Jaguar X-Type Sedan and Estate (Wagon). Service manual — part 95

enables the system to recognize the driver's intentions.

The DSC system also incorporates emergency brake assist (EBA), which measures the rate at which the brake pressure increases during a
braking manoeuvre. If the system detects an emergency braking situation, EBA automatically initiates the full braking effect. This can
reduce the stopping distances in critical situations, therefore allowing an inexperienced driver to stop in the same distance as an
experienced driver.

On vehicles with 2.0L or diesel engines the traction control system (TCS) is incorporated into the anti-lock brake system (ABS). On vehicles
with 2.5L and 3.0L engines the traction control is an additional function added to the DSC system. The vehicles driven wheels are
continually monitored for wheel spin relative to the calculated reference speed and to each other. If wheel spin is detected, the traction
control function intervenes independently of the driver, applying brake pressure to the slipping wheel and reducing the engine drive torque
supply. Meanwhile, brake pressure is modulated by the traction control until traction is re-established. Traction control brake actuation is
diminished above 40 kph (25 mph). Above this speed traction control relies primarily on engine torque reduction.

Dynamic stability control is enabled/disabled via the DSC 'ON/OFF' switch. When the switch is in the 'OFF' position, the amber DSC warning
lamp solidly illuminates within the instrument cluster message center. The DSC is automatically activated when the ignition is switched on.
The DSC provides self-diagnostics also via the instrument cluster message center.

The traction control brake intervention is automatically disabled whenever the brakes exceed a temperature limit. The traction brake
intervention will remain disabled until the brakes have cooled, irrespective of ignition switch position or ignition switch cycling.

Published: 11-May-2011

Anti-Lock Control - Stability Assist - Anti-Lock Control - Stability AssistVIN Range:
C00344->J12991

Diagnosis and Testing

Principle of operation

The anti-lock brake system (ABS) modulates brake pressure on each wheel independently to maintain vehicle stability during braking. The
ABS continually monitors the rotational velocity of each wheel anytime the ignition switch is in the ON position and determines if a tire is
skidding when the brakes are applied. Only then does the ABS intervene to modulate the brake pressure to the skidding wheel. The
modulation continues until the wheel rotates freely. The brake pressure is then restored and the modulate/restore cycle is repeated
whenever skidding is detected. This cycle occurs at a rate of several times per second.

The ABS module is capable of detecting the following system conditions:

hydraulic valve failure
wheel speed sensor failure
ABS power relay short circuit
interconnect failures to the ABS sensors, power and ground to the ABS module
over/under voltage conditions

The ABS provides failure messages, via the ABS indicator, in the instrument cluster. Failure of the ABS module, for whatever reason, will not
compromise the normal operation of the brake system.

Dynamic Stability Control (DSC) equipped vehicles

DSC maximizes vehicle stability under all conditions. The DSC system compares actual vehicle course to that intended by the driver. If the
intended course differs from the actual course due to over steer or under steer conditions, the DSC system will brake individual wheels and
reduce engine torque to bring the vehicle back to the driver's intended direction. By using a combined yaw rate sensor and lateral
accelerometer, the vehicles rotational motion around its vertical axis and centrifugal forces generated while cornering are calculated to
determine the vehicle's actual behavior. Using additional sensors for detecting steering wheel position and road wheel speed enables the
system to recognize the driver's intentions.

DSC/TCS is enabled/disabled via the DSC/TCS ON/OFF switch. When the switch is in the OFF position, the amber DSC/TCS warning lamp
solidly illuminates within the instrument cluster message center. The DSC/TCS is automatically activated when the ignition is switched on.
The DSC/TCS also provides failure messages via the instrument cluster message center.

On 2.0L vehicles the traction control system (TCS) is incorporated into the anti-lock brake system (ABS). Where DSC is fitted, traction
control is a function within the DSC system. The vehicle's driven wheels are continually monitored for wheel spin relative to the calculated
reference speed and to each other. If wheel spin is detected, the traction control function intervenes independently of the driver, applying
brake pressure to the slipping wheel and reducing the engine drive torque supply. Meanwhile, brake pressure is modulated by the traction
control until traction is re-established. Traction control brake actuation is diminished above 40 km/h (25 mph). Above this speed traction
control relies primarily on engine torque reduction.

The traction control brake intervention is automatically disabled whenever the brakes exceed a temperature limit. The traction brake
intervention will remain disabled until the brakes have cooled, irrespective of ignition switch position or ignition switch cycling.

Inspection and Verification

1. Verify the customer concern.

1.

2. Confirm if the ABS warning light was illuminated, or still is.

2.

• NOTE: An intermittent fault may allow the warning light to go off. This does not necessarily mean the fault is not present. Some warnings
will appear to clear when the ignition is cycled. This is often because the warning has flagged as a result of one of the vehicle's on-board
diagnostic routines having run to detect the fault. If the same routine is not run when the ignition is switched ON, the warning will not
reflag until the routine does run.

3. In order to confirm the customer concern, it may be necessary to follow a drive cycle which will enable the system to perform it's

diagnostic routine (see below).

3.

Diagnostic Drive Cycles

• NOTE: See the DTC index for details of codes and possible sources/actions.

DTC

Cycle to detect fault

Cycle to clear fault

System response to fault

detection

C1095

Turn the ignition switch to the OFF position. Restart
and drive the vehicle to activate ABS

Drive vehicle at more than 40
km/h (25 mph) for more than 2
minutes

ABS shut-down, ABS light ON,
DSC/TCS shut-down, DSC/TCS
light ON

C1137

Turn the ignition switch to the OFF position, then ON
for more than 8 minutes

Turn the ignition switch to the
ON position

ABS shut-down, ABS light ON,
DSC/TCS shut-down, DSC/TCS
light ON

C1145/C1155
/C1165/C1175

Turn the ignition switch to the OFF position. Restart
and drive the vehicle at more than 20 km/h (12.5 mph)
for more than 2 minutes

Drive vehicle at more than 20
km/h (12.5 mph)

ABS shut-down, ABS light ON,
DSC/TCS shut-down, DSC/TCS
light ON

C1233/C1234
/C1235/C1236

Turn the ignition switch to the OFF position. Restart
and drive the vehicle at more than 40 km/h (25 mph)
for more than 2 minutes

Drive vehicle at more than 20
km/h (12.5 mph)

ABS shut-down, ABS light ON,
DSC/TCS shut-down, DSC/TCS
light ON

C1267

Turn the ignition switch to the OFF position. Restart
and drive the vehicle at more than 40 km/h (25 mph)

Turn the ignition switch to the
ON position

ABS shut-down, ABS light ON,
DSC/TCS shut-down, DSC/TCS
light ON

B1342

Turn the ignition switch to the OFF position. Restart
and drive the vehicle at more than 20 km/h (12.5 mph)

Turn the ignition switch to the
ON position

ABS shut-down, ABS light ON,
DSC/TCS shut-down, DSC/TCS
light ON

B1676

Turn the ignition switch to the OFF position, then turn
the ignition switch to the ON position

Turn the ignition switch to the
ON position

System functions between 9 and
19 volts

Visual Inspection

1. Visually inspect for obvious signs of mechanical or electrical damage.

1.

Mechanical

Electrical

Check the tire sizes, condition, and inflation
Brake fluid level or leakage
W heel speed sensor fitment
W heel speed sensor air gap
W heel speed sensor toothed wheels (missing teeth/contamination)

W arning light operation
Fuses (see table)
ABS/Traction control control unit
W heel speed sensors
W heel speed sensor link leads
Connectors/pins
Harnesses
Grounds

Fuse Identification Table

Location

Fuse Number

Rating

Circuit

Battery junction box

05

30 Amp

Vacuum module battery supply (2 ltr only)

Central junction box

67

5 Amp

Vacuum module ignition supply (2 ltr only)

Battery junction box

03

60 Amp

ABS/DSC/TCS module battery supply

Central junction box

96

7.5 Amp

ABS/DSC/TCS module ignition supply

Central junction box

90

7.5 Amp

Brake light switch circuit

1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next

step.

1.

2. If the cause is not visually evident and the Jaguar approved diagnostic system is not available, use a fault code reader to retrieve

the fault codes before proceeding to the Diagnostic Trouble Code (DTC) Index Chart.

2.

DTC Index

DTC

Description

Possible Source

Action

C1095 Pump motor circuit

fault

Pump motor circuit; open circuit,
short circuit, high resistance
Pump motor failure
Pump motor power supply circuit;
open circuit, short circuit to
GROUND
Pump motor GROUND circuit; open
circuit

The pump motor is internal to the control module. For pump circuit
tests, GO to Pinpoint Test

I.

Please check part is not on any form

of prior authorisation before replacement.

C1137 Control module circuit

failure

Control module failure

Please check part is not on any form of prior authorisation before
replacement.

C1145 Right-hand front wheel

speed sensor (WSS)
circuit failure

Wheel speed sensor circuit(s);
open circuit, short circuit

For right-hand front WSS circuit tests, GO to Pinpoint Test

A.

C1155 Left-hand front wheel

speed sensor (WSS)
circuit failure

Wheel speed sensor circuit(s);
open circuit, short circuit

For left-hand front WSS circuit tests, GO to Pinpoint Test

B.

C1165 Right-hand rear wheel

speed sensor (WSS)
circuit failure

Wheel speed sensor circuit(s);
open circuit, short circuit

For right-hand rear WSS circuit tests, GO to Pinpoint Test

C.

C1175 Left-hand rear wheel

speed sensor (WSS)
circuit failure

Wheel speed sensor circuit(s);
open circuit, short circuit

For left-hand rear W SS circuit tests, GO to Pinpoint Test

D.

C1222 Wheel speed signal

conflict

Vehicle operating with punctured
tire(s)
Mismatched wheel/tire sizes
Wheel speed sensor reluctor tooth
damage - one or more wheels

Check wheel/tire sizes and conditions, check for sensor/reluctor
damage. Check for associated DTCs. Clear the DTC, check the
system for normal operation.

C1233 Left-hand front wheel

speed sensor (WSS)
signal fault

Wheel speed sensor failure
Harness damage/kinks
Incorrect air gap
Contamination of the sensor wheel

Check the air gap at the left-hand front W SS, check the harness for
damage/kinks. For left-hand front W SS circuit tests, GO to Pinpoint
Test

B.

C1234 Right-hand front wheel

speed sensor (WSS)
signal failure

Wheel speed sensor failure
Harness damage/kinks
Incorrect air gap
Contamination of the sensor wheel

Check the air gap at the right-hand front W SS, check the harness
for damage/kinks. For right-hand front W SS circuit tests, GO to
Pinpoint Test

A.

C1235 Right-hand rear wheel

speed sensor (WSS)
signal failure

Wheel speed sensor failure
Harness damage/kinks
Incorrect air gap
Wheel speed sensor reluctor
damage (AW D)
Contamination of the sensor wheel

Check the air gap at the right-hand rear WSS, check for reluctor
damage (AWD). Check the harness for damage/kinks. For
right-hand rear W SS circuit tests, GO to Pinpoint Test

C.

C1236 Left-hand rear wheel

speed sensor (WSS)
signal failure

Wheel speed sensor failure
Harness damage/kinks
Incorrect air gap
Wheel speed sensor reluctor
damage (AW D)
Contamination of the sensor wheel

Check the air gap at the left-hand rear WSS, check for reluctor
damage (AWD). Check the harness for damage/kinks. For left-hand
rear WSS circuit tests, GO to Pinpoint Test

D.

C1266 Modulator solenoids

power supply circuit
fault

Power supply failure to valve relay
ABS modulator failure
DSC modulator failure

Check the fuses and power circuit. For additional information, refer
to the wiring diagrams. Please check part is not on any form of
prior authorisation before replacement.

C1267 Modulator valve fault

Modulator valve failure

Please check part is not on any form of prior authorisation before
replacement.

1
2
3
4

1

1

DTC

Description

Possible Source

Action

C1278 Steering angle sensor

CAN message not
plausible

Steering angle sensor not
calibrated
Steering angle sensor power
supply circuit; open circuit, high
resistance
Steering angle sensor failure

For steering angle sensor power supply circuit tests, GO to Pinpoint
Test

E.

C1279 Yaw rate sensor circuit

fault

Yaw rate sensor circuit; open
circuit, short circuit, high
resistance
Yaw rate sensor CAN circuit; open
circuit
Yaw rate sensor failure

For yaw rate sensor power supply circuit tests,GO to Pinpoint Test

F.

For yaw rate sensor CAN circuit tests,

REFER to:

Communications Network - VIN Range: E96603->J28492

(418-00 Module Communications Network, Diagnosis and Testing).

C1280 Yaw rate sensor CAN

message not plausible

Yaw rate sensor failure

Use the Jaguar approved diagnostic system to measure the yaw
rate offset. For CAN circuit tests,
REFER to:

Communications Network - VIN Range: E96603->J28492

(418-00 Module Communications Network, Diagnosis and Testing).

C1282 Lateral acceleration

CAN message not
plausible

Yaw rate sensor installation
Yaw rate sensor failure

Check the power supply to the sensor. For additional information,
refer to the wiring diagrams. Use the Jaguar approved diagnostic
system to measure the lateral accelerator signal. For CAN circuit
tests,
REFER to:

Communications Network - VIN Range: E96603->J28492

(418-00 Module Communications Network, Diagnosis and Testing).

C1288 Brake pressure sensor

circuit fault

Brake pressure sensor circuit; open
circuit, short circuit, high
resistance
Brake pressure sensor failure

For brake pressure sensor circuit tests, GO to Pinpoint Test

G.

C1440 Brake pressure signal

fault

Brake pressure sensor failure
Control module failure

Use the Jaguar approved diagnostic system to measure the brake
pressure signals.

C1956 Steering angle sensor

fault

Steering angle sensor CAN circuit;
open circuit
Steering angle sensor failure

For CAN circuit tests,
REFER to:

Communications Network - VIN Range: E96603->J28492

(418-00 Module Communications Network, Diagnosis and Testing).

C1975 DSC signal conflict

Steering angle sensor incorrectly
installed
Steering angle sensor not
calibrated - recalibrate using the
Jaguar approved diagnostic system
Steering angle sensor failure

Check the installation of the steering angle sensor. Recalibrate as
necessary. INSTALL a new sensor if necessary.

B1676 Battery voltage out of

range: 9 - 16 volts

Charging system high/low voltage
Control module failure

For charging system tests, REFER to: (414-00 Battery and Charging
System - General Information)

Charging System - 2.0L NA V6 - AJV6/2.5L NA V6 - AJV6/3.0L
NA V6 - AJ27

(Diagnosis and Testing),

Charging System - 2.0L Duratorq-TDCi/2.2L Duratorq-TDCi
(110kW /150PS) - Puma

(Diagnosis and Testing).

Please check part is not on any form of prior authorisation before
replacement.

None Brake light switch

circuit fault

Brake light switch power supply
circuit fault
Brake light switch to ABS/DSC
module circuit fault
Brake light switch fault

For brake light switch circuit tests, GO to Pinpoint Test

H.

Pinpoint Tests

PINPOINT TEST A : DTC C1145, C1234; RIGHT-HAND FRONT WHEEL SPEED SENSOR (WSS) CIRCUIT FAILURE

CAUTION: To protect against over-voltage and static discharge, the contacts of the wheel speed sensor must not be touched by hand.

• NOTE: W here the Jaguar approved diagnostic system is available, use datalogger to monitor the wheel speed sensor values when driving
in the straight-ahead position (all sensors should have the same value).

TEST

CONDITIONS

DETAILS/RESULTS/ACTIONS

A1: CHECK THE RIGHT-HAND FRONT WSS SENSOR CIRCUIT FOR HIGH RESISTANCE

Make sure the ignition switch is in the OFF position.
Disconnect the ABS/DSC module electrical connector, JB45/JB185.
Disconnect the wheel speed sensor electrical connector, RF01.
Measure the resistance between RF01, pin 02 (W) and JB45/JB185, pin 16 (W R).

Is the 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 A2

.

A2: CHECK THE RIGHT-HAND FRONT WSS SENSOR CIRCUIT FOR SHORT CIRCUIT TO BATTERY

Measure the voltage between RF01, pin 02 (W) and GROUND.

Is the voltage greater than 3 volts?
Yes

REPAIR the short circuit. For additional information, refer to the wiring diagrams. CLEAR the DTC, test the system
for normal operation.

No

GO to A3

.

A3: CHECK THE RIGHT-HAND FRONT WSS SENSOR CIRCUIT FOR SHORT CIRCUIT TO GROUND

Measure the resistance between RF01, pin 02 (W) and GROUND.