1998 JAGUAR X308 ignition switch

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

Disc
onnect the battery negative terminal.
1
D
i
sconnect the ECM electrical connectors, EM10 and EM11.
2
Meas
ure t
he resistance between EM10,
pin 20 (BG) and PI42, pin 02 (BG).
3
Measure t
he resistance between EM11,
pin 12 (BG) and PI42, pin 02 (BG).
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 Check the ECM GROUND circuits. If the GROUND circuits are sound, contact dealer technical
support for advice on possible ECM failure.
PINPOINT TES
T T : DTC P1224, P1229; THROTTLE
CONTROL POSITION SENSOR ERROR/THROTTLE
MOTOR CONTROL CIRCUIT MALFUNCTION
•
NOTE: Before commencing this test, check the TP sensor
connections, perform the throttle adaptions procedure.
TES
T
CONDITIONS
D E
TAILS/RESULTS/ACTIONS
T
1: CH
ECK THE TP SENSOR TO ECM SE
NSE CIRCUIT 1 FOR HIGH RESISTANCE
Disc
onnect the battery negative terminal.
1
Disc
onne
ct the TP sensor electrical connector, PI06.
2
D
i
sconnect the ECM electrical connector, EM11.
3
Me
asure
the resistance between PI06, pin 02 (G) and EM11, pin 10 (G).
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 T2
.
T2
: CHECK THE THROTTLE MOTOR RELAY CONSTANT SUPPLY
R
e
connect the battery negative terminal.
1
R
e
move the thrott
le motor relay.
2
Measure t
he voltage between the throttle
motor relay base, pin 3 and GROUND.
3
Is the volt
age greater than 10 volts?
Yes GO to T3
.
No
R
EPAIR the circuit. This ci
rcuit includes the EMS fuse box, fuse 09. For addi tional information, refer to
the wiring diagrams. CLEAR the DTC. TE ST the system for normal operation.
T3
: CHECK THE THROTTLE MOTOR
RELAY EMS SWITCHED SUPPLY
Turn the ignition swit
ch to the
ON position.
1
Meas ure t
he voltage between the throttle
motor relay base, pin 1 and GROUND.
2
Is the volt
age greater than 10 volts?
Yes GO to T4
.
No
REP
AIR the circuit between the throttle motor relay
base, pin 1 and the battery. This circuit includes
the EMS fuse box, fuse 20, and the EMS control relay. For addition al information, refer to the wiring
diagrams. CLEAR the DTC. TEST th e system for normal operation.
T4
: CHECK THE THROTTLE MOTOR RELAY TO
ECM CIRCUIT FOR HIGH RESISTANCE
Turn the ignition swit
ch to the
OFF position.
1
Disc
onnect the battery negative terminal.
2
Di

sconnect the ECM electrical connector, EM13.
3
Measure t

he resistance between EM13, pin 14 (G
R) and throttle motor relay base, pin 2.
4
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 GO to T5
.
T5
: CHECK THE THROTTLE MOTOR RELAY OUTPUT TO ECM
Re
conn
ect the ECM electrical connector, EM13.
1

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

2.2. Check on non-volatile diagnostic memory by wr iting a test pattern and then reading it back.
3. 3. Internal 'watchdog' hardware to check whether the TCM has crashed.
Transmission Control Module Supply Voltage
The TCM monitors battery and igni tion switched supply voltages.
A permanent supply is used to maintain a battery backed 'memor y'. Should this supply be cut, due to battery disconnection
perhaps, the 'adaptive shift' valu es will be lost. This will result in a small reduction in shift quality for a period until th e
adaptions are 're-learned'
The TCM will adopt 'limp home' mode as a result of the supply voltage being >16V or <7V with an engine speed >1600
rpm.
Should the ignition supply be >7V but <9V the TCM will hold the gear that it has currently selected. If after 2.5 seconds,
with the engine speed >1600 rpm, the voltage remains at this level, 'limp home' mode will be adopted. The 2.5 second
delay is built in to prevent reaction to a momentary voltage fluctuation.
Operation
CAUTION: Disconnection of the TCM and / or the vehicle batt ery will cause system adaptions to be lost; this may be
apparent by shift quality degradation. Fo llowing reconnection, a period of 'varied' driving will reinstate adaptions and thus
normal operation. Please ensure that the customer is made aware that the adaption period is variable and may occur after
handover, as the transmission re-learns the prevailing driving style.
• NOTE: Should the TCM fail, please ensure that the control housing cooling fan is operating correctly. Failure of the cooling
fan MUST be rectified before renewing the TCM and details of a fan fa ilure should accompany the returned TCM.
The TCM processes information received in both analogue and digital form, such as:
Transmission input speed Transmission output speed Throttle position Pedal demand Gear selector position Engine torque Engine speed Transmission oil temperature Mode switch
This information is then used by the TC M to control shift energy management and decide which shift program to implement
and which gear to select.
The TCM uses the various sensors and inpu ts to monitor the correct operation of the system an d is programmed to take
default action and inform the operator when a fault occurs.
Safety Functions
The safety functions are designed to safeguard against inappr opriate actions by the operator as well as against system
malfunctions. The system prevents reve rse gear from being engaged at high forward speeds and prevents manual
downshifting at excessive engine speeds; these functions are not operational in mechanical limp-home mode.
The TCM constantly monitors the transmissi on for faults. In the event of a problem the TCM will adopt a 'limp home' mode
in which only P R N D - (selector in D but only fourth gear is enabled) are available. The operator will be made aware of
certain faults by an in strument panel warning.
The electrical and diagnostic system has been designed such that system integrity is protected at all times, the safety
concept being based on th e following three points:

Connector Pin Identity Chart for CC014

Connector Pin Identity Chart for EM047
030Shift solenoid valve #1
031Not used
032Shift solenoid valve #3
033Shift solenoid valve #2
034Power ground
035Not used
036Rotary switch L1
037Rotary switch L3
038 to 041Not used
042Input speed sensor (+)
043Not used
044Output speed sensor (-)
045Mode switch Pin A (Normal)
046 to 050Not used
051Pressure regulator #5
053Solenoid valve (+)
052Pressure regulator (+)
054Fused ignition (+)
055Fused ignition (+)
056 to 081Not used
082CAN link In (-)
083CAN link In (+)
084Not used
085CAN link Out (-)
086CAN link Out (+)
087JDS L-line (not used)
088JDS K-line (not used)
Pin NumberCircuit Function
112V ignition
2Security LED (power)
3CAN link In (-)
4CAN link In (+)
5Gate illumination (power)
6Security LED (ground)
7Not used
8CAN link Out (-)
9CAN link Out (+)
10Gate illumination (ground)
11Not used
12Not used

Symptom Chart
Symptom Chart
P0758
Solenoid #3 circuit fault
*GO to
P0763
*
TCM faulty
*GO to
P1605 and
P1608
*
ABS fault
CAN circuit fault between ABS/TCCM and TCM
Output speed sensor circuit fault
*
*
*GO to
P1720
*
Mechanical fault (check all other operations)
*GO to
P1726
*
Pressure regulator, solenoid
or speed sensor circuit fault
Mechanical fault - transmission defaulted to 5th?
*
*GO to
P1734
*
Pressure regulator #1 circuit fault
*GO to
P1745
*
Pressure regulator #2 circuit fault
*GO to
P1746
*
Pressure regulator #3 circuit fault
*GO to
P1747
*
Pressure regulator #4 circuit fault
*GO to
P0743
*
Pressure regulator #5 circuit fault
*GO to
P1748
*
Mechanical fault - transmission defaul
ted during 2nd to 3rd or 3rd to 4th
shift?
*GO to
P1779
*
Power (ignition) supply fault to TCM
Vehicle battery charging system fault
*
*GO to
P1789 and
P1793
*
Incompatible ECM, ABS/TCCM, TCM or INST - check part number
*GO to
P1795
*
CAN circuit fault
Check fault code(s) in ECM, ABS/TCCM or INST and rectify as required
*
*GO to
P1796
*
Faulty ECM
CAN circuit fault between ECM and TCM
*
*GO to
P1797
*
Default to 5th gearOutput speed sensor circuit fault
Mechanical fault (check pulling
away from standstill performance)
*
*GO to
P1722
*
Output / input speed sensor circuit fault
Mechanical fault (check operation of tr
ansmission in 2nd, 3rd and 4th gears)
*
*GO to
P1730
*
SymptomPossible SourcesAction
DTC P0741 Torque converter clutch system
performance or stuck offTorque converter clutch slipping or stuck off
*GO to Pinpoint
Test A
*
DTC P0742 Torque converter clutch system stuck onTorque converter clutch stuck on
*GO to Pinpoint
Test A
*
DTC P0743 Torque converter clutch system
electrical#4 pressure regulator faulty
Harness fault
Connector pins(s) bent
, loose or corroded
*
*
*GO to Pinpoint
Test B
*
DTC P0702 Transmission control system
electricalHarness fault
High side switch (FET) fault
Connector pins(s) bent
, loose or corroded
*
*
*GO to Pinpoint
Test C or D
*
DTC P0753 Shift solenoid A electricalHarness fault
Solenoid open circuit
Solenoid short
Connector pins(s) bent
, loose or corroded
*
*
*
*GO to Pinpoint
Test C
*
DTC P0758 Shift solenoid B electricalHarness fault
Solenoid open circuit
Solenoid short
Connector pins(s) bent
, loose or corroded
*
*
*
*GO to Pinpoint
Test C
*
DTC P0763 Shift solenoid C electricalHarness fault
Solenoid open circuit
Solenoid short
Connector pins(s) bent
, loose or corroded
*
*
*
*GO to Pinpoint
Test C
*

Is underhood fuse F1 OK?
Yes GO to K3
No Renew the fuse (10A) and te st the system for normal
operation
K3: CHECK SWITCHED POWER SUPPLY
With EM007 disconnected measure the voltage between
EM007/054 and ground EM008R 1
Repeat for EM007/055 and ground EM008R 2
B+?
Yes Cycle the ignition ON - (OFF for 2 minutes) -
ON, start the engine and run >1600 rpm, if the fault re-logs contact
Jaguar Service
No No re-log?
GO to K5
No GO to K4
K4: CHECK HARNESS CONTINUITY - SWITCHED POWER SUPPLY

it overflows from the plug orifice. 2. CAUTION: It is essential that only the specified
fluid is used.
Wait until the flow of fluid has reduced to a trickle.

3. Fit, but do not tighten the plug.
4. Prepare PDU (at the base station).
1. Install the appropriat e disk and switch ON.
2. Select the vehicle specification - ENTER.
3. From Engineering Tools select Toolbox - ENTER.
4. From Toolbox select Powertrain - ENTER.
5. Connect MPA and download cable to PDU and base station.
6. Select Datalogger - ENTER.
7. Select Transmission - ENTER.
8. Disconnect download cable.
9. Connect MPA to PDU.
5. Connect PDU (at the vehicle).
1. Connect MPA cable to the vehicle diagnostic socket -
ENTER.
2. Energize the vehicle ignition - ENTER.
3. From the menu select Transmission oil temperature (TOT) - ENTER.
4. Check that the fluid temperature is <30°C.
6. From above.
7. NOTE: Ensure that the TCM is connected and functioning
correctly.
Select Park and start the engine.