Jaguar XJ (X350). Manual — part 239

temperature limit. The traction control brake intervention will remain disabled until the brakes have

cooled, irrespective of ignition switch position or ignition switch cycling.

Stability Assist

Dynamic stability control (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.

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 also provides

failure messages via the instrument cluster message center.

Emergency Brake Assist

The emergency brake assist function allows the driver to enter ABS with greater speed and efficiency

so that maximum braking is achieved sooner. Using the information received from the wheel speed

sensors, brake pedal travel switch, master cylinder pressure transducer, master cylinder active

booster solenoid and the yaw rate sensor and accelerometer, the ABS module detects whether more

braking pressure can be applied in relation to how much braking pressure the driver is applying in an

emergency braking situation.

Inspection and Verification

1 . Verify the customer concern.

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

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

Mechanical

Electrical

•

Brake fluid level

•

Vacuum system

•

Warning light operation

•

Fuses (see table)

•

Wheel speed sensor fitment

•

Wheel speed sensor air gap

•

Wheel speed sensor tone ring(s) (missing or damaged
teeth/contamination)

•

Yaw rate/lateral accelerometer sensor cluster fitment

•

Incorrect wheel or tire size

•

Wheel speed sensors

•

Connectors/Pins

•

Harnesses

•

Steering wheel angle sensor

•

Yaw/lateral rate sensor
cluster

•

ABS/DSC module

4 . If an obvious cause for an observed or reported concern is found, correct the cause (if possible)

before proceeding to the next step.

5 . 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.

Fuse Identification Table

Location

Fuse Number Rating

Circuit

Engine bay fuse box

20

30 Amp ABS/Stability assist control pump battery supply

Engine bay fuse box

22

30 Amp ABS/Stability assist control module battery supply

Cabin fuse box

17

5 Amp

ABS/Stability assist control module ignition supply

Primary junction box 44

5 Amp

Brake light switch battery supply

Brake Pedal Position Switch Calibration

The brake pedal position switch procedure is under review. For further information, contact dealer

technical support.

Diagnostic Trouble Code (DTC) Index

DTC

Description

Possible Source

Action

C1093

Traction control disable

CAN failure

•

Traction control disable CAN
message failure

For CAN module circuit tests,

<<418-00>>

C1095

Pump motor circuit

failure

•

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

•

Pump motor failure

For ABS/DSC module circuit

tests, GO to Pinpoint Test

G307559p1

.

www.

C1141

Left-hand front wheel

speed sensor tone ring

damaged/missing

tooth

•

Damaged/ missing tooth on
tone ring

Refer to visual inspection

chart. Inspect tone ring for

damage.

C1142

Right-hand front wheel

speed sensor tone ring

damaged/missing

tooth

•

Damaged/ missing tooth on
tone ring

Refer to visual inspection

chart. Inspect tone ring for

damage.

C1143

Left-hand rear wheel

speed sensor tone ring

damaged/missing

tooth

•

Damaged/ missing tooth on
tone ring

Refer to visual inspection

chart. Inspect tone ring for

damage.

C1144

Right-hand rear wheel

speed sensor tone ring

damaged/missing

tooth

•

Damaged/ missing tooth on
tone ring

Refer to visual inspection

chart. Inspect tone ring for

damage.

C1145

Right-hand front wheel

speed sensor (WSS)

circuit failure

•

Wheel speed sensor circuit;
open circuit, short circuit

•

Wheel speed sensor to
control module circuit; high
resistance, open circuit,
short circuit to GROUND

•

Wheel speed sensor failure

For right hand front WSS

circuit tests, GO to Pinpoint

Test

G307559p2

.

C1155

Left-hand front wheel

speed sensor (WSS)

circuit failure

•

Wheel speed sensor circuit;
open circuit, short circuit

•

Wheel speed sensor to
control module circuit; high
resistance, open circuit,
short circuit to GROUND

•

Wheel speed sensor failure

For left hand front WSS circuit

tests, GO to Pinpoint Test

G307559p3

.

C1165

Right-hand rear wheel

speed sensor (WSS)

circuit failure

•

Wheel speed sensor circuit;
open circuit, short circuit

•

Wheel speed sensor to
control module circuit; high
resistance, open circuit,
short circuit to GROUND

•

Wheel speed sensor failure

For right hand rear WSS circuit

tests, GO to Pinpoint Test

G307559p4

.

C1175 Left-hand rear wheel

speed sensor (WSS)

•

Wheel speed sensor circuit;
open circuit, short circuit

•

Wheel speed sensor to

For left -hand rear WSS circuit

tests, GO to Pinpoint Test

circuit failure

control module circuit; high
resistance, open circuit,
short circuit to GROUND

•

Wheel speed sensor failure

G307559p5

.

C1233

Left-hand front wheel

speed sensor (WSS)

signal failure

•

Wheel speed sensor gap too
large

•

Missing tone ring or sensor

•

Incorrect tone ring

•

Incorrect wheel size

Check the wheel speed sensor

for correct fitment.

Front Wheel Speed Sensor

(70.60.03)

C1234

Right-hand front wheel

speed sensor (WSS)

signal failure

•

Wheel speed sensor gap too
large

•

Missing tone ring or sensor

•

Incorrect tone ring

•

Incorrect wheel size

Check the wheel speed sensor

for correct fitment.

Front Wheel Speed Sensor

(70.60.03)

C1235

Right-hand rear wheel

speed sensor (WSS)

signal failure

•

Wheel speed sensor gap too
large

•

Missing tone ring or sensor

•

Incorrect tone ring

•

Incorrect wheel size

Check the wheel speed sensor

for correct fitment.

Rear Wheel Speed Sensor

(70.60.04)

C1236

Left-hand rear wheel

speed sensor (WSS)

signal failure

•

Wheel speed sensor gap too
large

•

Missing tone ring or sensor

•

Incorrect tone ring

•

Incorrect wheel size

Check the wheel speed sensor

for correct fitment.

Rear Wheel Speed Sensor

(70.60.04)

C1267

ABS/DSC function

temporarily disabled

•

HF interference

•

Supply voltages to valve
solenoids or sensors out of
range

•

EEPROM read/write failure

•

ABS/DSC module failure

Contact dealer technical

support for advice on possible

ABS/DSC module failure. Refer

to inspection and verification

for information on warning

light behavior

C1277

Steering angle sensor

(SA sensor) circuit A/B

failure

•

SA sensor circuit(s) open
circuit, short circuit, short
circuit to GROUND or B+

•

SA sensor damaged

•

Sensor wiring damaged

•

Sensor loose, not mounted
correctly

For SA sensor circuit tests, GO

to Pinpoint Test

G307559p6

.

C1279

Yaw rate sensor circuit

failure

•

Yaw rate/lateral
accelerometer sensor
cluster circuit(s) open/short
circuit, short circuit to

For lateral/yaw rate sensor

circuit tests, GO to Pinpoint

Test

G307559p7

.

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