Jaguar XJ (X350). Manual — part 865

-> Yes

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

test the system for normal operation.

-> No

GO to Pinpoint Test G531330t24.

G531330t24 : CHECK H02S HEATER CONTROL CIRCUIT FROM ECM FOR
HIGH RESISTANCE

1. Disconnect the ECM electrical connector, PI300. 2. Measure the resistance between:

H02S connector PI10, harness side ECM connector PI300, harness side

Pin 02

Pin 76

Is the resistance greater than 5 ohms?

-> Yes

REPAIR the high resistance circuit. For additional information, refer to the wiring diagrams. CLEAR the

DTC and test the system for normal operation.

-> No

INSTALL a new H02S.

Heated Oxygen Sensor (HO2S) CLEAR the DTC and test the system for normal operation.

PINPOINT TEST G531330p8 : RIGHT-
HAND CATALYST MONITOR SENSOR
SENSING AND GROUND CIRCUITS

G531330t29 : CHECK THE CATALYST MONITOR SENSOR SENSING CIRCUIT
FOR SHORT CIRCUIT TO GROUND

1. Disconnect the catalyst monitor electrical connector, PI11. 2. Measure the resistance between:

Catalyst monitor connector PI11, 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 DTC and

test the system for normal operation.

-> No

GO to Pinpoint Test G531330t28.

G531330t28 : CHECK THE CATALYST MONITOR SENSOR SENSING CIRCUIT
FOR SHORT CIRCUIT TO POWER

1. Measure the resistance between:

Catalyst monitor connector PI11, 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 DTC and

test the system for normal operation.

-> No

GO to Pinpoint Test G531330t27.

G531330t27 : CHECK THE CATALYST MONITOR SENSOR SENSING CIRCUIT
FOR HIGH RESISTANCE

1. Disconnect the ECM electrical connector, PI300. 2. Measure the resistance between:

Catalyst monitor connector PI11, harness side ECM connector PI300, harness side

Pin 04

Pin 40

Is the resistance greater than 5 ohms?

-> Yes

REPAIR the high resistance circuit. For additional information, refer to the wiring diagrams. CLEAR the

DTC and test the system for normal operation.

-> No

www.

GO to Pinpoint Test G531330t30.

G531330t30 : CHECK THE CATALYST MONITOR SENSOR GROUND CIRCUIT
FOR HIGH RESISTANCE

1. Measure the resistance between:

Catalyst monitor connector PI11, harness side ECM connector PI300, harness side

Pin 03

Pin 22

Is the resistance greater than 5 ohms?

-> Yes

REPAIR the high resistance circuit. For additional information, refer to the wiring diagrams. CLEAR the

DTC and test the system for normal operation.

-> No

INSTALL a new catalyst monitor sensor.

Catalyst Monitor Sensor (18.30.66) CLEAR the DTC and test the system for normal operation.

PINPOINT TEST G531330p9 : RIGHT-
HAND CATALYST MONITOR SENSOR
SUPPLY AND HEATER CONTROL
CIRCUITS

G531330t31 : CHECK THE CATALYST MONITOR HEATER POWER SUPPLY
CIRCUIT

1. Disconnect the catalyst monitor sensor electrical connector, PI11. 2. Key on, engine off. 3. Make

sure the O2S heater relay is energized. 4. Measure the voltage between:

Catalyst monitor connector PI11, harness side

Battery

Pin 01

Negative terminal

Is the voltage greater than 10 volts?

-> Yes

GO to Pinpoint Test G531330t170.

-> No

REPAIR the power supply circuit to the catalyst monitor heater. This circuit includes the O2S heater

relay and fuse 33 of the front power distribution box. For additional information, refer to the wiring

diagrams. CLEAR the DTC and test the system for normal operation.

G531330t170 : CHECK THE CATALYST MONITOR HEATER CONTROL
CIRCUIT FOR SHORT CIRCUIT TO GROUND

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

Catalyst monitor connector PI11, 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 DTC and

test the system for normal operation.

-> No

GO to Pinpoint Test G531330t171.

G531330t171 : CHECK THE CATALYST MONITOR HEATER CONTROL
CIRCUIT FOR SHORT CIRCUIT TO POWER

1. Measure the resistance between:

Catalyst monitor connector PI11, 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 DTC and

test the system for normal operation.

-> No

GO to Pinpoint Test G531330t32.

www.