Jaguar XJ (X350). Manual — part 1021

-> 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): - A/C pressure sensor connector - A/C pressure 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.

G549822t256 : CHECK FOR POWER TO THE A/C PRESSURE SENSOR

1. Key on, engine off. 2. Measure the voltage between:

EC101, harness side

Battery

Pin 03

Negative terminal

Is the voltage between 4.8 - 5.2 volts?

-> Yes

GO to Pinpoint Test G549822t252.

-> No

REPAIR the power supply circuit as necessary. For additional information, refer to the wiring

diagrams. Clear any DTCs, test the system for normal operation.

G549822t252 : CHECK THE A/C PRESSURE SENSOR SIGNAL CIRCUIT FOR
SHORT CIRCUIT TO GROUND

1. Measure the resistance between:

EC101, harness side

Battery

Pin 02

Negative terminal

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G549822t251.

-> No

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

the system for normal operation.

G549822t251 : CHECK THE A/C PRESSURE SENSOR SIGNAL CIRCUIT FOR
SHORT CIRCUIT TO POWER

1. Measure the resistance between:

EC101, harness side

Battery

Pin 02

Positive terminal

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G549822t250.

-> No

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

the system for normal operation.

G549822t250 : CHECK THE A/C PRESSURE SENSOR SIGNAL CIRCUIT FOR
HIGH RESISTANCE

1. Key off. 2. Disconnect the ECM connector, EC66. 3. Measure the resistance between:

A/C pressure sensor connector EC101, harness side ECM connector EC66, harness side

Pin 02

Pin F2

Is the resistance 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): - A/C pressure sensor connector - A/C pressure 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.

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PINPOINT TEST G549822p21 :
RADIATOR COOLING FAN

G549822t263 : CHECK THE RADIATOR COOLING FAN MODULE GROUND
CIRCUIT FOR HIGH RESISTANCE

1. Radiator cooling fan connector, EC72

Circuit

Pin

Radiator cooling fan - power

01

Radiator cooling fan - ground 02

2. Radiator cooling fan connector, GC01

Circuit

Pin

Radiator cooling fan - control 01

Radiator cooling fan - ignition 02

3. Engine control module (ECM) connector, EC66

Circuit

Pin

Radiator cooling fan - control K2

4. Key off. 5. Disconnect the fan module electrical connector, EC72. 6. Measure the resistance

between:

EC72, harness side

Battery

Pin 02

Negative terminal

Is the resistance less than 10 ohms?

-> Yes

GO to Pinpoint Test G549822t264.

-> No

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

DTCs, test the system for normal operation.

G549822t264 : CHECK FOR POWER TO THE RADIATOR COOLING FAN
MODULE

1. Measure the voltage between:

EC72, harness side

Battery

Pin 01

Negative terminal

Is the voltage greater than 10 volts?

-> Yes

GO to Pinpoint Test G549822t265.

-> No

REPAIR the power supply circuit as necessary. For additional information, refer to the wiring

diagrams. Clear any DTCs, test the system for normal operation.

G549822t265 : CHECK THE IGNITION SUPPLY TO THE RADIATOR COOLING
FAN MODULE

1. Key off. 2. Disconnect the fan module electrical connector, GC01. 3. Key on, engine off. 4. Measure

the voltage between:

GC01, harness side

Battery

Pin 02

Negative terminal

Is the voltage greater than 10 volts?

-> Yes

GO to Pinpoint Test G549822t266.

-> No

REPAIR the EMS relay to radiator cooling fan supply circuit as necessary. For additional information,

refer to the wiring diagrams. Clear any DTCs, test the system for normal operation.

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