Jaguar XJ (X350). Manual — part 866

G531330t32 : CHECK THE CATALYST MONITOR HEATER CONTROL 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 02

Pin 88

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. If the

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

PINPOINT TEST G531330p10 : LEFT-
HAND H02S VARIABLE AND
CONSTANT CIRCUITS

G531330t35 : CHECK THE H02S VARIABLE CIRCUIT FOR SHORT CIRCUIT TO
GROUND

1. Disconnect the H02S electrical connector, PI12. 2. Measure the resistance between:

H02S connector PI12, 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 G531330t34.

G531330t34 : CHECK THE H02S VARIABLE CIRCUIT FOR SHORT TO CIRCUIT
TO POWER

1. Measure the resistance between:

H02S connector PI12, 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 G531330t38.

G531330t38 : CHECK THE H02S CONSTANT CIRCUIT FOR SHORT CIRCUIT
TO GROUND

1. Measure the resistance between:

H02S connector PI12, harness side

Battery

Pin 03

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 G531330t37.

G531330t37 : CHECK THE H02S CONSTANT CIRCUIT FOR SHORT TO
CIRCUIT TO POWER

1. Measure the resistance between:

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H02S connector PI12, harness side

Battery

Pin 03

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 G531330t33.

G531330t33 : CHECK THE H02S VARIABLE CIRCUIT 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 04

Pin 26

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 G531330t36.

G531330t36 : CHECK THE H02S CONSTANT CIRCUIT FOR HIGH RESISTANCE

1. Measure the resistance between:

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

Pin 03

Pin 27

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 G531330p11 : LEFT-
HAND H02S HEATER SUPPLY AND
CONTROL CIRCUITS

G531330t39 : CHECK H02S HEATER POWER SUPPLY CIRCUIT

1. Disconnect the H02S electrical connector, PI12. 2. Key on, engine off. 3. Measure the voltage

between:

H02S connector PI12, harness side

Battery

Pin 01

Negative terminal

Is the voltage greater than 10 volts?

-> Yes

GO to Pinpoint Test G531330t42.

-> No

REPAIR the power supply circuit to the H02S 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.

G531330t42 : CHECK H02S HEATER CONTROL CIRCUIT FROM ECM FOR
SHORT CIRCUIT TO GROUND

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

H02S connector PI12, harness side

Battery

Pin 02

Negative terminal

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