1998 JAGUAR X308 temperatur sensor

Exhaus
t leak
Low e

xhaust temperature
Cat

alyst monitor sensor failure
P0151Le

ft-hand H02S sense circuit low
voltage
H02
S disconnected
H0

2S to ECM wiring open circuit
H0

2S short circuit to ground
H0

2S failure
F
or left-hand HO2S circuit tests, GO
to Pinpoint Test H.
.
P0152Le
ft-hand H02S sense circuit high
voltage
H02
S sensing circuit short circuit to
high voltage
H0
2S ground braided shield open
circuit
H0
2S failure
F
or left-hand HO2S circuit tests,GO to
Pinpoint Test H.
.
P0153Le
ft-hand H02S sense circuit slow
response
Engine
misfire
H02

S disconnected
H0

2S mechanical damage
H0

2S to ECM wiring intermittent
open circuit
H02
S sensing circuit short circuit to
high voltage
H0
2S short circuit to ground
H0

2S ground braided shield open
circuit
H0
2S heater circuit fault
Exhaus

t leak
Low e

xhaust temperature
Injector fl

ow partially blocked
Catal

yst efficiency decrease
H0

2S failure
Chec
k for 'engine misfire detected'
DTCs. For HO2S circ uit tests, GO to
Pinpoint Test H.
. Check for exhaust
leak
s,
REFER to Section 309
-00
Exhaust
Sy

stem
.
Chec
k injectors,
REFER to Section 303
-04
Fuel
Charging and Con

trols
.
P0155Left-hand H02S heater

circuit
malfunction
H02
S disconnected
H0

2S heater power supply open
circuit
H0
2S heater to ECM wiring short
circuit or open circuit
H0
2S heater failure
F
or left-hand HO2S heater circuit
tests,GO to Pinpoint Test I.
.
P0157Le
ft-hand catalyst monitor sensor
sense circuit low voltage
Catal
yst monitor sensor
disconnected
Catal
yst monitor sensor to ECM
wiring open circuit
Catal
yst monitor sensor short
circuit to ground
Cat
alyst monitor sensor failure
F
or left-hand catalyst monitor sensor
circuit tests,GO to Pinpoint Test J.
.
P0158Le
ft-hand catalyst monitor sensor
sense circuit high voltage
Catal
yst monitor sensor sensing
circuit short circuit to high voltage
Catalyst
monitor sensor ground
braided shield open circuit
Cat
alyst monitor sensor failure
F
or left-hand catalyst monitor sensor
circuit tests,GO to Pinpoint Test J.
.
P0160Le
ft-hand catalyst monitor sensor
sense circuit no activity
Catal
yst monitor sensor
disconnected
Catal
yst monitor sensor
mechanical damage
Catal
yst monitor sensor to ECM
wiring open circuit
Catal
yst monitor sensor sensing
circuit short circuit to high voltage
Catal
yst monitor sensor short
circuit to ground
Catalyst
monitor sensor ground
braided shield open circuit
Exhaus
t leak
Low e

xhaust temperature
Cat

alyst monitor sensor failure
F
or left-hand catalyst monitor sensor
circuit tests,GO to Pinpoint Test J.
.
Check f
or exhaust leaks,
REFER to Section 309
-00
Exhaust
Sy

stem
.
P0171Right

-hand cylinders combustion
too lean
Air
intake leak between MAF senso
r and th

rottle
F

uel filter system blockage
F

uel injector blockage
F

uel pressure regulator failure (low

fuel pressure)
Low f
uel pump output
Check ai
r intake system for leaks,
REFER to Section 303
-1
2 Intake Air
Distribu

tion and Filtering
.
Check the fuel fi
lter,
REFER to Section 310
-01
Fuel Tank
and Lines.
Chec
k the fuel injectors and fuel

St
eering wheel cassette reel short
circuit to ground
Cassette reel to ECM c
ircuit short
circuit to ground
CANC EL

switch failure (stuck ON)
Control.
P0567Cruise (speed) contr
o
l
RESUME
switch ON fault
Cru i
se (speed) control switches
internal steering wheel short circuit
to ground
S t
eering wheel cassette reel short
circuit to ground
Cassette reel to ECM c
ircuit short
circuit to ground
RESUME s
witch failure (stuck ON)
For cru
i
se (speed) control circuit tests,


REFER to Section 310
-03 Sp
eed
Control.
P0568Cru
i
se (speed) control switch
ground malfunction
Cru i
se (speed) control switches
internal steering wheel open circuit
St
eering wheel cassette reel open
circuit or high resistance
Cassette reel to ECM ci
rcuit
ACCEL/DECEL open circuit or high
resistance
ACC E
L/DECEL
switch failure
For crui
se (speed) control circuit tests,


REFER to Section 310
-03 Sp
eed
Control.
P0569Cruise (speed) contr
o
l
DECEL/SET (SET-) switch ON
fault
Cru i
se (speed) control switches
internal steering wheel short circuit
to ground
S t
eering wheel cassette reel short
circuit to ground
Cassette reel to ECM c
ircuit short
circuit to ground
DECE
L/SET
switch failure (stuck
ON)
For cru i
se (speed) control circuit tests,


REFER to Section 310
-03 Sp
eed
Control.
P0570Cruise (speed) contro

l
ACCEL/SET (SET+) switch ON
fault
Crui
se (speed) control switches
internal steering wheel short circuit
to ground
S t
eering wheel cassette reel short
circuit to ground
Cassette reel to ECM c
ircuit short
circuit to ground
ACC E
L/SET
switch failure (stuck
ON)
For crui
se (speed) control circuit tests,


REFER to Section 310
-03 Sp
eed
Control.
P0603ECM dat
a
corrupted
ECM failu
r
e
Contact deal
er techni
cal support for
advice on possible ECM failure.
P1000 Sy
stem checks not complete since
last memory clear
O B
D diagnostic monitors have not
completed
Carr y out comprehensi
ve component
monitor drive cycle. Refer to the DTC
section of JTIS.
P1104Mass ai r fl
ow (MAF) sensor ground
malfunction
MAF sensor to EC
M reference
ground circuit open circuit, short
circuit to high voltage, high
resistance
MAF s
ensor to ECM sensing circuit
open circuit
MAF sensor fai
lure
For MAF
se
nsor circuit tests,GO to
Pinpoint Test A.
.
P1111Syst
em checks complete since last
memory clear
O B
D diagnostic monitors have completed
N
o
action necessary.
P1112In
t
ake air temperature (IAT)
sensor 2 sense circuit high voltage
(low charge air temperature)
IAT sensor 2 di sconnect
ed
IAT sensor 2

to ECM sensing circuit
high resistance, open circuit or
short circuit to high voltage
IAT se nsor 2 failure

F
or IAT sensor
2 circuit tests,GO to
Pinpoint Test Q.
.
P1113Int
ake air temperature (IAT)
sensor 2 sense circuit low voltage
(high charge air temperature)
Supercharger interco
oler failure
IAT se
nsor 2
to ECM sensing circuit
short circuit to ground
IAT se nsor 2 failure

F
or IAT sensor
2 circuit tests,GO to
Pinpoint Test Q.
.
P1121Accele
rator pedal position (APP)
sensor circuit 'A'
range/performance
A P
P sensor to ECM sense circuit
'A' (sensor pin 5) open circuit,
short circuit or high resistance
Sensor power su pply fault

Sensor r
e
ference ground fault
APP s
e
nsor failure
For APP
sen
sor circuit tests,GO to
Pinpoint Test R.
, andGO to Pinpoint

Test S.
.

Yes
R
EPAIR the short circuit. For addi
tional information, refer to the wiring diagrams. CLEAR the DTC.
TEST the system for normal operation.
No GO to A3
.
A3: CHECK THE MAF SENSO
R SENS
E CIRCUIT FOR SHORT TO GROUND
• NO
TE: The short to GROUND may be intermittent. Move the
wiring to attempt to reproduce the conditions under which
the DTC was logged, and visually inspect the harness for any signs of chafing, see "visual inspection chart".
Turn the ignition swit
ch to the OFF
position.
1
Measure t
he resistance between PI35, pin 02 (GY) and GROUND.
2
Is t

he resistance less than 10,000 ohms?
Yes REPAIR the short circuit. For addi tional information, refer to the wiring diagrams. CLEAR the DTC.
TEST the system for normal operation.
No GO to A4
.
A4: CHEC K THE MA
F SENSOR SUPPLY CIRCUIT VOLTAGE
Re
conn
ect the ECM electrical connector, EM12.
1
Turn the ignition swi
t
ch to the ON
position.
2
Me
asure the voltage between the MAF sensor electrical connector, PI35, pin 01 (WU) and GROUND.
3
Is the vol
t
age greater than 10 volts?
Yes GO to A5
.
No
REP
AIR the circuit between the MAF sensor electric
al connector, PI35, pin 01 (WU) and BATTERY. This
circuit includes the EMS control rela y, fuse 12 of the EMS fuse board, and splices in the harness. For
additional information, refer to the wiring diagrams. CLEAR the DT C. TEST the system for normal
operation.
A5: CHECK THE MAF SENSO
R SUPPLY CIRCUIT FOR HIGH RESISTANCE
Di
sc
onnect the battery negative terminal.
1
Di
sc
onnect the EMS fuse board electrical connector, EM20.
2
Meas
ure t
he resistance between EM20,
pin 10 (WU) and PI35, pin 01 (WU).
3
Is the res
istance greater than 5 ohms?
Yes REPAIR the high resistance circuit. For additional information, refer to the wiring diagrams. CLEAR the
DTC. TEST the system for normal operation.
No INSTALL a new MAF sensor.
REFER to Mass Air Flow (MAF) Sensor
in this
section.
CLEAR the DTC. TEST the system for normal operation.
P INPOINT TES
T B : DTC P0111, P0112, P0113;
INTAKE AIR TEMPERATURE (IAT) SENSOR
RANGE/PERFORMANCE, HIGH/LOW VOLTAGE
•
NOTE: Before commencing this
test, check the air filter for blockage and the engine air intake and breather systems for
leaks.
TE S
T
CONDITIONS
D E
TAILS/RESULTS/ACTIONS
B1: CHECK
THE IAT SENSOR
SENS
E CIRCUIT FOR HIGH RESISTANCE
Disc
onnect the battery negative terminal.
1
D
i
sconnect the ECM electrical connector, EM12.
2
Di
sc
onnect the MAF sensor electrical connector, PI35.
3
Me
asure
the resistance between EM12, pin 12 (UP) and PI35, pin 03 (UP).
4
Is th
e res
istance greater than 5 ohms?
Yes REPAIR the high resistance circui t. For additional information, refer to the wiring diagrams. CLEAR
the DTC. TEST the system for normal operation.
No GO to B2
.
B2: CHECK
THE IAT SENSOR SENSE CIRCUIT FOR SHORT TO HIGH VOLTAGE
R
e
connect the battery negative terminal.
1
Turn the ignition swi
t
ch to the ON
position.
2
Measure the voltage between PI 35,
pin 03 (UP) and GROUND.
3

Is th
e voltage greater than 3 volts?
Yes REPAIR the short circuit. For addi tional information, refer to the wiring diagrams. CLEAR the DTC.
TEST the system for normal operation.
No GO to B3
.
B3: CHECK
THE IAT SENSOR SENS
E CIRCUIT FOR SHORT TO GROUND
Turn the ignition swi
tch to the OFF
position.
1
Meas
ure the resistance between PI35, pin 03 (UP) and GROUND.
2
Is

the resistance less than 10,000 ohms?
Yes
REPAIR the short circuit. For addi tional information, refer to the wiring diagrams. CLEAR the DTC.
TEST the system for normal operation.
No INSTALL a new MAF sensor.
REFER to Mass Air Flow (MAF) Sensor

in this section.
CLEAR the DTC. TEST the system for normal operation.
PI
NPOINT TEST C : DTC P0116, P0117, P0118
; ENGINE COOLANT TEMPERATURE (ECT) SENSOR
RANGE/PERFORMANCE, HIGH/LOW VOLTAGE
•
NOTE: Before commencing this
test, check the coolant level and condition, check the operation of the thermostat, rectify
as necessary.
TE
ST
CONDITIONS
D
ETAILS/RESULTS/ACTIONS
C1: CHECK THE ECT SEN

SOR SENS
E CIRCUIT FOR HIGH RESISTANCE
Di
sconnect the battery negative terminal.
1
D

isconnect the ECM electrical connector, EM11.
2
D

isconnect the ECT sensor electrical connector, PI04.
3
Meas

ure the resistance between EM11, pin 09 (UY) and PI04, pin 02 (UY).
4
Is th

e resistance greater than 5 ohms?
Yes
REPAIR the high resistance circui t. For additional information, refer to the wiring diagrams. CLEAR
the DTC. TEST the system for normal operation.
No GO to C2
.
C2: CHECK THE ECT SEN
SOR SENSE CI
RCUIT FOR SHORT TO HIGH VOLTAGE
R
econnect the battery negative terminal.
1
Turn the ignition swi

tch to the ON
position.
2
Meas
ure the voltage between PI04, pin 02 (UY) and GROUND.
3
Is th

e voltage greater than 3 volts?
Yes REPAIR the short circuit. For addi tional information, refer to the wiring diagrams. CLEAR the DTC.
TEST the system for normal operation.
No GO to C3
.
C3: CHECK THE ECT SEN
SOR SENSE CIRCUIT FOR SHORT TO GROUND
Turn the ignition swi

tch to the OFF
position.
1
Meas
ure the resistance between PI04, pin 02 (UY) and GROUND.
2
Is

the resistance less than 10,000 ohms?
Yes REPAIR the short circuit. For addi tional information, refer to the wiring diagrams. CLEAR the DTC.
TEST the system for normal operation.
No INSTALL a new ECT sensor. REFER to Section 303
-0
3A Engine Cooling
/
30
3
-0
3B Supercharger
Coo

ling
. CLEA
R the DTC. TEST the sy
stem for normal operation.
P
INPOINT TEST D : DTC P0121, P0122,
P0123; THROTTLE POSITION (TP) SENSOR
RANGE/PERFORMANCE, HIGH/LOW VOLTAGE
TE
ST
CONDITIONS
D
ETAILS/RESULTS/ACTIONS
D1: CHECK

THE TP SENSOR SENS
E CIRCUIT FOR HIGH RESISTANCE
Di
sconnect the battery negative terminal.
1

P3: CHECK
THE EMS SWITCHED
POWER SUPPLIES TO THE ECM
D
isconnect the ECM electrical connector, EM14.
1
Make sure the EMS re
lay i
s energized.
2
Meas

ure the voltage between EM10, pin 01 (WR) and GROUND.
3
Meas

ure the voltage between EM14, pin 03 (WR) and GROUND.
4
Are both

voltages greater than 10 volts?
Yes Contact Dealer technical support for advice on possible ECM failure.
No REPAIR the EMS switched power supply circuits. The su pply circuit to EM10, pin 01 includes fuse 18 of
the right-hand heelboard fuse box, the supply circuit to EM14, pin 03 includes fuse 01 of the trunk
fuse box. For additional information, refer to th e wiring diagrams. CLEAR the DTC. TEST the system
for normal operation.
PI
NPOINT TEST Q : DTC P1112, P1113; INTAKE
AIR TEMPERATURE (IAT) SENSOR #2 SENSE
CIRCUIT HIGH/LOW VOLTAGE
TE
ST
CONDITIONS
D
ETAILS/RESULTS/ACTIONS
Q1:

CHECK IAT SENSOR 2 SENSE CIRCUIT FOR HIGH RESISTANCE
Di

sconnect the battery negative terminal.
1
Di

sconnect the IAT sensor 2 electrical connector, PI03.
2
D

isconnect the ECM electrical connector, EM12.
3
Me

asure the resistance between PI03, pin 02 (UP) and EM12, pin 07 (UP).
4
Is th

e resistance greater than 5 ohms?
Yes REPAIR the high resistance circui t. For additional information, refer to the wiring diagrams. CLEAR
the DTC. TEST the system for normal operation.
No GO to Q2
.
Q2: CH
ECK IAT SENSOR 2 SENSE CIRC
UIT FOR SHORT TO HIGH VOLTAGE
R
econnect the battery negative terminal.
1
Turn the ignition swi

tch to the ON
position.
2
Measure the
voltage between PI
03, pin 02 (UP) and GROUND.
3
Is th
e voltage greater than 3 volts?
Yes REPAIR the short circuit. For addi tional information, refer to the wiring diagrams. CLEAR the DTC.
TEST the system for normal operation.
No GO to Q3
.
Q3:
CHECK IAT SENSOR 2 SENSE CIRCUIT FOR SHORT TO GROUND
Turn the ignition swi

tch to the OFF
position.
1
Meas
ure the resistance between PI03, pin 02 (UP) and GROUND.
2
Is

the resistance less than 10,000 ohms?
Yes REPAIR the short circuit. For addi tional information, refer to the wiring diagrams. CLEAR the DTC.
TEST the system for normal operation.
No INSTALL a new IAT sensor 2. CLEAR the DTC. TEST the system for normal operation.
P
INPOINT TEST R : DTC P1121, P1122, P1123;
ACCELERATOR PEDAL POSITION (APP) SENSOR
CIRCUIT "A" RANGE/PERFORMANCE, HIGH/LOW VOLTAGE
TE
ST
CONDITIONS
D
ETAILS/RESULTS/ACTIONS
R1: CHECK THE APP

SENSOR SENSE CIRCUIT FOR HIGH RESISTANCE
Di

sconnect the battery negative terminal.
1
D

isconnect the ECM electrical connector, EM11.
2
Di

sconnect the APP sensor electrical connector, PI42.
3
Meas

ure the resistance between EM11, pin 16 (K) and PI42, pin 05 (K).
4
Is th

e resistance greater than 5 ohms?
Yes REPAIR the high resistance circui t. For additional information, refer to the wiring diagrams. CLEAR

El
ectronic Engine Controls - En
gine Coolant Temperature (ECT)
Sensor4.0L NA V8 - AJ 27/3.2L NA V8 - AJ26
Remo
val and Installation
Remova

l
Installation
1. Op
en the engine compartment and fit paintwork protection
sheets.

2. Re
move the engine covers.

3. WA
RNING: ENSURE THAT THE ENGINE IS COLD BEFORE
COMMENCING WORK.
Slacken the coolant reservoir ca p to relieve coolant pressure
and re-tighten.

4. Remove t
he engine coolant temperature sensor.
1. Disconnect the harness plug from the sensor.
2. Remove the sensor and sealing washer.
1. Fitting is the reverse of the removal procedure, noting that a
new sealing washer should be us ed and tighten the sensor as
specified

El
ectronic Engine Controls - En
gine Coolant Temperature (ECT)
Sensor4.0L SC V8 - AJ26
Re mo
val and Installation
Remova

l
Installation

1.
Op
en the engine compartment and fit paintwork protection
sheets.

2. WA
RNING: ENSURE THAT THE ENGINE IS COLD BEFORE
COMMENCING WORK.
Slacken the coolant reservoir ca p to relieve coolant pressure
and re-tighten.

3. Remove t
he engine coolant temperature sensor.
1. Disconnect the harness plug from the sensor.
2. Remove the sensor and sealing washer.

1. Fi
tting is the reverse of the removal procedure, noting that a
new sealing washer should be us ed and tighten the sensor as
specified
2. Check and adjust the cool ant level as required.

E
lectronic Engine Controls - Inta
ke Air Temperature (IAT) Sensor
Re
moval and Installation
Remov

al
Installation


1.
Di
sconnect sensor connector at
rear of bank 1 charge air
cooler.

2. Re
move sensor.
Re

move sensor using a deep socket.
Discard sealin

g washer.
1. Installation is a reversal of the removal procedure.