Jaguar XJ (X350). Manual — part 793

-> 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): - Intake air shutoff throttle connector - ECM connector - Intake air shutoff throttle -

ECM

-> No

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

DTCs, test the system for normal operation.

G552800t7 : CHECK THE SIGNAL AND RETURN CIRCUITS FOR SHORT
CIRCUIT TO EACH OTHER

1. Measure the resistance between:

C39, harness side C39, harness side

Pin 02

Pin 01

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G552800t8.

-> No

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

the system for normal operation.

G552800t8 : CHECK WHETHER THE SHORT CIRCUIT IS IN THE HARNESS OR
THE MODULE

1. Key off. 2. Disconnect the ECM connector, C100. 3. Key on, engine off. 4. Measure the resistance

between:

C39, harness side C39, harness side

Pin 02

Pin 01

Is the resistance greater than 100 Kohms?

-> 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): - ECM

-> No

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

the system for normal operation.

G552800t9 : CHECK WHETHER THE SHORT CIRCUIT TO POWER IS IN THE
HARNESS OR THE MODULE

1. Key off. 2. Disconnect the ECM connector, C100. 3. Key on, engine off. 4. Measure the resistance

between:

C39, harness side

Battery

Pin 02

Positive terminal

Is the resistance greater than 100 Kohms?

-> 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): - ECM

-> No

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

the system for normal operation.

G552800t10 : CHECK WHETHER THE SHORT CIRCUIT IS IN THE HARNESS
OR THE MODULE

1. Key off. 2. Disconnect the ECM connector, C100. 3. Key on, engine off. 4. Measure the resistance

between:

C39, harness side C39, harness side

Pin 02

Pin 06

Is the resistance greater than 100 Kohms?

-> 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): - ECM

www.

-> No

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

the system for normal operation.

G552800t11 : CHECK THE SUPPLY CIRCUIT FOR SHORT CIRCUIT TO
GROUND

1. Measure the resistance between:

C39, harness side

Battery

Pin 06

Negative terminal

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G552800t12.

-> No

GO to Pinpoint Test G552800t17.

G552800t12 : CHECK THE SUPPLY CIRCUIT FOR SHORT CIRCUIT TO POWER

1. Measure the resistance between:

C39, harness side

Battery

Pin 02

Positive terminal

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G552800t13.

-> No

GO to Pinpoint Test G552800t19.

G552800t13 : CHECK THE INTAKE AIR SHUTOFF THROTTLE SUPPLY
CIRCUIT FOR HIGH RESISTANCE

1. Key off. 2. Disconnect the ECM connector, C100. 3. Measure the resistance between:

C39, harness side C100, harness side

Pin 06

Pin F1

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): - ECM connector - ECM

-> No

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

test the system for normal operation.

G552800t14 : CHECK THE INTAKE AIR SHUTOFF THROTTLE RETURN
CIRCUIT FOR SHORT CIRCUIT TO POWER

1. Measure the resistance between:

C39, harness side

Battery

Pin 01

Positive terminal

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G552800t15.

-> No

GO to Pinpoint Test G552800t20.

G552800t15 : CHECK THE SIGNAL AND RETURN CIRCUITS FOR SHORT
CIRCUIT TO EACH OTHER

1. Key off. 2. Disconnec the ECM connector, C100. 3. Key on, engine off. 4. Measure the resistance

between:

C39, harness side C39, harness side

Pin 06

Pin 01

www.