Jaguar XJ (X350). Manual — part 867

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 G531330t41.

G531330t41 : CHECK H02S HEATER CONTROL CIRCUIT FROM ECM FOR
SHORT CIRCUIT TO POWER

1. Measure the resistance between:

H02S connector PI12, 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 G531330t40.

G531330t40 : CHECK H02S HEATER CONTROL CIRCUIT FROM ECM FOR
HIGH RESISTANCE

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

H02S connector PI12, harness side ECM connector PI300, harness side

Pin 02

Pin 77

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. If the DTC is

repeated, refer to the warranty policy and procedures manual if an ECM is suspect.

PINPOINT TEST G531330p14 : LEFT-
HAND CATALYST MONITOR SENSOR
SENSING AND GROUND CIRCUITS

G531330t51 : CHECK THE CATALYST MONITOR SENSOR SENSING CIRCUIT
FOR SHORT CIRCUIT TO GROUND

1. Disconnect the catalyst monitor electrical connector, PI13. 2. Measure the resistance between:

Catalyst monitor connector PI13, 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 G531330t50.

G531330t50 : CHECK THE CATALYST MONITOR SENSOR SENSING CIRCUIT
FOR SHORT CIRCUIT TO POWER

1. Measure the resistance between:

Catalyst monitor connector PI13, 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.

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-> No

GO to Pinpoint Test G531330t49.

G531330t49 : 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 PI13, harness side ECM connector PI300, harness side

Pin 04

Pin 41

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

GO to Pinpoint Test G531330t52.

G531330t52 : CHECK THE CATALYST MONITOR SENSOR GROUND CIRCUIT
FOR HIGH RESISTANCE

1. Measure the resistance between:

Catalyst monitor connector PI13, harness side ECM connector PI300, harness side

Pin 03

Pin 45

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 G531330p12 : LEFT-
HAND CATALYST MONITOR SENSOR
SUPPLY AND HEATER CONTROL
CIRCUITS

G531330t43 : CHECK THE CATALYST MONITOR HEATER POWER SUPPLY
CIRCUIT

1. Disconnect the catalyst monitor sensor electrical connector, PI13. 2. Key on, engine off. 3. Make

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

Catalyst monitor connector PI13, harness side

Battery

Pin 01

Negative terminal

Is the voltage greater than 10 volts?

-> Yes

GO to Pinpoint Test G531330t172.

-> No

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

relay and fuse 34 of the front power distribution box. For additional information, refer to the wiring

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

G531330t172 : CHECK THE CATALYST MONITOR HEATER CONTROL
CIRCUIT FOR SHORT CIRCUIT TO GROUND

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

Catalyst monitor connector PI13, 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.

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