Jaguar XJ (X350). Manual — part 1023

G549822t258 : CHECK THE EMS RELAY CONTROL CIRCUIT FOR SHORT
CIRCUIT TO GROUND

1.

Circuit

Pin

EMS relay - control J3

2. Remove the EMS relay. 3. Measure the resistance between:

EMS relay base

Battery

Pin 02

Negative terminal

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G549822t259.

-> No

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

the system for normal operation.

G549822t259 : CHECK THE EMS RELAY CONTROL CIRCUIT FOR SHORT
CIRCUIT TO POWER

1. Measure the resistance between:

EMS relay base

Battery

Pin 02

Positive terminal

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G549822t277.

-> No

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

the system for normal operation.

G549822t277 : CHECK THE EMS RELAY CONTROL CIRCUIT FOR HIGH
RESISTANCE

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

EMS relay base EC66

Pin 02

Pin J3

Is the resistance less than 10 ohms?

-> Yes

GO to Pinpoint Test G549822t278.

-> No

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

DTCs, test the system for normal operation.

G549822t278 : CHECK FOR POWER TO THE EMS RELAY BASE

1. Measure the voltage between:

EMS relay base

Battery

Pin 01

Negative terminal

Pin 03

Negative terminal

Are the voltages greater than 10 volts?

-> 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): - EMS relay - ECM connector - ECM

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-> No

REPAIR the circuit between the battery and the EMS relay base as necessary. For additional

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

PINPOINT TEST G549822p25 : INERTIA
SWITCH

G549822t270 : CHECK THE INERTIA SWITCH SUPPLY CIRCUIT FOR SHORT
CIRCUIT TO GROUND

1. Make sure the inertia switch is not tripped. 2. Key off. 3. Disconnect the inertia switch connector,

CR02. 4. Measure the resistance between:

CR02, harness side

Battery

Pin 02

Negative terminal

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G549822t271.

-> No

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

the system for normal operation.

G549822t271 : CHECK THE INERTIA SWITCH SUPPLY CIRCUIT FOR SHORT
CIRCUIT TO POWER

1. Measure the resistance between:

CR02, harness side

Battery

Pin 02

Positive terminal

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G549822t272.

-> No

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

the system for normal operation.

G549822t272 : CHECK THE INERTIA SWITCH SUPPLY CIRCUIT FOR HIGH
RESISTANCE

1. Disconnect the ignition switch connector, IP34. 2. Measure the resistance between:

CR02, harness side IP34

Pin 02

Pin 07

Is the resistance less than 10 ohms?

-> Yes

GO to Pinpoint Test G549822t279.

-> No

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

DTCs, test the system for normal operation.

G549822t279 : CHECK THE INERTIA SWITCH TO ECM CIRCUIT FOR SHORT
CIRCUIT TO GROUND

1. Measure the resistance between:

CR02, harness side

Battery

Pin 03

Negative terminal

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G549822t273.

-> No

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

the system for normal operation.

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