Jaguar XJ (X350). Manual — part 681

G552275t27 : CHECK FOR 5 VOLT SUPPLY AND SIGNAL RETURN CIRCUITS
SHORT CIRCUIT TO EACH OTHER

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

between:

C30, harness side C30, harness side

Pin 03

Pin 02

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G552275t28.

-> No

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

the system for normal operation.

G552275t28 : CHECK THE FRP SENSOR RETURN CIRCUIT FOR HIGH
RESISTANCE

1. Measure the resistance between:

C30, harness side C100, harness side

Pin 02

Pin E2

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

DTCs, test the system for normal operation.

G552275t29 : CHECK FOR 5 VOLT SUPPLY AND SIGNAL RETURN CIRCUITS
SHORT CIRCUIT TO EACH OTHER

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

C30, harness side C30, harness side

Pin 03

Pin 02

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G552275t30.

-> No

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

the system for normal operation.

G552275t30 : CHECK WHETHER THE SHORT CIRCUIT TO GROUND IS IN THE
HARNESS OR THE MODULE

1. Measure the resistance between:

C30, harness side

Battery

Pin 03

Negative 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.

G552275t31 : 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:

C30, harness side

Battery

Pin 03

Positive terminal

www.

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.

G552275t32 : 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:

C30, 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.

PINPOINT TEST G552275p7 : FUEL
PRESSURE CONTROL VALVE (FPCV)
AND CIRCUIT

G552275t33 : CHECK THE POWER SUPPLY TO THE FPCV

1.

Circuit

Pin

Power

01

Signal from ECM 02

2.

Circuit

Pin

Fuel pressure control valve - signal K3

3. Key off. 4. Disconnect the FPCV connector, C43. 5. Key on, engine off. 6. Measure the voltage

between:

C43, harness side

Battery

Pin 01

Negative terminal

Is the voltage between 9 and 15 volts?

-> Yes

GO to Pinpoint Test G552275t34.

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