1998 JAGUAR X308 check engine

the DT
C. TEST the system for normal operation.
No GO to R2
.
R2: CHECK TH
E APP 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
Me
asure the voltage between PI42, pin 05 (K) and GROUND.
3
Is th
e volt
age 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 R3
.
R3: CHECK THE APP SENSOR SENS
E CIRCUIT FOR SHORT TO GROUND
Turn the ignition swi
t
ch to the OFF
position.
1
Me
asure the resistance between PI42, pin 05 (K) 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 R4
.
R4: CHECK THE APP SENSOR COM
MON
REFERENCE VOLTAGE AT THE SENSOR
Reconn
ect the ECM electrical connector, EM11.
1
Turn the ignition swi
t
ch to the ON
position.
2
Measure t
he voltage between PI42, pin 04 (UW) and GROUND.
3
Is th
e volt
age less than 4 volts?
Yes GO to R5
.
No
GO to R6
.
R5: CHECK THE APP SENSOR COM
M
ON REFERENCE VOLTAGE CIRCUIT
Turn the ignition swit
ch to the OFF
position.
1
Di
sconnect the ECM electrical connector, EM11.
2
Measure t

he resistance between EM11,
pin 08 (UW) and PI42, pin 04 (UW).
3
Is the 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 Check the ECM power supplies.
REFER to Electronic Engine Controls
in this
section.
R6: CHECK THE APP
SENSOR COM
MON REFERENCE GROUND
Meas
ure t
he resistance between PI42, pin 02 (BG) and GROUND.
1
Is th
e res
istance greater than 5 ohms?
Yes GO to R7
.
No
INST
ALL a new APP sensor. CLEAR the DTC.
TEST the system for normal operation.
R7: CHECK THE APP SENSOR COM
MON REFERENCE GROUND CIRCUIT
D
i
sconnect the ECM electrical connectors, EM10 and EM11.
1
Measure t

he resistance between EM10,
pin 20 (BG) and PI42, pin 02 (BG).
2
Measure t
he resistance between EM11,
pin 12 (BG) and PI42, pin 02 (BG).
3
Is either 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 Check the ECM GROUND circuits. If the GROUND circuits are sound, contact dealer technical
support for advice on possible ECM failure.
PINPO
INT TEST S : DTC P1221, P1222, P1223;
ACCELERATOR PEDAL POSITION (APP) SENSOR

CIRCUI
T 'B' RANGE/PERFORMANCE, HIGH/LOW VOLTAGE
TE
ST
CONDITIONS
D
ETAILS/RESULTS/ACTIONS
S1: 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 15 (R) and PI42, pin 03 (R).
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 S2
.
S
2: CHECK THE APP SENSOR SENSE CIRCUIT FOR SHORT TO HIGH VOLTAGE
R

econnect the battery negative terminal.
1
Turn the ignition swi

tch to the ON
position.
2
M
easure the voltage between PI42, pin 03 (R) 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 S3
.
S
3: CHECK THE APP SENSOR SENSE CIRCUIT FOR SHORT TO GROUND
Turn the ignition swi

tch to the OFF
position.
1
Meas
ure the resistance between PI42, pin 03 (R) 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 GO to S4
.
S4:
CHECK THE APP SENSOR COMMON REFERENCE VOLTAGE AT THE SENSOR
Re

connect the ECM electrical connector, EM11.
1
Turn the ignition swi

tch to the ON
position.
2
Meas
ure the voltage between PI42, pin 04 (UW) and GROUND.
3
Is th

e voltage less than 4 volts?
Yes GO to S5
.
No

GO to S6
.
S5: CHECK
THE APP SENSOR COMM
ON REFERENCE VOLTAGE CIRCUIT
Turn the ignition swi
tch to the OFF
position.
1
Di
sconnect the battery negative terminal.
2
D

isconnect the ECM electrical connector, EM11.
3
Meas

ure the resistance between EM11,
pin 08 (UW) and PI42, pin 04 (UW).
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 Check the ECM power supplies.
REFER to Electronic Engine Controls

in this section.
S6: CHECK

THE APP SENSOR COMMON REFERENCE GROUND
Meas

ure the resistance between PI42, pin 02 (BG) and GROUND.
1
Is th

e resistance greater than 5 ohms?
Yes GO to S7
.
No

INSTALL a new APP sensor. CLEAR the DTC. TEST the system for normal operation.
S7: CHECK
THE APP SENSOR COMM
ON REFERENCE GROUND CIRCUIT

Is the res
istance greater than 5 ohms?
Yes GO to W10
.
No
GO to W11
.
W10 :
CHECK THE IAT SENSOR REFERENCE
GROUND CIRCUIT FOR HIGH RESISTANCE
Di
sconnect the ECM electrical connectors, EM10 and EM11.
1
Meas
ure t
he resistance between PI35,
pin 04 (BG) and EM10, pin 20 (BG).
2
Measure t
he resistance between PI35,
pin 04 (BG) and EM11, pin 12 (BG).
3
Is either resistance 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 GO to W11
.
W11 :
CHECK THE SENSOR REFERENCE GROUND AT THE IAT SENSOR #2
Re
conn
ect the ECM electrical connectors, EM10 and EM11.
1
Di
sc
onnect the IAT sensor 2 electrical connector, PI03.
2
Meas
ure t
he resistance between PI03, pin 01 (BG) and GROUND.
3
Is th
e res
istance greater than 5 ohms?
Yes GO to W12
.
No
CHECK
for DTCs associated with TP sensor, APP/
mechanical guard sensor, FTP sensor, ECT sensor,
IAT sensor, or IAT sensor 2. INST ALL a new sensor as indicated by the DTC. CLEAR the DTC. TEST
the system for normal operation.
W12 :
CHECK THE IAT SENSOR #2 REFERENC
E GROUND CIRCUIT FOR HIGH RESISTANCE
Di
sconnect the ECM electrical connectors, EM10 and EM11.
1
Meas
ure t
he resistance between PI03,
pin 01 (BG) and EM10, pin 20 (BG).
2
Measure t
he resistance between PI03,
pin 01 (BG) and EM11, pin 12 (BG).
3
Is either resistance 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 CHECK for DTCs associated with TPS, APP/mechanical guard sensor, FTP sensor, ECT sensor, IAT
sensor, or IAT sensor #2. INSTALL a new sensor as indicated by the DTC. CLEAR the DTC. TEST the
system for normal operation.
PINPO
INT TEST X : DTC P1245, P1246; ENGINE CRANK SIGNAL LOW/HIGH VOLTAGE
TE
S
T
CONDITIONS
D E
TAILS/RESULTS/ACTIONS
X
1
: CHECK THE STARTER RELAY SIGNAL CIRC
UIT FROM ECM AND BPM FOR SHORT TO B+
Re
move the starter relay.
1
Meas
ure t
he voltage between the
relay base, pin 02 and GROUND.
2
Is the volt
age 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 X2
.
X2
: CHECK THE STARTER RELAY SIGNAL CIRCUI
T FROM ECM AND BPM FOR HIGH RESISTANCE
Di
sconnect the ECM electrical connector, EM11.
1
Disc
onne
ct the BPM electrical connector, FC15.
2
Meas
ure t
he resistance between EM11, pin 06
(GO) and the starter relay base, pin 02.
3
Measure t
he resistance between FC15, pin 73
(GO) and the starter relay base, pin 02.
4
Is either 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 INSTALL a new BPM. CLEAR the DTC. TEST the system for normal operation.

AA1: CHECK THE RA
DIATOR FAN MODULE TO ECM
'SERIES' DRIVE CIRCUIT FOR HIGH RESISTANCE
Disc
onnect the battery negative terminal.
1
D
i
sconnect the ECM electrical connector, EM13.
2
Disc
onne
ct the fan module electrical connector, LS31.
3
Meas
ure t
he resistance between EM13, pin 15 (W) and LS31, pin 09 (W).
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 AA2
.
AA2: CHECK THE RA
DIATOR FAN MODULE TO ECM 'SER
IES' DRIVE CIRCUIT FOR SHORT TO HIGH VOLTAGE
Re
connect the battery negative terminal.
1
Turn the ignition swit

ch to the
ON position.
2
Measure t
he voltage between EM13, pin 15 (W) and GROUND.
3
Is the volt

age 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 AA3
.
AA3: CHECK THE R A
DIATOR FAN MODULE TO ECM
'SERIES' DRIVE CIRCUIT FOR SHORT TO GROUND
Turn the ignition swit
ch to the
OFF position.
1
Meas ure t
he resistance between EM13, pin 15 (W) 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 AA4
.
AA4:
CHECK THE RADIATOR FAN MODULE IGNITION SUPPLY
Reconn

ect the ECM electrical connector, EM13.
1
Turn the ignition swit

ch to the
ON position.
2
Measure the voltage between LS 31,
pin 08 (WP) and GROUND.
3
Is the vol
t
age greater than 10 volts?
Yes INSTALL a new radiator fan module. REFER to Section 303
-03
A Engine Cooling
/
303-03B Supercharger Cooli
ng
. CLEA
R the DTC. TEST the sy stem f
or normal operation.
No REPAIR the circuit. This circui t includes the EMS fuse box, (f use 14), the EMS relay, etc. For
additional information, refer to the wiring diagrams. CLEAR the DT C. TEST the system for normal
operation.
PINPOINT TE ST
AB : DTC P1476; RADIATOR
FANS FAST (PARALLEL) CIRCUIT MALFUNCTION
TES
T
CONDITIONS
D E
TAILS/RESULTS/ACTIONS
AB1
:
CHECK THE RADIATOR FAN MODULE TO ECM
'PARALLEL' DRIVE CIRCUIT FOR HIGH RESISTANCE
Disc
onnect the battery negative terminal.
1
D
i
sconnect the ECM electrical connector, EM13.
2
Disc
onne
ct the fan module electrical connector, LS31.
3
Meas
ure t
he resistance between EM13, pin 16 (WU) and LS31, pin 07 (WU).
4
Is th
e 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 GO to AA2
.
AB2:
CHECK THE RADIATOR FAN MODULE TO ECM 'PARALLEL' DRIVE 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 t
he voltage between EM13, pin 16 (WU) 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 AB3
.
AB3
: CHECK THE RADIATOR FAN MODULE TO ECM
'PARALLEL' DRIVE CIRCUIT FOR SHORT TO GROUND
Turn the ignition swi
tch to the OFF
position.
1
Meas
ure the resistance between EM13, pin 16 (WU) 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 GO to AA4
.
AB4
: CHECK THE RADIATOR FAN MODULE IGNITION SUPPLY
Re

connect the ECM electrical connector, EM13.
1
Turn the ignition swi

tch to the ON
position.
2
Measure the
voltage between LS
31, pin 08 (WP) and GROUND.
3
Is the vol
tage greater than 10 volts?
Yes INSTALL a new radiator fan module. REFER to Section 303
-0
3A Engine Cooling
/
30
3
-03
B
Supercharger

Cooling
. CLEA
R the DTC. TEST the sy
stem for normal operation.
No REPAIR the circuit between LS31, pin 08 (WP) and battery. This circuit includes the EMS fuse box-
(fuse 14), the EMS relay, etc. For additional information, refer to the wiring diagrams. CLEAR the
DTC. TEST the system for normal operation.
P
INPOINT TEST AC : DTC P1516, P1517; GEAR
CHANGE PARK/NEUTRAL DRIVING MALFUNCTION
TE
ST
CONDITIONS
D
ETAILS/RESULTS/ACTIONS
AC1: CH

ECK THE TRANSMISSION RANGE (TR) SE
NSOR TO ECM CIRCUIT FOR HIGH RESISTANCE
Di
sconnect the battery negative terminal.
1
Di

sconnect the TR sensor el
ectrical connector, EM47.
2
D
isconnect the ECM electrical connector, EM10.
3
Meas

ure the resistance between EM47, pin K (RU) and EM10, pin 15 (RU).
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 AC2
.
AC2: CH
ECK THE TRANSMISSION RANGE (TR)
SENSOR PARK/NEUTRAL SWITCHING ACTION
Meas
ure the resistance between pi
ns J and K of the TR sensor.
1
Mo
ve the selector lever from
PARK to NEUTRAL and back.
2
D
oes the resistance switch between open ci
rcuit and continuity as the lever moves?
Yes GO to AC3
.
No

INSTALL a new transmission range sensor. CLEAR th e DTC. TEST the system for normal operation.
AC3: CH
ECK THE D-4 SWITCH TO
TCM CIRCUIT FOR HIGH RESISTANCE
Di
sconnect the D-4 switch electrical connector, CC07.
1
Di

sconnect the TCM electrical connector, EM07.
2
Meas

ure the resistance between CC07,
pin 01 (US) and EM07, pin 13 (US).
3
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 INSTALL a new transmission range sensor. CLEAR th e DTC. TEST the system for normal operation.
P
INPOINT TEST AD : DTC P1606;
EMS CONTROL RELAY MALFUNCTION

E
lectronic Engine Controls - Engine
Control Module (ECM) Adaptation
Gen
eral Procedures
When to car

ry out adaptations
DTCs P1000/P1111 Conditions for adaptation
Fuelling Adaptations Drive Cycle
•
NOTE: Make sure the engine is at normal operating
temperature. (75°C, 167°F) 1.
Whenever the battery is disconnected, the Engine Control
Module (ECM) adaptations are reset to a "green" ECM
condition. In this condition, certain functions of the ECM are
inhibited, and the ECM must "r elearn" these functions. To
enable the ECM to do this, the vehicle will have to perform
some maneuvres which it may, or may not, do during a normal
road test. The routine in this pr ocedure should be carried out at
Pre-Delivery Inspection, and after any emissions related
rectification work involving the disconnection of the battery.
2. When the DTCs relating to a rectified concern are cleared,
P1000 (system checks not complete since last memory clear)
will be flagged. This DTC does no t indicate a failure, just that
diagnostic drive cycles need to be performed. The vehicle's on-
board diagnostic system will confirm that all the diagnostic
drive cycles are complete by flagging P1111, (system checks
complete since last memory clear)
1. Make sure these conditions are checked and corrected, if
necessary, before carrying ou t the adaptation procedure.
MechanicalElectrical
Engi
ne oil level correct
Coo

lant level correct
F

uel level greater than
30%, less than 80%
F
uel filler cap correctly
fitted/secure, seal in good condition
Al
l rectification work
relating to DTCs completed
F
uel, ignition and cooling
systems in good order
Al
l Diagnostic Trouble
Codes (DTCs) cleared
Al
l rectification work
relating to DTCs completed
F
uses
Harnes

ses
E

lectrical connectors

1.
Either
the Jaguar approved diagnostic system (where
available), or a scan tool should be connected to measure the
Mass Air Flow rate. Most generi c scan tools should be capable
of reading this parameter.
Depending on road conditions and dealer location, it may be
difficult to achieve the road sp eeds necessary to reach the air
flow indicated. It is possible to reach these air flow figures by
inducing a load on the vehicle, (making use of hills, using a
lower gear ratio, etc) or, if no alternative is possible, by
restraining the vehicle and re aching the air flow figure
Si
te
Mass Air Flow
(gra
ms/second)
D
riving Conditions
1Up t

o 7 g/s
Idle
in
P for 2 minutes
21
0 to 14 g/s
O
pen throttle in
P for 2 minutes
31
8 to 22 g/s
O
pen throttle in
P or D with
guidance * for 2 minutes
42
5 to 30 g/s
D
rive with guidance * for 2
minutes

Diagnostic Monitor Comp
letion
stat
ionery in
D.
WARNING: This should not be attempted without the vehicle
being in a safe area and suitably chocked. Failure to follow this
instruction may result in personal injury.
Without using the Jaguar approved diagnostic system or a scan
tool with system readiness capability, it will not be possible to
confirm when the adaptations are complete, unless P1111,
(system checks complete since last memory clear) is flagged. If
such equipment is not available, ALL the diagnostic monitors
will have to run to enable DTC P1111 to be flagged. In some US
states, this code is a requirem ent for annual emissions tests.
1. The dri v
e cycles detailed here w
ill enable the monitors to run,
but only after fuelling adaptations are complete.
Entry C
onditions
Di
agno
stic
Engine

S p
eed
Ve
h
icle
Speed
Mass Air Flow
(gra ms/sec
ond)
Ti
m
e to
Completion
Catalyst Monitor1 100
to

1600 rpm
50 to
72

kph (31 to 45
mph)
5 to
30 g/s
23
se
conds
HO2S6
00 t
o
2500 rpm
29 to

113 kph
(18 to 70
mph)
4 to
16 g/s
F
u
el cut for
more than 10 seconds, but less than 30 seconds *
Catalyst Monitor SensorN/ AN/A10
to 90 g/s
14
0
seconds
F
u
el System
N/
AN/AMore than 6 g/s33 se
conds
AACVN/
A61 to

121 kph
(38 to 75
mph)
4 to
16 g/s
F
u
el cut for 2
seconds *
P /
N switch
1
800
to

2200 rpm
80 to

101 kph
(50 to 63
mph)
N/ A31 se
conds
Evaporative

em is
sions
N/
A48 to
89

kph (30 to 55
mph)
and idle
R e
fer to drive
cycles for leak
tests in this section
Re
fer to drive
cycles for leak
tests in this section
2. During the drive cycle, drive gent ly, avoiding hard acceleration,
braking or cornering and rough roads.
1. Drive at 84 to 97 kph (52 to 60 mph) for 40 seconds.
2. Accelerate to 113 kph (70 mph).
3. Close the throttle, (ideally at the start of a descent)
continue with closed throttle for 10 seconds. (* Fuel
cut)
4. Drive at 56 to 64 kph (35 to 40 mph), holding the throttle as steady as possib le, on a flat level road for
30 seconds minimum.

Drive Cycle for 40 thou leak test
Drive Cycle for 20 thou leak test (2001 my on only)
1. Make sure the "conditions
for ad
aptation" detailed at the start
of this section are met.
1. Avoiding high engine load s, drive the vehicle steadily
between 48 and 89 kph (30 and 55 mph) for 15 to 20
minutes after starting the engine. (Depending on the
amount of fuel vapor gene rated, the test may take
longer than this).
2. Where possible, avoid body roll to minimise fuel movement.
3. If the scan tool being used is able to read TIDs, check
TID 08 in mode 6. If the test has not completed, this
TID will display "0". Any other value indicates that
the test has successfully completed.
4. If the test has not completed, the drive cycle must be repeated.
5. If the scan tool being used is not able to read TIDs, the only way to confirm that the test has run is to
check for P1111 after running the 20 thou test, where
applicable.
1. This test needs to be completed within 50 minutes of starting
the engine from cold. It should be run following the 40 thou
test.
1. Continue driving the vehi cle steadily between 48 and
89 kph, (30 and 55 mph) avoiding high engine loads
for a further 15 minutes.
2. Avoiding excessive fuel movement, bring the vehicle to rest.
3. Allow to idle for two minutes.
4. Provided the vapor conditions are suitable, the test will complete.
5. If the scan tool being used is able to read TIDs, check
TID 06 in mode 6. If the test has not completed, this
TID will display "0". Any other value indicates that
the test has successfully completed.
6. If the test has not completed, the drive cycle must be repeated.
7. Check for DTCs. P1111 will be flagged if all monitors have run.
8. Leak check drive cycles will only normally be necessary if an Evaporative Emissions related DTC is
flagged.
9. Unless P1111 is required for the State inspection, fuelling adaptations will normally be all that is
required for the vehicle to adapt itself and complete