Heated Oxygen Sensor Monitor............................................................................................................................................................................................27
6.3.1 Downstream Oxygen Sensors High/Low Input Monitor.................................................................................................................................................27
6.3.2 Downstream Oxygen Sensors Heater Circuit High........................................................................................................................................................29
6.3.3 Downstream Oxygen Sensors Heater Circuit Low ........................................................................................................................................................30
6.3.4 Downstream Oxygen Sensors No Activity Detected......................................................................................................................................................30
6.3.5 Upstream Oxygen Sensors Circuit.................................................................................................................................................................................34
6.3.6 Upstream Oxygen Sensors Slow Response..................................................................................................................................................................35
6.3.7 Upstream Oxygen Sensors Heater Circuit.....................................................................................................................................................................36
6.3.8 Control Module...............................................................................................................................................................................................................37
6.4 Fuel System Monitor .............................................................................................................................................................................................................38
6.4.1 Fuel System Secondary Trim.........................................................................................................................................................................................41
6.5 Evaporative Emissions System Monitor................................................................................................................................................................................42
6.5.1 Leak Test Operation ......................................................................................................................................................................................................42
6.6 Fuel Tank Pressure Sensor Circuit .......................................................................................................................................................................................52
6.6.1 High/Low Input Failure ...................................................................................................................................................................................................52
6.6.2 Range/Performance Failure...........................................................................................................................................................................................52
6.7 Exhaust Gas Recirculation System Monitor (V8 Engines)....................................................................................................................................................53
6.7.1 High/Low Input Failure ...................................................................................................................................................................................................53
6.7.2 Exhaust Gas Recirculation Valve Range/Performance Failure .....................................................................................................................................53
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Crankshaft/Camshaft Position Sensor ..................................................................................................................................................................................55
6.8
6.8.1 Open and Short Circuit Detection of the Crank Signal ..................................................................................................................................................55
6.8.2 Intermittent Crank Failure Detection ..............................................................................................................................................................................55
6.8.3 Crank Request Signal High Input Monitor .....................................................................................................................................................................55
6.8.4 Open/Short Circuit .........................................................................................................................................................................................................55
6.8.5 Missing Phase Detection ...............................................................................................................................................................................................55
6.9 Mass Airflow Sensor and Manifold Absolute Pressure Sensor............................................................................................................................................. 58
6.9.1 High/Low Input Failure and Ground Monitor..................................................................................................................................................................58
6.9.2 Range/Performance Failure...........................................................................................................................................................................................58
6.10 Barometric Pressure Sensor .............................................................................................................................................................................................64
6.10.1 High/Low Input Failure ...................................................................................................................................................................................................64
6.10.2 Range/Performance Failure...........................................................................................................................................................................................64
6.11 Intake Air Temperature Sensor .........................................................................................................................................................................................65
6.11.1 High/Low Input Failure ...................................................................................................................................................................................................65
6.11.2 Range/Performance Check 1.........................................................................................................................................................................................66
6.11.3 Range/Performance Check 2.........................................................................................................................................................................................66
6.12 Intake Air Temperature Sensor 2 Monitor (V8 Supercharged Only) .................................................................................................................................67
6.12.1 High/Low Input Failure ...................................................................................................................................................................................................67
6.12.2 Range/Performance Check 1.........................................................................................................................................................................................67
6.12.3 Range/Performance Check 2.........................................................................................................................................................................................67
6.12.4 Range/Performance Check 3.........................................................................................................................................................................................67
6.13 Engine Coolant Temperature Sensor ................................................................................................................................................................................68
6.13.1 High/Low Input Failure ...................................................................................................................................................................................................68
6.13.2 Range/Performance Failure...........................................................................................................................................................................................69
6.14 Thermostat Monitor............................................................................................................................................................................................................73
6.15 Throttle Position Sensor ....................................................................................................................................................................................................74
6.16 Engine Oil Temperature Sensor ........................................................................................................................................................................................75
6.16.1 High/Low Input Failure ...................................................................................................................................................................................................75
6.16.2 Range/Performance Failure...........................................................................................................................................................................................75
6.17 Fuel Rail Temperature Sensor ..........................................................................................................................................................................................76
6.17.1 High/Low Input Failure ...................................................................................................................................................................................................76
6.17.2 Range/Performance Failure...........................................................................................................................................................................................76
6.18 Fuel Rail Pressure Sensor.................................................................................................................................................................................................78
6.18.1 High/Low Input Failure ...................................................................................................................................................................................................78
6.18.2 Stuck Detection ..............................................................................................................................................................................................................78
6.18.3 Offset Detection .............................................................................................................................................................................................................78
6.19 Fuel Injectors .....................................................................................................................................................................................................................80
6.20 Fuel Pumps........................................................................................................................................................................................................................81
6.20.1 Primary Fuel Pump - No Commands Received.............................................................................................................................................................81
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Primary Fuel Pump - Not Working When Requested ....................................................................................................................................................81
6.20.2
6.20.3 Primary Fuel Pump Circuit High/Low Fault....................................................................................................................................................................81
6.20.4 Secondary Fuel Pump Monitor ......................................................................................................................................................................................83
6.21 Fuel Level Sensor.............................................................................................................................................................................................................. 84
6.21.1 Fuel Level Stuck Monitor ...............................................................................................................................................................................................84
6.21.2 Fuel Level Noisy Monitor ...............................................................................................................................................................................................84
6.22 Knock Sensor ....................................................................................................................................................................................................................85
6.22.1 High/Low Input Failure ...................................................................................................................................................................................................85
6.22.2 Knock Sensor Processor Failure ...................................................................................................................................................................................86
6.23 Variable Valve Timing........................................................................................................................................................................................................86
6.24 Ignition Amplifiers/Coils .....................................................................................................................................................................................................88
6.25 Charge Air Cooler Water Pump.........................................................................................................................................................................................89
6.26 Idle Speed Control.............................................................................................................................................................................................................90
6.27 Starter Relay...................................................................................................................................................................................................................... 92
6.28 Air Conditioning Clutch Relay............................................................................................................................................................................................92
6.29 Park/Neutral Switch ........................................................................................................................................................................................................... 93
6.30 Accelerator Pedal Position Sensor Monitor.......................................................................................................................................................................94
6.31 Throttle Control..................................................................................................................................................................................................................95
6.31.1 Sensor Power Supply Monitor .......................................................................................................................................................................................95
6.31.2 Analogue Ground Monitor..............................................................................................................................................................................................95
6.31.3 Throttle Actuator Control Monitor................................................................................................................................................................................... 96
6.31.4 Throttle Motor Relay Monitor .........................................................................................................................................................................................96
6.31.5 Throttle Motor Relay Driver Monitor............................................................................................................................................................................... 96
6.31.6 Throttle Return Spring Monitor.......................................................................................................................................................................................97
6.31.7 Throttle Limp Home Spring Monitor...............................................................................................................................................................................97
6.31.8 Throttle Watchdog Monitor.............................................................................................................................................................................................97
6.32 Intake Manifold Tuning Valve System .............................................................................................................................................................................101
6.33 Generator Monitor............................................................................................................................................................................................................101
6.33.1 Generator Charge Line Monitor (V6 Only)...................................................................................................................................................................101
6.33.2 Generator Field Line Failure (V6 Only)........................................................................................................................................................................101
6.33.3 Charging System/Generator Load Failure ...................................................................................................................................................................101
6.34 Engine Control Module ....................................................................................................................................................................................................102
6.34.1 ECM Control Relay Monitor .........................................................................................................................................................................................103
6.34.2 Main Processor Monitor ...............................................................................................................................................................................................103
6.34.3 Sub Processor Monitor ................................................................................................................................................................................................103
6.34.4 Battery Back Up Monitor ..............................................................................................................................................................................................103
6.34.5 Processor Communications Monitor ............................................................................................................................................................................104
6.34.6 Engine Control Module Keep Alive Memory Monitor...................................................................................................................................................104
6.35 Communications Network Monitors.................................................................................................................................................................................107
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Anti-lock Braking System System ..............................................................................................................................................................................................108
7
7.1 Wheel Speed Sensors ........................................................................................................................................................................................................108
7.1.1 Wheel Speed Sensor Monitoring (XJ Range, XK Range and S-Type)........................................................................................................................108
7.1.2 Wheel Speed Sensor Monitoring (X-Type) ..................................................................................................................................................................111
7.2 Control Module Failure........................................................................................................................................................................................................113
Jaguar Cars Revision Date: May 2004 Page 5 of 113
2 OBDII Systems
California On-Board Diagnostics II (OBD) applies to all gasoline engine vehicles up to 14,000 lbs. Gross Vehicle Weight Rating (GVWR) starting in the 1996
model year and all diesel engine vehicles up to 14,000 lbs. GVWR starting in the 1997 model year.
"Green States" are states in the Northeast that chose to adopt California emission regulations, starting in the 1998 model year. At this time, Massachusetts, New
York, Vermont and Maine are Green States. Green States receive California certified vehicles for passenger cars and light trucks up to 6,000 lbs. GVWR.
The National Low Emissions Vehicle program (NLEV) requires compliance with California OBDII, including 0.020" Evaporative Emissions (EVAP) system
monitoring requirements. The NLEV program applies to passenger cars and light trucks up to 6,000 lbs. GVWR nationwide from 2001 model year through 2003
model year.
Federal OBD applies to all gasoline engine vehicles up to 8,500 lbs. GVWR starting in the 1996 model year and all diesel engine vehicles up to 8,500 lbs. GVWR
starting in the 1997 model year.
OBDII system implementation and operation is described in the remainder of this document.
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3 Engine Management System
The Engine Control Module (ECM) controls the engine management system. The system consists of an ECM and a number of sensing and actuating devices.
The sensors supply the ECM with input signals, which relate to engine operating conditions and driver requirements. The ECM uses calibrated data-tables and
maps to evaluate the sensor information. The ECM then uses the results to command an appropriate response from the actuating devices. The system provides
the necessary engine control accuracy and adaptability to:
• Minimize exhaust emissions and fuel consumption.
• Provide optimum driver control under all conditions.
• Minimize evaporative fuel emissions.
• Provide system diagnostics when malfunctions occur.
In addition to these functions the ECM also interfaces with other vehicle systems through the Controller Area Network (CAN) communications network.
The 32-bit ECM is at the center of the system and provides the overall control. Its functions are listed below, each of which are dependent on the engine and
vehicle state at any moment of time and driver requirements.
• Starting: Ensures that conditions are safe to crank the engine.
• Engine: Controls the rate of air and fuel flow into the cylinders; adjusts the intake manifold volume; controls the ignition and intake camshaft timing.
• Fuel supply: Controls the operation of the fuel pumps and the EVAP canister purge valve.
• Cooling: Controls the engine cooling fans.
• Battery: Optimizes the battery charging conditions.
• Air Conditioning (A/C) and screen heater: Controls the speed of the engine when these additional loads are added, also disables the A/C when it is
beneficial to reduce the load on the engine.
• Speed control: Provides the option to maintain a fixed vehicle speed without driver intervention.
• Robustness: Maintains engine running condition under intermittent or permanent single point failures on any sensors or actuators fitted to the system,
and records Diagnostic Trouble Codes (DTCs) of these failures for system diagnosis.
• Diagnosis: Notifies the driver when a system malfunction occurs and records data for system diagnosis.
3.1.1 Fuel Injection
The ECM controls one injector per cylinder in sequential operation. The size of the injector used is so that stoichiometric control is possible at minimum load with
allowance for EVAP canister purge valve correction, and at maximum load to provide sufficient fuel flow at all engine speeds. The timing of injector firing, relative
to intake valve closing, during normal starting and running conditions is optimized to provide the best compromise between emissions and performance, time to
first-ignition and smooth engine operation at start-up, for all engine conditions at all temperatures. The mass of fuel per-injection is derived from a calculation
based on a ratiometric match to the metered airflow.
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The ECM is capable of adapting to fuel system tolerances and engine internal wear under all operating conditions. The ECM continually monitors the differential
pressure between the fuel rail and plenum, and uses this value to calculate the injector pulse width with the required mass of fuel per-injection. The ECM also
continually monitors the temperature of the fuel being injected into the engine and provides compensation for the changing flow characteristics of the fuel system
at different temperatures. By monitoring the battery supply voltage the ECM can ensure that the fuel supply to the engine is unaffected by voltage fluctuation.
3.1.2 Ignition
The system uses one ignition coil per-cylinder. A base ignition map is provided so that the engine can be optimized for emissions, fuel economy, performance
and avoidance of cylinder knock throughout its speed and load range. Ignition timing during starting is used during engine cranking and under speed modes to
provide the best compromise between emissions, time to first ignition and smooth engine operation at start up, at all temperatures. Provision is made to
compensate for the effect of changing air intake temperature on the combustion detonation limit. The system contains the necessary hardware for the detection
of combustion knock within the engine cylinders; the ECM uses this information to gradually adjust the ignition timing until the combustion knock is at a safe and
inaudible level.
3.1.3 Variable Valve Timing (Normally Aspirated Engines)
The ECM controls the fully variable phase change system, which acts on the intake camshafts. The target positions of both camshafts are optimized to provide
the best compromise between performance, refinement, fuel economy and emissions. During transient operation, the rate of change of the Camshaft Position
(CMP) is controlled to optimize drivability. Operation of the Variable Valve Timing (VVT) will be restricted if environmental conditions exist that could affect
normal operation of the VVT, for example very low ambient temperatures. Provision is made to ensure that the intake camshafts are restrained in the retard
position during engine start. The ECM will also detect a variable valve timing mechanical malfunction, and act to compensate for the malfunction.
3.1.4 Variable Air Intake System (V6 Engines)
The ECM controls two intake manifold tuning valves. Each valve is a two positional device; the switching point of the valve is dependant on engine speed and a
definable change in engine performance. The valve switching points are optimized for maximum torque in the wide-open Throttle Position (TP).
3.1.5 Exhaust Gas Recirculation (V8 Engines)
The ECM controls the flow of exhaust gases to reduce oxides of nitrogen in emissions by re-circulating metered amounts of exhaust gas into the intake of the
engine. This lowers the combustion temperature, limiting the formation of nitrogen oxides. The Exhaust Gas Recirculation (EGR) flow is optimized for fuel
economy, emissions and drivability for all engine-operating conditions.
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3.1.6 Electronic Throttle Control
The electronic throttle controls the airflow into the engine under closed loop feedback control of the ECM. The correct throttle disc position is calculated as a
function of driver demand and of the engine's momentary operating mode. A fail safe system is incorporated that complies with legislative requirements, including
mechanical limp-home operation.
3.1.7 Idle Speed Control
Idle speed is dependent on Engine Coolant Temperature (ECT) and gear selection (neutral or drive). Idle speed is optimized for combustion stability, idle quality,
Idle Speed Control (ISC) capability and fuel economy at all operating conditions. Compensations to the idle speed will be made for conditions, such as variable
ambient air temperature, to increase idle speed to satisfy charging system requirements.
3.1.8 Vehicle Speed Control
The engine management system incorporates a speed control system. This enables the driver to set a speed, and control and maintain the speed of the vehicle
without having to operate the accelerator pedal. The speed control switches are momentary action switches, mounted on the steering wheel. The function of the
switches is organized so that a function relating to a switch of higher priority always overrides a function relating to a lower priority switch. The switch priority is:
• 1. Cancel
• 2. Set
• 3. Resume
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4 Sensors and Actuators
The following table defines the function of the engine mounted sensors and actuators:
Component Function
Fuel injectors Delivers fuel to the engine cylinder intake ports in sequential order. There are 12 fuel injection holes per cylinder,
delivering fuel droplets as small as 60 microns in diameter. This size of fuel droplet reduces fuel wetting of the intake port
and promotes excellent fuel air mixing. Reducing noxious emissions and improving fuel economy while the engine is
warming up.
On-plug ignition coil The ECM controls one coil per spark plug in sequential order. The ignition coil provides the energy to the spark plug to
ignite the air fuel mixture in the engine cylinder. The ignition coil works on the principle of 'mutual induction'. By closing and
then opening the ignition coil primary circuit, the primary current increases, and then suddenly decreases to induce the
high voltage in the secondary circuit needed to fire the spark plug.
CMP sensor Signals from the CMP sensors are used to synchronize the ECM to the engine cycle during engine starting. For example,
whether the Crankshaft Position (CKP) sensor is indicating an induction or firing stroke. The position of both intake
camshafts is monitored to allow the ECM to control the phase of the intake camshafts relative to the position of the
crankshaft. On engines with VVT, the CMP sensor provides feedback control on the intake camshaft's position relative to
the position of the crankshaft and exhaust camshafts.
Oil control solenoid - VVT
(normally aspirated engines)
Manifold Absolute Pressure
(MAP) sensor
Knock sensor The knock sensors produce a voltage signal with respect to the engine's combustion level. The knock sensor detects and
Fuel rail pressure sensor Continuously monitors the fuel pressure between the fuel rail and plenum, this value is used by the ECM as one of its
Fuel rail temperature sensor The fuel rail temperature sensor continuously monitors the temperature of fuel being injected into the engine; this value is
Intake manifold tuning valves (V6
engines)
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The oil control solenoid is a hydraulic actuator, which advances and retards the intake camshaft timing, thereby altering
the camshaft-to-crankshaft phasing.
The manifold absolute pressure sensor is used for EGR diagnostic testing only.
reports combustion knock within the engine cylinders. The ECM uses this information to gradually adjust the ignition timing
until the combustion knock is at a safe and inaudible level. The knock control system cannot advance the ignition past the
mapped values; it retards the ignition timing to reduce combustion knock and then advances to its original value.
factors to calculate the injector pulse-width required to deliver the correct mass of fuel per injection. The ECM also uses
this information to demand a specific fuel flow rate from the fuel pump via the fuel pump module.
used by the ECM to provide compensation for the changing flow characteristics of the fuel system with temperature. The
ECM therefore ensures that engine performance is unaffected by temperature changes in the fuel supply.
The intake manifold tuning valves are a two positional 'open or close' device used to create a variable air intake system.
The intake manifold tuning valve positions are switched, via signals from the ECM, to optimize torque across the engine
speed and load range. The intake manifold tuning valves work in conjunction with the operation of the throttle body
sensors.
Component Function
Throttle body assembly The throttle body controls the airflow into the engine by use of the throttle motor and TP sensor. Throttle-disc position is
operated by the throttle motor using signals received from the Accelerator Pedal Position (APP) sensor, via the ECM. The
ECM, via the TP sensor, monitors throttle disc angle. The ECM on application of external loads, for example the A/C
compressor, makes compensation to the throttle disc angle.
Mass Airflow (MAF) sensor with
integrated Intake Air Temperature
(IAT) sensor
CKP sensor The CKP sensor is an inductive pulse generator, which scans protrusions on a pulse ring, to inform the ECM of the
ECT sensor The thermistor type sensor provides an input signal to the ECM, which is proportional to the temperature of the engine
Engine Oil Temperature (EOT)
sensor
Heated Oxygen Sensor (HO2S) 1 The HO2S 1 is a linear characteristic type sensor, fitted forward of the exhaust system's catalytic converter. The sensor is
HO2S 2 The HO2S 2 is a non-linear characteristic type sensor fitted to the exhaust system's catalytic converter, and is used by the
EGR valve A defined portion of the engine's exhaust emissions is extracted and returned to the intake mixture via a solenoid valve, as
Air intake control flap solenoid
(S/C engine)
Engine oil pressure switch This switch is connected to the Instrument Pack (IPK) and is used for a low oil pressure warning. It is not used by the
The MAF sensor informs the ECM of the rate of airflow entering the engine by producing a voltage, which increases as the
rate of airflow increases. The MAF sensor also takes into account the density of air entering the engine so it is possible to
maintain the required air fuel ratio, and compensate for variations in atmospheric pressure and temperatures. The integral
IAT sensor measures the temperature of the air entering the intake system. The ECM uses this information to compensate
for higher than normal IAT upon combustion detonation.
crankshaft's position and engine speed.
coolant being circulated around the coolant system.
The thermistor type sensor provides an input signal to the ECM, which is proportional to the temperature of the oil being
circulated around the engine oil passageways.
used by the ECM as a primary sensor to measure oxygen content within the exhaust system. The sensor is used in
conjunction with the ECM to provide closed loop fuelling control.
ECM as a secondary sensor to measure oxygen content within the exhaust system. Used in conjunction with the ECM and
the HO2S 1, the HO2S 2 aids closed loop fuelling control. It is also used to monitor catalyst efficiency.
controlled by the ECM.
The ECM directly controls the solenoid, to open and close the air intake control flap in the air cleaner assembly. The
control flap is opened at high engine speed and loads to satisfy engine air charge requirements.
engine management system.
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5 Mode $06 Data
SAE J1979 Mode $06 Data
Test ID Comp ID Description Units
$02 $00 Catalyst system efficiency below threshold 1 - bank (delay time) msec
$04 $00 Catalyst system efficiency below threshold 2 - bank (delay time) msec
Conversion for TID $02 and $04: Multiply by 4 to get result in milliseconds.
$06 $00 EVAP system leak detected (20 thou) kPa
$07 $00 EVAP system leak detected (gross leak) kPa
$08 $00 EVAP system leak detected (40 thou) kPa
Conversion for TID $06 and $08: Multiply by 6.25/1024, then subtract 4.125 to get result in kPa.
Conversion for TID $07: Multiply by 6.25/1024 to get result in kPa.
$09 $00 EGR system flow malfunction (GA changing rate low) g/sec
$0A $00 EGR system flow malfunction (GA changing rate high) g/sec
Conversion for TID $09 and $0A: Multiply by 400/65536, then subtract 200 to get result in g/sec. Result can be positive or negative.
$0B $00 EVAP system flow check None
$0C $00 EVAP system flow check None
Conversion for TID $0B and $0C: Multiply by 0.5/65536.
$0D $00 EVAP system flow check None
$0E $00 EVAP system flow check None
Conversion for TID $0D and $0E: Multiply by 2/65536.
$0F $00 EVAP system flow check rpm
$10 $00 EVAP system flow check rpm
$11 $00 EVAP system flow check rpm
Conversion for TID $0F, $10 and $11: Multiply by 100/256 to get result in RPM.
$12 $00 EVAP system flow check g/sec
Conversion for TID $12: Multiply by 1/1024 to get result in g/sec.
$13 $00 Catalyst system efficiency below threshold 1 - bank (high airflow) None
$14 $00 Catalyst system efficiency below threshold 2 - bank (high airflow) None
Conversion for TID $13 and $14: Multiply by 1.25/256
$1A $00 Upstream HO2S 11 lean to rich response time counter msec
$1B $00 Upstream HO2S 21 lean to rich response time counter msec
Conversion for TID $1A and $1B: Multiply by 64 to get result in msec.
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SAE J1979 Mode $06 Data – Continued
$1C $00 Upstream HO2S 11 minimum sensor current for test cycle mA
$1D $00 Upstream HO2S 21 minimum sensor current for test cycle mA
$1E $00 Upstream HO2S 11 maximum sensor current for test cycle mA
$1F $00 Upstream HO2S 21 maximum sensor current for test cycle mA
Conversion for TID $1C, $1D, $1E and $1F: Multiply by 1/256, then subtract 128 to get result in mA. Result can be positive or negative.
$21 $00 EGR system flow malfunction (MAP changing rate low) kPa
$22 $00 EGR system flow malfunction (MAP changing rate high) kPa
Conversion for TID $21 and $22: Multiply by 500/65536, then subtract 133.35 to get result in kPa. Result can be positive or negative.
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6 On Board Monitoring
The vehicle drive train is continually monitored throughout its life to maintain its proper function and ensure that emission levels do not exceed accepted limits.
6.1 Catalyst Efficiency Monitor
Catalytic converters oxidize unburned Hydrocarbons (HC) and Carbon Monoxide (CO) by combining them with oxygen to produce water vapor, and reduce
nitrogen oxides to nitrogen and oxygen. When the engine air fuel ratio is lean, the oxygen content of the catalytic converter reaches its maximum value. When
the air fuel ratio is rich, the oxygen content is depleted. If the air fuel ratio remains rich for an extended period, the converter may fail to convert the harmful
gases.
The Catalyst monitor operates once per trip, and is not a continuous monitor.
The monitor waits until all entry conditions are met, including the modeled catalyst temperature reaching its threshold. Once all entry conditions are met, the
monitor starts to run. The fuelling is cycled rich and lean (called dither) by approximately 3% to get a reaction at the downstream Oxygen Sensor (O2S). At the
start of the monitor, delay counters operate so that the fuelling is stable when the diagnosis takes place. If the entry conditions then drop out, the monitor result
and execution timer are held at the values that they were when the entry conditions dropped out. The next time entry conditions are met the monitor carries on
from where it stopped previously. This will happen for a maximum of four attempts, after this, the monitor will reset and the diagnosis restarts.
The monitor runs for a calibratable period of time, after which the monitor results are made. The monitor results are decided by accumulating the locus of the
downstream O2S signal versus the accumulation of the upstream O2S. The more active the downstream sensor, the less oxygen storage capacity the catalyst
has, so the higher the locus value.
With a 100,000-mile catalyst, the downstream O2S is not so active, so lower locus values are obtained.
A judgment is made when the monitor has finished. The judgment made can either be "normal" or "fail". The normal judgment is made if the accumulated count
is lower than a calibratable threshold at the judgment point. The failure judgment is made if the accumulated count equals or exceeds the calibratable threshold
at the judgment point. If a failure judgment is made, then the relevant DTCs are stored within the engine management system.
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A
A
A
A
A
A
Note: Unless specifically included in the tables below, IAT, ECT, vehicle speed and time after start up are not critical to enable these monitors.
Catalyst Monitor Operation – Up to 2004 Model Year
Strategy DTCs Description Malfunction Criteria Value Secondary Parameter Enable
Conditions
Catalyst
efficiency bank
1
Catalyst
efficiency bank
2
Disable: P0101, P0102, P0103, P0104, P0106,
Bank 1 P0031, P0032, P0037, P0038, P0137,
P0420 Ratio of locus of upstream/
downstream HO2S during
mixture dither.
P0430 IAT
ccumulative locus of
downstream sensor
> 17 Engine speed
Closed lop fuelling
ECT
irflow
tmospheric pressure
irflow change
Engine speed change
Throttle angle change
Idle
Sub feedback compensation
ir fuel ratio compensation
Linear air fuel ratio
compensation
Fuel level
1300 to 3000 RPM
ctive
75 to 120 °C
-20 to 110 °C
14 to 65 g/s
> 70.0 kPa
< 30 g/s/s
< 360 RPM/s
< 10 deg/s
Inactive
0.9 to 1.1
0.75 to 1.25
0.5 to 1.5
> 11%
P0107, P0108, P0111, P0112, P0113,
P0116, P0117, P0118, P0121, P0122,
P0123, P0125, P0128, P0222, P0223,
P0301, P0302, P0303, P0304, P0305,
P0306, P0307, P0308, P0443, P0444,
P0445, P0460, P0603, P1224, P1229,
P1251, P1313, P1314, P1316, P1367,
P1368, P1609, P1611, P1631, P1633,
P1637, P1642, P1215, P1216, P1344,
P1234, P1236, P1338, P3029
P0138, P0140, P0171, P0172, P0201,
P0203, P0205, P0207, P0351, P0353,
P0355, P0357
Time
Required
30s
2 DTC
2 DTC
MIL
Jaguar Cars Revision Date: May 2004 Page 15 of 113
A
A
A
A
Catalyst Monitor Operation – From 2004 Model Year
Strategy DTCs Description Malfunction Criteria Value Secondary Parameter Enable Conditions Time
Bank 2 P0051, P0052, P0057, P0058, P0157,
P0158, P0160, P0174, P0175, P0202,
P0204, P0206, P0208, P0352, P0354,
P0356, P0358
Catalyst
efficiency bank
1
Catalyst
efficiency bank
2
P0420 Ratio of locus of upstream/
downstream HO2S during
mixture dither.
P0430 IAT
ccumulative locus of
downstream sensor
>=14 (X-Type)
>= 16 (XK8)
>= 17 (XJ)
>= 18 (V6 SType)
Engine speed (RPM)
Closed loop fuelling
ECT
MAF
tmospheric pressure
irflow change
Engine speed change
Throttle angle change
Idle
Sub feedback control
Short term fuel trim
Total fuel trim
Fuel level
1300 to 2900 (X-Type)
1300 to 3000 (V8)
1300 to 3250 (V6 SType)
ctive
75 to 119 °C
-20 to 101 °C
-8.13 to 110 °C (XType)
10 to 65 g/s
10 to 40 g/s (X-Type)
>= 70.0 kPa
>= 75.5 kPa (X-Type
<= 30 g/s/0.512s
<=20 g/s/0.512s (XType)
<= 360 RPM/0.512s
<= 10 deg/1.024s
Inactive
0.9 to 1.1
0.75 to 1.25
0.5 to 1.5
>= 11%
30s
20s (X-Type)
2 DTC
MIL
Required
2 DTC
Jaguar Cars Revision Date: May 2004 Page 16 of 113
Catalyst Monitor Operation – From 2004 Model Year - Continued
Strategy DTCs Description Malfunction Criteria Value Secondary parameter Enable Conditions Time
Required
Disable: C1137, C1145, C1155, C1165,
C1175, P0101, P0102, P0103,
P0106, P0107, P0108, P0111,
P0112, P0113, P0116, P0117,
P0118, P0121, P0122, P0123,
P0125, P0128, P0181, P0182,
P0183, P0191, P0192, P0193,
P0222, P0223, P0441, P0443,
P0444, P0445, P0460, P0603,
P1104, P1224, P1229, P1233,
P1234, P1236, P1251, P1313,
P1314, P1316, P1338, P1339,
P1367, P1368, P1609, P1611,
P1631, P1633, P1637, P1642
Bank 1 P0031, P0032, P0037, P0038,
P0133, P0137, P0138, P0140,
P0171, P0172, P0201, P0203,
P0205, P0207, P0351, P0353,
P0355, P0357
Bank 2 P0051, P0052, P0057, P0058,
P0153, P0157, P0158, P0160,
P0174, P0175, P0202, P0204,
P0206, P0208, P0352, P0354,
P0356, P0358
Disable Additions: P0069, P0607, P0627, P0628,
P0629, P2118, P2119, P2135,
P2228, P2229, P2632, P2633,
P2634, P2635, P2636
MIL
2
DTC
2
DTC
2
DTC
2
DTC
Jaguar Cars Revision Date: May 2004 Page 17 of 113
6.2 Misfire Monitor
A misfire is caused by a failure of combustion. When this occurs, unburned HC and excess oxygen are exhausted from the cylinder. Consequently, the catalytic
converter may suffer damage through overheating as it tries to convert the excessive HC. Secondly, the O2S will report a lean condition to the ECM, which in
turn will increase the injector pulse width and add more raw fuel to the exhaust stream.
The misfire detection monitor is continuous and is designed to detect levels of misfire that can cause thermal damage to the catalyst and/or result in excessive
tailpipe emissions. Determination of a misfire is made by analysis of changes in crankshaft speed, a misfire causing a drop in acceleration after an anticipated
firing event. This data is analyzed in four ways to ensure all possible combinations of misfire can be detected.
The results of the misfire judgment process on each firing event are used to determine whether two failure levels have been met, 'catalyst damage' misfire and
'excess emissions' misfire. Each fault judgment process has its own failure threshold and calculation period.
Monitor DTCs
P0300 Random/multiple cylinder misfire
P0301 Cylinder 1 (1 bank 1) misfire
P0302 Cylinder 2 (1 bank 2) misfire
P0303 Cylinder 3 (2 bank 1) misfire
P0304 Cylinder 4 (2 bank 2) misfire
P0305 Cylinder 5 (3 bank 1) misfire
P0306 Cylinder 6 (3 bank 2) misfire
P0307 Cylinder 7 (4 bank 1) misfire (V8 engines only)
P0308 Cylinder 8 (4 bank 2) misfire (V8 engines only)
P1313 Catalyst damage misfire, bank 1
P1314 Catalyst damage misfire, bank 2
P1316 Excess emissions misfire
Jaguar Cars Revision Date: May 2004 Page 18 of 113
)
Monitoring Strategy
The misfire monitor operates continuously within the boundaries of the regulated monitor operation window, as shown below:
110
100
90
80
70
60
50
40
Relative Engine Load (%
30
20
10
0
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000
FTP75
Operating
Idle
Misfire Monitor Operating Region
(w ithin solid boundary)
Effect of 4"Hg
'P ressure R elief'
Stabilised engine, sea-level
minimum load line
Engine Speed (rpm)
Region of misfire monitor operation
After engine start, the monitor will enable as soon as the engine speed rises above the minimum operation speed (150 RPM below fully warm stabilized idle
speed). Two revolutions of crank angle data, i.e. One sample of data from each cylinder firing, are 'buffered' before any decisions can be made by the monitor.
Before engine speed has reached the top of the start flare the monitor will be ready to make misfire judgments, which are then made on every cylinder firing,
irrespective of whether the monitor is enabled or not.
Note: Unless specifically included in the tables below, IAT, ECT, vehicle speed and time after start up are not critical to enable these monitors.
Jaguar Cars Revision Date: May 2004 Page 19 of 113
A
Misfire Monitor Operation – Up to 2004 Model Year
Strategy DTCs Description Malfunction Criteria Value Secondary Parameter Enable
Conditions
Random misfire P0300 Crank speed fluctuation Catalyst damage
Excessive emissions
Misfire cylinder
1
Misfire cylinder
2
Misfire cylinder 3 P0303 IAT
Misfire cylinder 4 P0304 Fuel level
Misfire cylinder 5 P0305 MIS2 1+2 DTC
Misfire cylinder 6 P0306 1+2 DTC
Misfire cylinder
7 (V8)
Misfire cylinder
8 (V8)
Misfire catalyst
damage 1
Misfire catalyst
damage 2
Misfire excess
emissions
Disable: P0101-P0103, P1104, P0111- P0113, P0116- P0118, P0125, P0107,
P0301
P0302
P0307 1+2 DTC
P0308 1+2 DTC
P1313 Catalyst damage % See table MIS1 No
P1314 Catalyst damage % No
P1316 Emissions failure
4.2L S/C Auto
Normally aspirated
Supercharged
Steady state
Engine speed (RPM)
4.2L N/A Auto
3.0L Manual
3.0L Auto
ECT
tmospheric pressure
Load
1.3%
1.3%
No
P0108, P0336, P0460, P0603, P0121- P0123, P0137, P0138, P0140,
P0157, P0158, P0160, P0171, P0172, P0174, P0175, P0181- P0183,
P1233, P1339, P0106, P0831, P0832, P1234, P1236, P1338, P0222,
P0223, P1224, P1229, P1230, P1251, P1516, P1609, P1611, P1631,
P1633, P1637, P1642. P0128, P0106, C1137, C1165, C1175
450 - 6500
450 – 6200
580 - 7000
530 - 7000
-8 to 120°C
-8 to 100°C
> 68 kPa
> 11%
> Value in map
Time
Required
200 or 1000
revolutions
1+2 DTC
1+2 DTC
1+2 DTC
MIL
1+2 DTC
1+2 DTC
Jaguar Cars Revision Date: May 2004 Page 20 of 113
A
Misfire Monitor Operation – From 2004 Model Year
Strategy DTCs Description Malfunction Criteria Value Secondary Parameter Enable
Conditions
Random misfire
Misfire
cylinder 1
Misfire
cylinder 2
Misfire
cylinder 3
Misfire
cylinder 4
Misfire
cylinder 5
Misfire
cylinder 6
Misfire
cylinder 7 (V8)
Misfire
cylinder 8 (V8)
Misfire catalyst
damage 1
Misfire catalyst
damage 2
Misfire excess
emissions
Disable: C1137, C1145, C1155, C1165, C1175, P0101-P0103, P0106-P0108, P0111-P0113,
X-Type 2005 model year Disable additional: P0069, P0607, P0627-P0629, P0851, P2118, P2119, P2135, P2228, P2229, P2632-
P0300
P0301
P0302
P0303
P0304
P0305
P0306
P0307
P0308
P1313 Catalyst damage % See table MIS1 200 revolutions No
P1314 Catalyst damage % No
P1316 Emissions failure
Crank speed fluctuation Catalyst damage
Excessive emissions
4.2L S/C Auto (XK8)
IAT
Fuel level
MIS2
4.2L normally aspirated
4.2L supercharged
3.0L S-Type
X-Type manual
X-Type automatic
Steady state
Engine speed (RPM)
4.2L NA Auto (XK8)
4.2L NA Auto (XJ)
4.2L S/C Auto (XK8)
3.0L
ECT
tmospheric pressure
Load
1.3%
1.3%
1.3%
4.0%
2.0%
P0116-P0118, P0121-P0123, P0125, P0128, P0137, P0138, P0140, P0157, P0158,
P0160, P0171, P0172, P0174, P0175, P0181-P0183, P0191-P0193, P0222, P0223,
P0335, P0336, P0460, P0603, P0831, P0832. P1104, P1224, P1229, P1233, P1234,
P1236, P1251, P1338, P1339, P1516, P1609, P1611, P1631, P1633, P1637, P1642.
P2636
1000
450 to 6500
450 to 6200
450 to 6600
450 to 6400
530 - 7000
-8 to 119°C
-40 to 119 °C
> 68 kPa
> 75.5 kPa (XType)
> 11%
> Value in map
Time
Required
200 or 1000
revolutions
1+2 DTC
revolutions
1+2 DTC
1+2 DTC
1+2 DTC
1+2 DTC
1+2 DTC
1+2 DTC
1+2 DTC
1+2 DTC
No
MIL
Jaguar Cars Revision Date: May 2004 Page 21 of 113
6.2.1 Misfire Detection
For the purposes of misfire detection, “steady - state“ is defined as:
• At least 1 second since fuel cut-off was last invoked.
• At least 1 second since gear change was last made.
• At least 0.5 seconds since rough road detected (1second for 3.0L).
• At least 1 second since acceleration ignition retard was last invoked.
• At least 1 second since >15% shunt control ignition retard was last invoked (3.0L only).
• At least 1 second since fuel cut-off ignition retard was last invoked.
• At least 1 second since ISC feedback status (off to on only) changed.
• At least 1 second since A/C status (on or off) changed.
• At least 1 second since electrical load status (on or off) changed.
• At least 1 second since traction control ignition retard was last invoked.
• Rate of change of engine speed less than 250 RPM/0.064s.
• Rate of change of engine load has been less than 0.1g/revolution for at least 20 firing cycles.
• Rate of change of throttle angle is less than 1.5 degrees/0.008s.
MIS1 – 2.5L
Engine speed (RPM) Engine
load (g/s)
0.30 148 148 138 116 100 100 100 90 82 74 42 32 32 20 18
0.60 124 124 108 108 90 82 70 64 58 50 42 32 32 20 18
0.80 106 106 106 100 82 74 60 56 50 42 36 30 24 20 18
1.00 100 100 100 82 74 66 50 50 42 32 30 28 32 20 20
1.20 88 88 88 74 62 44 42 40 32 32 28 28 32 30 30
1.40 88 88 88 74 62 60 56 56 48 36 36 32 32 36 36
1.60 88 88 88 74 62 60 56 56 48 36 36 32 32 36 36
2.00 88 88 88 74 62 60 56 56 48 36 36 32 32 36 36
Note: The figures in the map denote the number of misfires in 200 engine revolutions corresponding to catalyst damage misfire failure.
700 730 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000
Jaguar Cars Revision Date: May 2004 Page 22 of 113
MIS1 – 3.0L (S-Type)
Engine speed (RPM) Engine
load (g/s)
680 730 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000
0.25 150 150 135 130 125 116 106 99 99 80 76 72 72 68 64
0.3 138 138 125 120 119 110 100 93 93 74 70 66 66 62 58
0.4 126 126 120 110 109 100 90 83 83 64 60 56 56 52 48
0.6 121 121 118 118 102 93 80 69 67 56 55 46 46 43 42
0.9 117 117 111 100 84 72 60 53 52 48 39 31 31 27 26
1.2 93 93 93 76 67 58 56 50 51 38 32 23 23 23 23
1.3 84 84 84 77 64 61 50 41 44 27 27 26 26 25 25
1.6 100 100 100 77 73 68 50 46 57 50 41 36 38 39 38
Note: The figures in the map denote the number of misfires in 200 engine revolutions corresponding to catalyst damage misfire failure.
MIS1 – 3.0L (X-Type)
Engine speed (RPM) Engine
load (g/s)
0.30 148 148 134 116 106 90 70 68 64 56 40 20 26 26 24
0.60 126 126 120 106 90 76 64 58 50 38 32 20 20 20 24
0.80 100 100 100 90 76 64 56 50 40 26 20 18 18 18 24
1.00 84 84 84 80 62 56 42 38 40 26 20 14 14 18 20
1.20 68 68 68 64 50 46 40 34 26 26 30 26 26 26 26
1.40 78 78 78 64 56 46 26 20 26 30 30 30 28 26 34
1.60 78 78 78 64 56 46 50 50 34 30 34 32 34 32 34
2.00 78 78 78 64 56 46 50 50 34 30 34 32 34 32 34
Note: The figures in the map denote the number of misfires in 200 engine revolutions corresponding to catalyst damage misfire failure.
700 730 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000
Jaguar Cars Revision Date: May 2004 Page 23 of 113
MIS1 – 4.2L Normally Aspirated
Engine speed (RPM) Engine
load (g/s)
600 650 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500
0.3 187 187 179 167 140 122 118 104 94 89 74 60 51 62
0.4 183 183 175 163 137 119 114 100 94 86 70 56 47 58
0.6 173 173 165 153 134 109 109 109 92 83 68 53 44 56
0.8 164 164 156 146 133 120 106 94 83 66 53 41 30 40
1.2 151 151 143 114 96 75 75 63 50 33 20 20 20 20
1.6 122 122 114 94 75 58 50 29 26 20 20 20 20 20
2.2 120 120 112 92 74 58 45 33 26 27 26 31 31 34
2.8 120 120 112 92 74 60 48 36 31 30 26 31 31 34
Note: The figures in the map denote the number of misfires in 200 engine revolutions corresponding to catalyst damage misfire failure.
MIS1 – 4.2L Supercharged
Engine speed (RPM) Engine
load (g/s)
600 650 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6200
0.4 186 186 180 164 150 134 117 101 89 77 64 68 72 74
0.6 186 186 178 160 150 130 110 97 85 73 60 64 68 70
1 183 183 175 159 142 125 108 93 77 63 49 51 52 53
1.6 158 158 150 134 117 104 90 72 54 50 46 52 57 60
2.2 125 125 117 109 100 93 85 66 47 49 52 58 64 68
2.8 122 122 114 88 62 52 42 50 57 56 56 68 80 84
3.4 116 116 108 84 60 55 50 54 58 57 57 69 74 77
3.8 116 116 108 84 60 55 50 53 61 65 70 71 73 77
Note: The figures in the map denote the number of misfires in 200 engine revolutions corresponding to catalyst damage misfire failure.
MIS2 – 2.5L Automatic
Engine speed (RPM) EOT (°C)
700 730 1000 1500 2000 2500 3000 7000
-10 0.64 0.64 0.64 0.43 0.43 0.43 0.43 0.72
20 0.39 0.39 0.39 0.33 0.33 0.33 0.34 0.63
50 0.27 0.27 0.27 0.25 0.26 0.26 0.27 0.56
80 0.22 0.22 0.22 0.20 0.22 0.22 0.23 0.52
Jaguar Cars Revision Date: May 2004 Page 24 of 113
MIS2 – 2.5L Automatic (2005 Model Year X-Type)
Engine speed (RPM) EOT (°C)
500 650 1000 1150 1380 1800 2300 2550 2760 3000 7000
-8 0.45 0.45 0.45 0.45 0.45 0.46 0.47 0.47 0.47 0.47 0.72
15 0.32 0.32 0.32 0.32 0.33 0.37 0.38 0.38 0.38 0.38 0.63
45 0.26 0.26 0.26 0.26 0.28 0.32 0.32 0.32 0.32 0.32 0.57
80 0.21 0.21 0.23 0.24 0.25 0.26 0.27 0.28 0.28 0.28 0.53
MIS2 – 2.5L Manual
Engine speed (RPM) EOT (°C)
700 730 1000 1500 2000 2500 3000 7000
-10 0.47 0.47 0.47 0.33 0.33 0.34 0.35 0.64
20 0.32 0.32 0.32 0.26 0.26 0.27 0.28 0.57
50 0.23 0.23 0.23 0.21 0.22 0.23 0.24 0.53
80 0.19 0.19 0.19 0.18 0.19 0.20 0.20 0.49
MIS2 – 2.5L Manual (2005 Model Year X-Type)
Engine speed (RPM) EOT (°C)
500 650 785 960 1165 1410 1725 2180 2700 3000 7000
-8 0.50 0.50 0.50 0.43 0.37 0.33 0.33 0.33 0.37 0.37 0.66
15 0.36 0.36 0.36 0.31 0.27 0.25 0.27 0.28 0.30 0.30 0.59
45 0.26 0.26 0.26 0.24 0.21 0.22 0.24 0.25 0.25 0.26 0.55
80 0.20 0.20 0.20 0.20 0.18 0.18 0.20 0.20 0.20 0.21 0.50
MIS2 – 3.0L S-Type Automatic
Engine speed (RPM) EOT (°C)
680 730 1000 1500 2000 2500 3000 7000
-8.1 0.599 0.599 0.599 0.523 0.504 0.504 0.504 0.832
20 0.404 0.404 0.404 0.409 0.399 0.4 0.38 0.709
50 0.34 0.33 0.32 0.32 0.32 0.32 0.35 0.678
80 0.295 0.29 0.27 0.27 0.255 0.26 0.26 0.589
Jaguar Cars Revision Date: May 2004 Page 25 of 113
MIS2 – 3.0L S-Type Manual
Engine speed (RPM) EOT (°C)
680 730 1000 1500 2000 2500 3000 7000
-8.1 0.399 0.399 0.399 0.399 0.409 0.432 0.432 0.841
20 0.32 0.32 0.33 0.335 0.335 0.34 0.361 0.77
50 0.3 0.3 0.314 0.29 0.29 0.3 0.3 0.709
80 0.275 0.275 0.27 0.25 0.245 0.25 0.25 0.659
MIS2 – 3.0L X-Type Automatic
Engine speed (RPM) EOT (°C)
700 730 1000 1500 2000 2500 3000 7000
-10 0.55 0.55 0.55 0.44 0.44 0.44 0.44 0.79
20 0.41 0.41 0.41 0.35 0.36 0.36 0.36 0.71
50 0.32 0.32 0.32 0.28 0.29 0.29 0.30 0.65
80 0.24 0.24 0.24 0.22 0.22 0.23 0.24 0.59
MIS2 – 3.0L X-Type Manual
Engine speed (RPM) EOT (°C)
700 730 1000 1500 2000 2500 3000 7000
-10 0.54 0.54 0.54 0.37 0.37 0.38 0.38 0.72
20 0.36 0.36 0.36 0.30 0.30 0.30 0.30 0.64
50 0.25 0.25 0.25 0.24 0.24 0.25 0.25 0.59
80 0.23 0.23 0.23 0.20 0.20 0.20 0.21 0.55
MIS2 – 4.2L Normally Aspirated
Engine speed (RPM) EOT (°C)
600 650 1000 1500 2000 2500 3000 6500
-8 0.45 0.45 0.45 0.45 0.46 0.46 0.46 0.88
20 0.38 0.38 0.38 0.39 0.4 0.4 0.42 0.83
50 0.31 0.31 0.31 0.32 0.33 0.33 0.34 0.75
80 0.24 0.24 0.24 0.25 0.26 0.25 0.26 0.67
Jaguar Cars Revision Date: May 2004 Page 26 of 113
MIS2 – 4.2L Supercharged
Engine speed (RPM) EOT (°C)
600 650 1000 1500 2000 2500 3000 6500
-8 0.6 0.6 0.6 0.6 0.62 0.64 0.66 1.21
20 0.5 0.5 0.5 0.51 0.51 0.52 0.54 1.09
50 0.37 0.37 0.37 0.38 0.4 0.41 0.44 0.99
80 0.28 0.28 0.28 0.28 0.29 0.31 0.35 0.9
6.3 Heated Oxygen Sensor Monitor
An O2S comprises of a gas-tight zirconium dioxide ceramic tube covered with thin layer of platinum. One end of the tube is open to atmosphere; the other end is
sealed and protrudes into the exhaust. When the tube is filled with oxygen rich atmospheric air, and the outer walls are exposed to the oxygen depleted exhaust
gases, a chemical reaction takes place and produces a voltage. The voltage output reflects the differences in oxygen concentrations on either side of the ceramic
sensor element. As the oxygen content decreases, the voltage increases. As the oxygen content increases, the voltage decreases.
The oxygen content of the exhaust gas stream is directly related to the air fuel mixture supplied to the engine. The voltage output by the O2S is typically 800 to
1000mV for rich mixtures, and around 100mV for lean mixtures.
The ceramic material in the sensor becomes sensitive to the presence of oxygen in the exhaust gas stream at around 315°C. An internal heater is used to bring
the sensor quickly up to the operating temperature.
The engine management system runs two tests on the upstream and downstream HO2S, one on the sensor operation and one on the sensor’s internal heater.
Note: Only the rear HO2S are used for fuel control.
6.3.1 Downstream Oxygen Sensors High/Low Input Monitor
The downstream O2S are checked for their maximum and minimum output values. The monitor increments an execution timer if the monitor entry conditions are
satisfied. A low voltage failure is judged if the output of the sensor does not exceed a calibrated value prior to the monitor execution timer exceeding its calibrated
failure threshold. A high voltage failure is judged if the sensor output remains above a calibrated value after the monitor execution timer has exceeded its
calibrated failure threshold or after a defined period of over run fuel cut off has been conducted. Additionally, a high voltage failure is invoked if the sensor
voltage exceeds battery short threshold for the required time.
Note: Unless specifically included in the tables below, IAT, ECT, vehicle speed and time after start up are not critical to enable these monitors.
Jaguar Cars Revision Date: May 2004 Page 27 of 113
A
A
Heated Oxygen Sensor Monitor Operation – Up to 2004 Model Year
Strategy DTCs Description Malfunction Criteria Value Secondary Parameter Enable
Downstream
HO2S bank 1
high voltage
Downstream
HO2S bank 2
high voltage
P0138 Sensor voltage stuck high Sensor voltage
P0158 Disable: See HO2S
.9 volts
During fuel cut
off, duration >
3.8s
2 volts anytime
ir fuel rate feedback
compensation:
Closed loop compensation:
Closed loop compensation
verage:
ECT:
IAT:
Time after start up
0.75 – 1.25
0.5 – 1.5
0.85 – 1.15
70 – 110 °C
-8 – 100 °C
2 seconds
downstream no
activity check.
Heated Oxygen Sensor Monitor Operation – From 2004 Model Year (XK8, S-Type and New XJ)
Strategy DTCs Description Malfunction Criteria Value Secondary Parameter Enable
Conditions
Downstream
HO2S bank 1
high voltage
Downstream
HO2S bank 2
high voltage
P0138 Sensor voltage stuck high Sensor voltage
P0158 Immediate
Disable: See HO2S downstream no activity check.
= 0.95 volts
>=2 volts anytime
During fuel cut off, duration >= 3.8s (XK8)
>= 5s (S-Type)
>= 3.5s (XJ)
Conditions
Time
Required
60s 2 DTC
2 DTC
Time
Required
3.8s (XK8)
5s (S-Type)
3.5s (XJ)
0.5s (XJ)
MIL
MIL
2 DTC
2 DTC
Jaguar Cars Revision Date: May 2004 Page 28 of 113
A
A
A
A
Heated Oxygen Sensor Monitor Operation – From 2004 Model Year (X -Type)
Strategy DTCs Description Malfunction Criteria Value Secondary Parameter Enable
Downstream
HO2S bank 1
low input
Downstream
HO2S bank 2
low input
Downstream
HO2S bank 1
high input
Downstream
HO2S bank 2
high voltage
P0137 Sensor voltage stuck low Sensor voltage
P0157
P0138 Sensor voltage stuck high Sensor voltage
or
P0158 Sensor voltage > 1.24 volts
Disable: See HO2S downstream no activity check.
0.30 volts Heater control
HO2S heater power
Engine speed
MAF
tmospheric pressure
Target Lambda
ECT
IAT
> 0.80 volts Time after start
Closed loop fuelling
Over run fuel cut off time
nytime 0.5s 2 DTC
ctive
>=180 Watt sec
>= 1500 RPM
>= 15 g/s
>= 74.5 kPa
0.75 to 1
70 to 119 °C
-10 to 119°C
>= 30s
ctive
>= 30s (high I/P)
Conditions
Time
Required
151s 2 DTC
2 DTC
151s 2 DTC
6.3.2 Downstream Oxygen Sensors Heater Circuit High
Heater resistance checks are performed when the heater is commanded on. If resistance values are outside of the limits when the heater is enabled, then a
failure judgment is made.
Note: Unless specifically included in the tables below, IAT, ECT, vehicle speed and time after start up are not critical to enable these monitors.
Heated Oxygen Sensor Monitor Operation
Strategy DTCs Description Malfunction Criteria Value Secondary Parameter Enable
Heater control
circuit bank 1
high input
Heater control
circuit bank 2
downstream
high input
P0038 Heater resistance check when
on
P0058 Heater resistance when on Outside limits
Outside limits 0.432s
Disable:
P1609, P0603
Conditions
Time
Required
0.4s (2004
model year)
0.432s
0.4s (2004
model year)
2 DTC
2 DTC
MIL
MIL
Jaguar Cars Revision Date: May 2004 Page 29 of 113
6.3.3 Downstream Oxygen Sensors Heater Circuit Low
Heater resistance checks are performed when the heater is commanded off. If resistance values are outside of the limits, then a failure is flagged.
Note: Unless specifically included in the tables below, IAT, ECT, vehicle speed and time after start up are not critical to enable these monitors.
Heated Oxygen Sensor Monitor Operation
Strategy DTCs Description Malfunction Criteria Value Secondary Parameter Enable
Conditions
Heater control
circuit bank 1
low input
Heater control
circuit bank 2
low input
Disable: P1609, P0603
P0037 Heater resistance check when
off
P0057 Heater resistance check when
off
Outside limits 0.384s
Outside limits 0.384s
Time
Required
0.4s (2004
model year)
0.4s (2004
model year)
MIL
2 DTC
2 DTC
6.3.4 Downstream Oxygen Sensors No Activity Detected
The monitor is single shot monitor (runs once per trip), which is designed to operate only when the sensor has been lit off (up to operating temperature). The
monitor can be sub divided into two sections:
Stuck low
(Output voltage less than calibrated threshold (0.4 volts).
The monitor initially examines the fuelling control to ensure the system is stable, that linear airflow rate closed loop control, and sub feedback execution has been
invoked. Once these conditions are satisfied and a calibrated load/airflow has been achieved, a lean stuck timer is incremented. The monitor then checks the
output voltage from the sensor and sets a normal end judgment if a calibrated change in sensor output voltage is observed. If the change in sensor voltage is not
detected and the lean stuck timer exceeds the failure threshold, and the associated failure conditions are satisfied, then a failure end judgment is made.
Stuck high
(Output voltage greater than calibrated threshold (0.4 volts).
Again, the monitor strategy checks for stable air fuel ratio control prior to commencing the examination of the sensors output voltage. The monitor then utilizes
the lean switching characteristics of the sensor during an over run fuel cut off (where the sensors output voltage tends towards 0 volts), to determine its correct
Jaguar Cars Revision Date: May 2004 Page 30 of 113
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