Jaguar XJ (X350). Manual — part 989

U040500

Invalid data received from

speed control module

ECM/Speed control

module invalid data
received

For network tests,

U041600

Invalid data received from

stability assist module

ECM/ABS module invalid

torque drag request

For network tests,

Pinpoint tests

CAUTION: When probing connectors to take measurements in the course of the pinpoint

tests, use the adaptor kit, part number 3548-1358-00. Failure to follow this instruction may result

in damage to the vehicle.

NOTE:

When performing voltage or resistance tests, always use a digital multimeter (DMM) accurate to

3 decimal places, and with an up-to-date calibration certificate. When testing resistance, always

take the resistance of the DMM leads into account.

NOTE:

Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.

NOTE:

If DTCs are recorded and a fault is not present when performing the pinpoint tests, an

intermittent concern may be the cause. Always check for loose connections and corroded

terminals.

PINPOINT TEST G549822p1 : ENGINE
COOLANT TEMPERATURE (ECT)
SENSOR

G549822t1 : CHECK THE ECT PID VALUE

1.

Circuit

Pin

Engine coolant temperature sensor - signal

01

Engine coolant temperature sensor - return 02

2.

Circuit

Pin

Engine coolant temperature sensor - signal

C2

Engine coolant temperature sensor - return E2

Resistance (ohms) Temperature (degrees C) Temperature (degrees F) Volts

925021

-40

-40

4.8942

496051

-30

-22

4.8062

276959

-20

-04

4.6633

160313

-10

14

4.4454

www.

123485

-5

23

4.3031

95851

0

32

4.1368

74914

5

41

3.9464

58987

10

50

3.7340

37340

20

68

3.2560

24253

30

86

2.7403

16113

40

104

2.2309

10926

50

122

1.7665

7548

60

140

1.3700

5335

70

158

1.0529

3837

80

176

0.8048

2804

90

194

0.6148

2080

100

212

0.4710

1564

110

230

0.3636

1191

120

248

0.2810

918

130

266

0.2194

3. Make sure that the engine is cold. 4. Key on, engine off. 5. Access the OBDII-engine coolant

temperature PID using the Jaguar approved diagnostic system or a scan tool.

Is the ECT reading as expected for the current environmental and engine conditions?

-> Yes

GO to Pinpoint Test G549822t2.

-> No

GO to Pinpoint Test G549822t7.

G549822t2 : CHECK THE ECT PID VALUE DURING WARM UP

1. Key on, engine running. 2. Access the OBDII-engine coolant temperature PID using the Jaguar

approved diagnostic system or a scan tool. 3. Increase the engine speed to 2,000 rpm and monitor

the ECT reading until the engine is at full operating temperature.

Did the ECT reading rise smoothly to a value of between 80 and 95 degrees C (176 and 203

degreees F)?

-> Yes

An intermittent fault may be present in the wiring harness. Visually check for chaffed wires or other

physical damage to the harness.

-> No

GO to Pinpoint Test G549822t3.

G549822t6 : CHECK FOR AN INTERMITTENT FAULT CONDITION

1.

Were there any sudden or unexpected changes in the PID readings?

-> Yes

Key off. GO to Pinpoint Test G549822t3.

-> No

GO to Pinpoint Test G549822t7.

G549822t3 : CHECK THE ECT PID VALUE

1. Key on, engine off. 2. Access the OBDII-engine coolant temperature PID using the Jaguar approved

diagnostic system or a scan tool. 3. Check the ECT harness wiring and connectors for loose

connections and water ingress. Monitoring the temperature readings for sudden changes while

handling the harness and connectors may help in isolation of these types of fault.

Did you identify any loose connections or water ingress in the ECT harness wiring or

connectors?

-> Yes

REPAIR the fault as necessary. For additional information, refer to the wiring diagrams. Clear any

DTCs, test the system for normal operation.

-> No

GO to Pinpoint Test G549822t7.

www.