Jaguar XJ (X350). Service 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.
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