Jaguar XJ (X350). Manual — part 1003

-> Yes

GO to Pinpoint Test G549822t68.

-> No

REPAIR the short circuit. For additional information, refer to the wiring diagrams. Clear any DTCs, test

the system for normal operation.

G549822t68 : CHECK THE KS CIRCUIT(S) FOR HIGH RESISTANCE

1. Measure the resistance between:

C88, harness side C100, harness side

Pin 01

Pin D3

Pin 02

Pin C4

Are the resistances less than 10 ohms?

-> Yes

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

physical damage to the harness. If no fault is found in the circuit, suspect the following

component(s): - KS connector - KS sensor - ECM connector - ECM

-> No

REPAIR the high resistance circuit. For additional information, refer to the wiring diagrams. Clear any

DTCs, test the system for normal operation.

PINPOINT TEST G549822p9 : INTAKE
AIR TEMPERATURE (IAT) SENSOR

G549822t69 : CHECK THE IAT PID VALUE

1.

Circuit

Pin

Intake air temperature sensor - signal

02

Intake air temperature sensor - return 03

2.

Circuit

Pin

Intake air temperature - return L4

Intake air temperature - signal

F1

Mass air flow sensor - return

L4

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

44373

-40

-40

4.7844

25572

-30

-22

4.6373

15141

-20

-04

4.4166

9202

-10

14

4.1073

5774

0

32

3.7137

3714

10

50

3.2499

2448

20

68

2.7518

1671

30

86

2.2759

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1150

40

104

1.8254

816.5

50

122

1.4497

583.1

60

140

1.1287

426.1

70

158

0.8792

315.8

80

176

0.6818

238.1

90

194

0.5319

182.8

100

212

0.4187

141.2

110

230

0.3297

110.3

120

248

0.2613

87.45

130

266

0.2095

3. Make sure that the engine is cold. 4. Key on, engine off. 5. Access the ECM-Intake air temperature

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

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

-> Yes

GO to Pinpoint Test G549822t70.

-> No

GO to Pinpoint Test G549822t73.

G549822t70 : CHECK THE IAT PID VALUE AT INCREASED RPM

1. Key on, engine running. 2. Access the ECM-Intake air temperature PID using the Jaguar approved

diagnostic system or a scan tool. 3. Slowly increase the engine speed to 4,000 rpm while monitoring

the IAT reading.

Did the IAT reading rise smoothly?

-> 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 G549822t71.

G549822t71 : CHECK FOR AN INTERMITTENT FAULT CONDITION

1.

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

-> Yes

Key off. GO to Pinpoint Test G549822t72.

-> No

GO to Pinpoint Test G549822t73.

G549822t72 : CHECK THE IAT PID VALUE

1. Key on, engine off. 2. Access the ECM-Intake air temperature PID using the Jaguar approved

diagnostic system or a scan tool. 3. Check the IAT 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 IAT 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 G549822t73.

G549822t73 : CHECK THE IAT SENSOR RETURN CIRCUIT FOR HIGH
RESISTANCE

1. Key off. 2. Disconnect the MAF1 sensor connector, EC67. 3. Key on, engine off. 4. Measure the

resistance between:

EC67, harness side

Battery

Pin 03

Negative terminal

Is the resistance less than 10 ohms?

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