Jaguar XJ (X350). Manual — part 792

Pinpoint Tests

CAUTION: When probing connectors to take measurements in the course of the pinpoint

tests, use the adaptor kit, part number 3548-1358-00. Failure to follow this instruction may result

in damage to the vehicle.

NOTE:

When performing voltage or resistance tests, always use a digital multimeter (DMM) accurate to

3 decimal places, and with an up-to-date calibration certificate. When testing resistance, always

take the resistance of the DMM leads into account.

NOTE:

Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.

NOTE:

If DTCs are recorded and a fault is not present when performing the pinpoint tests, an

intermittent concern may be the cause. Always check for loose connections and corroded

terminals.

PINPOINT TEST G552800p1 : INTAKE
AIR SHUTOFF THROTTLE ACTUATOR

G552800t1 : CHECK THE INTAKE AIR SHUTOFF THROTTLE SENSOR RETURN
CIRCUIT

1.

Circuit

Pin

Signal from ECM

02

Ground from ECM 01

Power from ECM

06

2.

Circuit

Pin

Intake air throttle - signal

E1

Intake air throttle - ground F2

Intake air throttle - power

F1

3. Key off. 4. Disconnect the intake air throttle connector, C39. 5. Key on, engine off. 6. Measure the

resistance between:

C39, harness side

Battery

Pin 01

Negative terminal

Is the resistance less than 10 ohms?

-> Yes

GO to Pinpoint Test G552800t2.

-> No

GO to Pinpoint Test G552800t14.

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G552800t2 : CHECK THE POWER SUPPLY TO THE INTAKE AIR SHUTOFF
THROTTLE

1. Measure the voltage between:

C39, harness side

Battery

Pin 06

Negative terminal

Is the voltage between 4.8 and 5.2 volts?

-> Yes

GO to Pinpoint Test G552800t3.

-> No

GO to Pinpoint Test G552800t11.

G552800t3 : CHECK THE INTAKE AIR SHUTOFF THROTTLE SIGNAL CIRCUIT
FOR SHORT CIRCUIT TO GROUND

1. Measure the resistance between:

C39, harness side

Battery

Pin 02

Negative terminal

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G552800t4.

-> No

GO to Pinpoint Test G552800t7.

G552800t4 : CHECK THE INTAKE AIR SHUTOFF THROTTLE SIGNAL 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 G552800t5.

-> No

GO to Pinpoint Test G552800t9.

G552800t5 : CHECK THE INTAKE AIR SHUTOFF THROTTLE SIGNAL CIRCUIT
FOR SHORT CIRCUIT TO SENSOR POWER

1. Measure the resistance between:

C39, harness side C39, harness side

Pin 02

Pin 06

Is the resistance greater than 100 Kohms?

-> Yes

GO to Pinpoint Test G552800t6.

-> No

GO to Pinpoint Test G552800t10.

G552800t6 : CHECK THE INTAKE AIR SHUTOFF THROTTLE SIGNAL 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 02

Pin E1

Is the resistance less than 10 ohms?

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