Jaguar XJ (X350). Manual — part 679

G552275t11 : CHECK WHETHER THE SHORT CIRCUIT TO GROUND 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:

C42, harness side

Battery

Pin 02

Negative terminal

Is the resistance greater than 100 Kohms?

-> Yes

Harness is OK. Suspect: - ECM

-> No

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

the system for normal operation.

G552275t12 : 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:

C42, harness side

Battery

Pin 02

Positive terminal

Is the resistance greater than 100 Kohms?

-> Yes

Harness is OK. Suspect: - 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 G552275p6 : FUEL
RAIL PRESSURE (FRP) SENSOR AND
CIRCUIT

G552275t13 : CHECK THE FRP SENSOR RETURN CIRCUIT

1.

Circuit

Pin

Signal from ECM

01

Ground from ECM 02

Power from ECM

03

2.

Circuit

Pin

FRP sensor - signal

D1

FRP sensor - ground E2

FRP sensor - power

D2

3. Key off. 4. Disconnect the FRP sensor connector, C30. 5. Key on, engine off. 6. Measure the

resistance between:

C30, harness side

Battery

Pin 02

Negative terminal

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Is the resistance less than 10 ohms?

-> Yes

GO to Pinpoint Test G552275t14.

-> No

GO to Pinpoint Test G552275t26.

G552275t14 : CHECK THE POWER SUPPLY TO THE FRP

1. Measure the voltage between:

C30, harness side

Battery

Pin 03

Negative terminal

Is the voltage between 4.8 and 5.2 volts?

-> Yes

GO to Pinpoint Test G552275t15.

-> No

GO to Pinpoint Test G552275t23.

G552275t15 : CHECK THE FRP SIGNAL CIRCUIT FOR SHORT CIRCUIT TO
GROUND

1. Measure the resistance between:

C30, harness side

Battery

Pin 01

Negative terminal

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G552275t16.

-> No

GO to Pinpoint Test G552275t19.

G552275t16 : CHECK THE FRP SIGNAL CIRCUIT FOR SHORT CIRCUIT TO
POWER

1. Measure the resistance between:

C30, harness side

Battery

Pin 01

Positive terminal

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G552275t17.

-> No

GO to Pinpoint Test G552275t21.

G552275t17 : CHECK THE FRP SIGNAL CIRCUIT FOR SHORT CIRCUIT TO
SENSOR POWER

1. Measure the resistance between:

C30, harness side C30, harness side

Pin 01

Pin 03

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G552275t18.

-> No

GO to Pinpoint Test G552275t22.

G552275t18 : CHECK THE FRP SIGNAL CIRCUIT FOR HIGH RESISTANCE

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

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