Jaguar XJ (X350). Service 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.
www.
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