Jaguar XJ (X350). Service 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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