Jaguar XJ (X350). Service 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.
www.
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?
www.
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