Jaguar XJ (X350). Manual — part 762

circuit to power

Ignition module/coils left hand

bank ground circuit fault

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.

NOTE:

When performing electrical 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.

PINPOINT TEST G531328p1 : IGNITION
COIL CIRCUITS

G531328t2 : CHECK THE IGNITION COIL SUPPLY VOLTAGE CIRCUIT

1. Disconnect the relevant ignition coil electrical connector:

Ignition coil connector

Cylinder 1, PI02

Cylinder 2, PI06

Cylinder 3, PI03

Cylinder 4, PI07

Cylinder 5, PI04

Cylinder 6, PI08

Cylinder 7, PI05

Cylinder 8, PI09

2. Key on, engine off. 3. Make sure the ignition relay is energized. 4. Measure the voltage between:

Ignition coil connector, harness side

Battery

Pin 01

Negative terminal

Is the voltage less than 10.5 Volts?

-> Yes

REPAIR the relevant ignition coil supply circuit. This circuit includes fuse 30 of the front power

distribution box and the ignition relay. For additional information, refer to the wiring diagrams.

CLEAR the DTCs and test the system for normal operation.

-> No

GO to Pinpoint Test G531328t12.

G531328t12 : CHECK THE IGNITION COIL SWITCHING CIRCUITS FOR SHORT
CIRCUIT TO GROUND

1. Key off. 2. Measure the resistance between:

Ignition coil connector, harness side

Battery

Pin 04

Negative terminal

Is the resistance less than 10,000 ohms?

-> Yes

REPAIR the short circuit. For additional information, refer to the wiring diagrams. CLEAR the DTCs

and test the system for normal operation.

-> No

GO to Pinpoint Test G531328t13.

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G531328t13 : CHECK THE IGNITION COIL SWITCHING CIRCUITS FOR SHORT
CIRCUIT TO POWER

1. Measure the resistance between:

Ignition coil connector, harness side

Battery

Pin 04

Positive terminal

Is the resistance less than 10,000 ohms?

-> Yes

REPAIR the short circuit. For additional information, refer to the wiring diagrams. CLEAR the DTCs

and test the system for normal operation.

-> No

GO to Pinpoint Test G531328t4.

G531328t4 : CHECK THE IGNITION COIL MONITOR CIRCUITS FOR SHORT
CIRCUIT TO GROUND

1. Measure the resistance between:

Ignition coil connector, harness side

Battery

Pin 02

Negative terminal

Is the resistance less than 10,000 ohms?

-> Yes

REPAIR the short circuit. For additional information, refer to the wiring diagrams. CLEAR the DTCs

and test the system for normal operation.

-> No

GO to Pinpoint Test G531328t5.

G531328t5 : CHECK THE IGNITION COIL MONITOR CIRCUITS FOR SHORT
CIRCUIT TO POWER

1. Measure the resistance between:

Ignition coil connector, harness side

Battery

Pin 02

Positive terminal

Is the resistance less than 10,000 ohms?

-> Yes

REPAIR the short circuit. For additional information, refer to the wiring diagrams. CLEAR the DTCs

and test the system for normal operation.

-> No

GO to Pinpoint Test G531328t3.

G531328t3 : CHECK THE IGNITION COIL GROUND CIRCUIT FOR HIGH
RESISTANCE

1. Measure the resistance between:

Cylinder 1 ignition coil connector, harness side

Battery

PI02, pin 03

Negative terminal

Cylinder 2 ignition coil connector, harness side

Battery

PI06, pin 03

Negative terminal

Cylinder 3 ignition coil connector, harness side

Battery

PI03, pin 03

Negative terminal

Cylinder 4 ignition coil connector, harness side

Battery

PI07, pin 03

Negative terminal

Cylinder 5 ignition coil connector, harness side

Battery

PI04, pin 03

Negative terminal

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