Jaguar XJ (X350). Manual — part 1022

G549822t266 : CHECK THE RADIATOR COOLING FAN MODULE CONTROL
CIRCUIT FOR SHORT CIRCUIT TO GROUND

1. Measure the resistance between:

GC01, harness side

Battery

Pin 01

Negative terminal

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G549822t267.

-> No

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

the system for normal operation.

G549822t267 : CHECK THE RADIATOR COOLING FAN MODULE CONTROL
CIRCUIT FOR SHORT CIRCUIT TO POWER

1. Measure the resistance between:

GC01, harness side

Battery

Pin 01

Positive terminal

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G549822t268.

-> No

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

the system for normal operation.

G549822t268 : CHECK THE RADIATOR COOLING FAN MODULE CONTROL
CIRCUIT FOR HIGH RESISTANCE

1. Key off. 2. Disconnect the ECM connector, EC66. 3. Key on, engine off. 4. Measure the resistance

between:

GC01, harness side EC66, harness side

Pin 01

Pin K2

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): - Radiator cooling fan module connector(s) - Radiator cooling fan module - 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 G549822p22 :
STARTER RELAY AND CIRCUITS

G549822t261 : CHECK THE STARTER RELAY AND CIRCUITS

1.

Starting System

-> Yes

-> No

PINPOINT TEST G549822p23 : ECM
POWER SUPPLY CIRCUIT

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G549822t269 : CHECK FOR POWER TO THE ECM

1.

Circuit

Pin

ECM - power K4

2. Key off. 3. Disconnect the ECM electrical connector, EC66. 4. Measure the voltage between:

EC66, harness side

Battery

Pin K4

Negative terminal

Is the voltage greater than 10 volts?

-> Yes

Recheck the DTCs. If no DTCs are set 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): - ECM connector - ECM

-> 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.

PINPOINT TEST G549822p20 : ECM
IGNITION SUPPLY CIRCUIT(S)

G549822t257 : CHECK THE IGNITION TO ECM SUPPLY CIRCUITS

1.

Circuit

Pin

ECM - ignition supply A L2

ECM - ignition supply B L3

ECM - ignition supply C L1

2. Key off. 3. Disconnect the ECM electrical connector, EC66. 4. Measure the voltage between:

EC66, harness side

Battery

Pin L2

Negative terminal

Pin L3

Negative terminal

Pin L1

Negative terminal

Are the voltages greater than 10 volts?

-> Yes

Recheck the DTCs. If no DTCs are set 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): - ECM connector - ECM

-> No

REPAIR the ignition power supply circuit(s) as necessary. For additional information, refer to the

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

PINPOINT TEST G549822p26 : EMS
CONTROL RELAY

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